2016
Berry, Eric A.
A Spatially Variant Metamaterial Design Process for Transformation Electromangetic Devices PhD Thesis
2016.
Abstract | Links | BibTeX | Tags:
@phdthesis{RN182,
title = {A Spatially Variant Metamaterial Design Process for Transformation Electromangetic Devices},
author = {Eric A. Berry},
url = {https://scholarworks.utep.edu/open_etd/607/},
year = {2016},
date = {2016-12-12},
abstract = {A technique for the implementation of devices designed using transformation optics (TO) is presented using metamaterial elements arranged using spatially variant lattices. A description of transformation optics, including the design of arbitrarily shaped devices by solving Laplace's equation numerically, is discussed. Analysis of a variety of metamaterial unit cells using frequency sweeps of the unit cells with the resulting permittivity and permeability values. Metamaterial unit cells are also analyzed by the scaling of all the features of the metamaterial elements in the unit cell and calculating the permittivity and permeability. Finite- difference time domain (FDTD) and finite-difference frequency domain (FDFD) methods are described including the simulation of anisotropic structures using FDFD. An arbitrary electromagnetic cloak is given as an example device and is designed using the methods presented within to demonstrate the toolchain.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
A technique for the implementation of devices designed using transformation optics (TO) is presented using metamaterial elements arranged using spatially variant lattices. A description of transformation optics, including the design of arbitrarily shaped devices by solving Laplace's equation numerically, is discussed. Analysis of a variety of metamaterial unit cells using frequency sweeps of the unit cells with the resulting permittivity and permeability values. Metamaterial unit cells are also analyzed by the scaling of all the features of the metamaterial elements in the unit cell and calculating the permittivity and permeability. Finite- difference time domain (FDTD) and finite-difference frequency domain (FDFD) methods are described including the simulation of anisotropic structures using FDFD. An arbitrary electromagnetic cloak is given as an example device and is designed using the methods presented within to demonstrate the toolchain.
Tsang, Harvey Hing-Cheong
Digital processes and characterization for fabricating 3D RF devices PhD Thesis
2016, (989774427 by Harvey Hing-Cheong Tsang. illustrations (mostly color) ; 4 3/4 inches. Vita. Includes bibliographical references. Also available online via ProQuest Dissertations and Theses @ UTEP CD-ROM requires Adobe Acrobat Reader and CD-ROM drive. University of Texas at El Paso. Doctoral dissertation.).
@phdthesis{RN171,
title = {Digital processes and characterization for fabricating 3D RF devices},
author = {Harvey Hing-Cheong Tsang},
url = {https://digitalcommons.utep.edu/open_etd/769},
year = {2016},
date = {2016-12-01},
urldate = {2016-12-01},
note = {989774427
by Harvey Hing-Cheong Tsang.
illustrations (mostly color) ; 4 3/4 inches.
Vita.
Includes bibliographical references. Also available online via ProQuest Dissertations and Theses @ UTEP
CD-ROM requires Adobe Acrobat Reader and CD-ROM drive.
University of Texas at El Paso. Doctoral dissertation.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
Gulib, Asad Ullah Hil
Numerical calculation of spatially variant anisotropic metamaterials Masters Thesis
2016, (983795860 by Asad Ullah Hil Gulib. illustrations (mostly color) ; 4 3/4 inches. Vita. Includes bibliographical references. Also available online via ProQuest Dissertations and Theses @ UTEP CD-ROM requires Adobe Acrobat Reader and CD-ROM drive. University of Texas at El Paso. Master's thesis.).
Links | BibTeX | Tags: 3D printing, additives manufacturing, anisotropy, composite materials, electromagnetic testing, manufacturing processes, metamaterials
@mastersthesis{RN181,
title = {Numerical calculation of spatially variant anisotropic metamaterials},
author = {Asad Ullah Hil Gulib},
url = {https://digitalcommons.utep.edu/open_etd/657},
year = {2016},
date = {2016-12-01},
urldate = {2016-12-01},
pages = {1 computer disc (x, 42 pages)},
note = {983795860
by Asad Ullah Hil Gulib.
illustrations (mostly color) ; 4 3/4 inches.
Vita.
Includes bibliographical references. Also available online via ProQuest Dissertations and Theses @ UTEP
CD-ROM requires Adobe Acrobat Reader and CD-ROM drive.
University of Texas at El Paso. Master's thesis.},
keywords = {3D printing, additives manufacturing, anisotropy, composite materials, electromagnetic testing, manufacturing processes, metamaterials},
pubstate = {published},
tppubtype = {mastersthesis}
}
Freymann, Georg; Schoenfeld, Winston V; Rumpf, Raymond C
Advanced Fabrication Technologies for Micro/Nano Optics and Photonics IX Proceedings
vol. 9759, 2016, ISSN: 1628419946.
BibTeX | Tags:
@proceedings{RN126,
title = {Advanced Fabrication Technologies for Micro/Nano Optics and Photonics IX},
author = {Georg Freymann and Winston V Schoenfeld and Raymond C Rumpf},
issn = {1628419946},
year = {2016},
date = {2016-07-01},
journal = {Advanced Fabrication Technologies for Micro/Nano Optics and Photonics IX},
volume = {9759},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
Rumpf, Raymond; Church, Kenneth
HBCU/MI: 3D Formable RF Materials and Devices Technical Report
University of Texas at El Paso El Paso United States 2016.
Abstract | Links | BibTeX | Tags:
@techreport{RN129,
title = {HBCU/MI: 3D Formable RF Materials and Devices},
author = {Raymond Rumpf and Kenneth Church},
url = {https://apps.dtic.mil/sti/citations/AD1037354},
year = {2016},
date = {2016-06-01},
institution = {University of Texas at El Paso El Paso United States},
abstract = {The aim of this project was to explore 3D printing for RFmicrowave circuits and devices. The research produced several 3D printed microwave filters, a 3D wifi radio circuit, and new materials for 3D printed electromagnetic devices. The research demonstrates that 3D printing is capable of manufacturing circuits and high-frequency microwave systems. Future work in this area should explore ways that the third dimension can be exploited to reduce size, weight, and power and how it can be used to incorporate physics that is not possible in three dimensions.},
keywords = {},
pubstate = {published},
tppubtype = {techreport}
}
The aim of this project was to explore 3D printing for RFmicrowave circuits and devices. The research produced several 3D printed microwave filters, a 3D wifi radio circuit, and new materials for 3D printed electromagnetic devices. The research demonstrates that 3D printing is capable of manufacturing circuits and high-frequency microwave systems. Future work in this area should explore ways that the third dimension can be exploited to reduce size, weight, and power and how it can be used to incorporate physics that is not possible in three dimensions.
Rodriguez, Carlos; Avila, Jose; Rumpf, Raymond C
Ultra-thin 3D printed all-dielectric antenna Journal Article
In: Progress In Electromagnetics Research C, vol. 64, pp. 117-123, 2016, ISSN: 1937-8718.
Abstract | Links | BibTeX | Tags: 3D printing, all-dielectric antenna, hybrid 3D printing
@article{RN109,
title = {Ultra-thin 3D printed all-dielectric antenna},
author = {Carlos Rodriguez and Jose Avila and Raymond C Rumpf},
url = {https://www.jpier.org/PIERC/pier.php?paper=16020602},
doi = {doi:10.2528/PIERC16020602},
issn = {1937-8718},
year = {2016},
date = {2016-05-26},
journal = {Progress In Electromagnetics Research C},
volume = {64},
pages = {117-123},
abstract = {In this work we report an ultra-thin all-dielectric antenna that was designed, built, tested, and compared with simulated data. The objective of this research was to develop an antenna that is easily manufactured by common 3-D printers available today. 3-D printing is quickly revolutionizing manufacturing and the need to incorporate electrical elements like antennas is rising. Multi-material 3-D printing that can build parts with conductors and dielectrics is the future, but at present it is very immature and largely inaccessible. The antenna presented here represents our first steps in developing all-dielectric antennas that can be manufactured today with commonly available 3-D printers and materials. A monolithic antenna would have additional mechanical benefits when subjected to bending or thermal cycling. With this goal in mind, an ultra-thin all-dielectric antenna was developed. The antenna operates by taking advantage of total internal reflection and exciting a leaky whispering gallery mode. The antenna reported here operates at 2.4 GHz and was able to be as thin as 1.5 mm.},
keywords = {3D printing, all-dielectric antenna, hybrid 3D printing},
pubstate = {published},
tppubtype = {article}
}
In this work we report an ultra-thin all-dielectric antenna that was designed, built, tested, and compared with simulated data. The objective of this research was to develop an antenna that is easily manufactured by common 3-D printers available today. 3-D printing is quickly revolutionizing manufacturing and the need to incorporate electrical elements like antennas is rising. Multi-material 3-D printing that can build parts with conductors and dielectrics is the future, but at present it is very immature and largely inaccessible. The antenna presented here represents our first steps in developing all-dielectric antennas that can be manufactured today with commonly available 3-D printers and materials. A monolithic antenna would have additional mechanical benefits when subjected to bending or thermal cycling. With this goal in mind, an ultra-thin all-dielectric antenna was developed. The antenna operates by taking advantage of total internal reflection and exciting a leaky whispering gallery mode. The antenna reported here operates at 2.4 GHz and was able to be as thin as 1.5 mm.
Berry, Eric A; Gutierrez, Jesus; Rumpf, Raymond C
Design and simulation of arbitrarily-shaped transformation optic devices using a simple finite-difference method Journal Article
In: Progress In Electromagnetics Research B, vol. 68, pp. 1-16, 2016, ISSN: 1937-6472.
Abstract | Links | BibTeX | Tags: anisotropic finite-difference time-domain, spatial transforms, transformation optics
@article{RN108,
title = {Design and simulation of arbitrarily-shaped transformation optic devices using a simple finite-difference method},
author = {Eric A Berry and Jesus Gutierrez and Raymond C Rumpf},
url = {https://www.jpier.org/pierb/pier.php?paper=16012007},
doi = {doi:10.2528/PIERB16012007},
issn = {1937-6472},
year = {2016},
date = {2016-05-10},
journal = {Progress In Electromagnetics Research B},
volume = {68},
pages = {1-16},
abstract = {A fast and simple design methodology for transformation optics (TO) is described for devices having completely arbitrary geometries. An intuitive approach to the design of arbitrary devices is presented which enables possibilities not available through analytical coordinate transformations. Laplace's equation is solved using the finite-difference method to generate the arbitrary spatial transforms. Simple techniques are presented for enforcing boundary conditions and for isolating the solution of Laplace's equation to just the device itself. It is then described how to calculate the permittivity and permeability functions via TO from the numerical spatial transforms. Last, a modification is made to the standard anisotropic finite-difference frequency-domain (AFDFD) method for much faster and more efficient simulations. Several examples are given at the end to benchmark and to demonstrate the versatility of the approach. This work provides the basis for a complete set of tools to design and simulate transformation electromagnetic devices of any shape and size.},
keywords = {anisotropic finite-difference time-domain, spatial transforms, transformation optics},
pubstate = {published},
tppubtype = {article}
}
A fast and simple design methodology for transformation optics (TO) is described for devices having completely arbitrary geometries. An intuitive approach to the design of arbitrary devices is presented which enables possibilities not available through analytical coordinate transformations. Laplace's equation is solved using the finite-difference method to generate the arbitrary spatial transforms. Simple techniques are presented for enforcing boundary conditions and for isolating the solution of Laplace's equation to just the device itself. It is then described how to calculate the permittivity and permeability functions via TO from the numerical spatial transforms. Last, a modification is made to the standard anisotropic finite-difference frequency-domain (AFDFD) method for much faster and more efficient simulations. Several examples are given at the end to benchmark and to demonstrate the versatility of the approach. This work provides the basis for a complete set of tools to design and simulate transformation electromagnetic devices of any shape and size.
Avila, Jose Antonio
Dielectric prism antenna PhD Thesis
2016, ((OCoLC)957678686 by Jose Antonio Avila. illustrations (mostly color) ; 4 3/4 inches. Vita. Includes bibliographical references. Also available online via ProQuest Dissertations and Theses @ UTEP CD-ROM requires Adobe Acrobat Reader and CD-ROM drive. University of Texas at El Paso. Master's thesis.).
@phdthesis{RN176,
title = {Dielectric prism antenna},
author = {Jose Antonio Avila},
url = {https://digitalcommons.utep.edu/open_etd/804},
year = {2016},
date = {2016-01-01},
urldate = {2017-05-23},
note = {(OCoLC)957678686
by Jose Antonio Avila.
illustrations (mostly color) ; 4 3/4 inches.
Vita.
Includes bibliographical references. Also available online via ProQuest Dissertations and Theses @ UTEP
CD-ROM requires Adobe Acrobat Reader and CD-ROM drive.
University of Texas at El Paso. Master's thesis.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
2015
Rumpf, Raymond C; Pazos, Javier J; Digaum, Jennefir L; Kuebler, Stephen M
Spatially variant periodic structures in electromagnetics Journal Article
In: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, vol. 373, no. 2049, pp. 20140359, 2015, ISSN: 1364-503X.
Abstract | Links | BibTeX | Tags: fuctionally graded, metamaterials, metasurfaces, optics, photonic crystals, physiological optics, spatially variant, transformation optics
@article{RN102,
title = {Spatially variant periodic structures in electromagnetics},
author = {Raymond C Rumpf and Javier J Pazos and Jennefir L Digaum and Stephen M Kuebler},
url = {https://royalsocietypublishing.org/doi/full/10.1098/rsta.2014.0359},
doi = {https://doi.org/10.1098/rsta.2014.0359},
issn = {1364-503X},
year = {2015},
date = {2015-08-28},
journal = {Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences},
volume = {373},
number = {2049},
pages = {20140359},
abstract = {Spatial transforms are a popular technique for designing periodic structures that are macroscopically inhomogeneous. The structures are often required to be anisotropic, provide a magnetic response, and to have extreme values for the constitutive parameters in Maxwell's equations. Metamaterials and photonic crystals are capable of providing these, although sometimes only approximately. The problem still remains about how to generate the geometry of the final lattice when it is functionally graded, or spatially varied. This paper describes a simple numerical technique to spatially vary any periodic structure while minimizing deformations to the unit cells that would weaken or destroy the electromagnetic properties. New developments in this algorithm are disclosed that increase efficiency, improve the quality of the lattices and provide the ability to design aplanatic metasurfaces. The ability to spatially vary a lattice in this manner enables new design paradigms that are not possible using spatial transforms, three of which are discussed here. First, spatially variant self-collimating photonic crystals are shown to flow unguided waves around very tight bends using ordinary materials with low refractive index. Second, multi-mode waveguides in spatially variant band gap materials are shown to guide waves around bends without mixing power between the modes. Third, spatially variant anisotropic materials are shown to sculpt the near-field around electric components. This can be used to improve electromagnetic compatibility between components in close proximity.},
keywords = {fuctionally graded, metamaterials, metasurfaces, optics, photonic crystals, physiological optics, spatially variant, transformation optics},
pubstate = {published},
tppubtype = {article}
}
Spatial transforms are a popular technique for designing periodic structures that are macroscopically inhomogeneous. The structures are often required to be anisotropic, provide a magnetic response, and to have extreme values for the constitutive parameters in Maxwell's equations. Metamaterials and photonic crystals are capable of providing these, although sometimes only approximately. The problem still remains about how to generate the geometry of the final lattice when it is functionally graded, or spatially varied. This paper describes a simple numerical technique to spatially vary any periodic structure while minimizing deformations to the unit cells that would weaken or destroy the electromagnetic properties. New developments in this algorithm are disclosed that increase efficiency, improve the quality of the lattices and provide the ability to design aplanatic metasurfaces. The ability to spatially vary a lattice in this manner enables new design paradigms that are not possible using spatial transforms, three of which are discussed here. First, spatially variant self-collimating photonic crystals are shown to flow unguided waves around very tight bends using ordinary materials with low refractive index. Second, multi-mode waveguides in spatially variant band gap materials are shown to guide waves around bends without mixing power between the modes. Third, spatially variant anisotropic materials are shown to sculpt the near-field around electric components. This can be used to improve electromagnetic compatibility between components in close proximity.
D., Delfin; Karim, H.; A., Chavez L.; Romero, J. A.; Enriquez, R. E.; Martinez, R.; R., Sarker; Shuvo, M. A. I.; Rumpf, R. C.; Lin, Y.
A passive wireless temperature sensor for harsh environment applications based on frequency selective surface structures Presentation
01.06.2015.
BibTeX | Tags:
@misc{RN160,
title = {A passive wireless temperature sensor for harsh environment applications based on frequency selective surface structures},
author = {Delfin D. and H. Karim and Chavez L. A. and J. A. Romero and R. E. Enriquez and R. Martinez and Sarker R. and M. A. I. Shuvo and R. C. Rumpf and Y. Lin},
year = {2015},
date = {2015-06-01},
booktitle = {Southwest Energy Science and Engineering Symposium (SESES)},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
Rumpf, Raymond C
Engineering the dispersion and anisotropy of periodic electromagnetic structures Book Chapter
In: Solid State Physics, vol. 66, pp. 213-300, 2015, ISBN: 0081-1947.
Abstract | Links | BibTeX | Tags:
@inbook{RN101,
title = {Engineering the dispersion and anisotropy of periodic electromagnetic structures},
author = {Raymond C Rumpf},
url = {https://www.sciencedirect.com/science/article/abs/pii/S008119471500003X},
isbn = {0081-1947},
year = {2015},
date = {2015-06-01},
booktitle = {Solid State Physics},
volume = {66},
pages = {213-300},
abstract = {This chapter introduces the tools and methodologies that can be used to engineer the dispersion and anisotropy of periodic electromagnetic structures. The theory and concepts are presented in language that is as simple as possible, so the information will be useful and interesting to a wide audience. The history and motivation for the topic is given in Section 1 followed by a review of 3D printing and solid-state electromagnetics. Three simple but powerful numerical methods are presented for analyzing and designing periodic structures. The plane wave  expansion method is the dominant technique for calculating electromagnetic modes in periodic structures, particularly those composed of only dielectrics. The finite-difference frequency-domain method is highly versatile and is formulated in this chapter to model scattering from complex anisotropic objects in two dimensions. The last numerical method is a technique to spatially vary, or functionally grade, any of the attributes of a periodic structure while minimizing deformations and preventing defects. This tool can be used to “bend†lattices without changing the size and shape of the unit cells, which could destroy the electromagnetic properties. Next, concepts and methodologies are presented for anisotropic structures such as improving electromagnetic compatibility by sculpting near-fields using spatially variant anisotropic metamaterials. Lastly, concepts and methodologies for engineering the dispersion in periodic structures are presented. Effects such as self-collimation and negative refraction are discussed. Spatially variant self-collimation is introduced as a powerful means to control the flow of electromagnetic beams along arbitrary paths. The chapter concludes with a brief summary and suggests some topics for future research in this area.},
keywords = {},
pubstate = {published},
tppubtype = {inbook}
}
This chapter introduces the tools and methodologies that can be used to engineer the dispersion and anisotropy of periodic electromagnetic structures. The theory and concepts are presented in language that is as simple as possible, so the information will be useful and interesting to a wide audience. The history and motivation for the topic is given in Section 1 followed by a review of 3D printing and solid-state electromagnetics. Three simple but powerful numerical methods are presented for analyzing and designing periodic structures. The plane wave  expansion method is the dominant technique for calculating electromagnetic modes in periodic structures, particularly those composed of only dielectrics. The finite-difference frequency-domain method is highly versatile and is formulated in this chapter to model scattering from complex anisotropic objects in two dimensions. The last numerical method is a technique to spatially vary, or functionally grade, any of the attributes of a periodic structure while minimizing deformations and preventing defects. This tool can be used to “bend†lattices without changing the size and shape of the unit cells, which could destroy the electromagnetic properties. Next, concepts and methodologies are presented for anisotropic structures such as improving electromagnetic compatibility by sculpting near-fields using spatially variant anisotropic metamaterials. Lastly, concepts and methodologies for engineering the dispersion in periodic structures are presented. Effects such as self-collimation and negative refraction are discussed. Spatially variant self-collimation is introduced as a powerful means to control the flow of electromagnetic beams along arbitrary paths. The chapter concludes with a brief summary and suggests some topics for future research in this area.
Digaum, Jennefir L; Sharma, Rashi; Pazos, Javier J; Rumpf, Raymond C; Kuebler, Stephen M
Tight Control of Light Beams in Photonic Crystals with Spatially-Variant Unit Cells Proceedings Article
In: Frontiers in Optics, pp. FTu2B. 2, Optical Society of America, 2015.
Abstract | Links | BibTeX | Tags: spatially variant photonic crystals
@inproceedings{RN103,
title = {Tight Control of Light Beams in Photonic Crystals with Spatially-Variant Unit Cells},
author = {Jennefir L Digaum and Rashi Sharma and Javier J Pazos and Raymond C Rumpf and Stephen M Kuebler},
url = {https://www.osapublishing.org/abstract.cfm?uri=fio-2015-FTu2B.2&origin=search},
doi = {https://doi.org/10.1364/FIO.2015.FTu2B.2},
year = {2015},
date = {2015-05-01},
booktitle = {Frontiers in Optics},
pages = {FTu2B. 2},
publisher = {Optical Society of America},
abstract = {Spatially-variant photonic crystals can be used to direct light through tight turns, with turning radii as small as R bend  ~ 20 μm, whereas waveguides having similar R bend  exhibit high loss.},
keywords = {spatially variant photonic crystals},
pubstate = {published},
tppubtype = {inproceedings}
}
Spatially-variant photonic crystals can be used to direct light through tight turns, with turning radii as small as R bend  ~ 20 μm, whereas waveguides having similar R bend  exhibit high loss.
Enriquez, Jose Luis
Development of rigorous electromagnetic simulation tools for anisotropic structures Masters Thesis
2015, (946536514 by Jose Luis Enriquez Jr. illustrations ; 4 3/4 inches. Vita. Includes bibliographical references. Also available online. CD-ROM requires Adobe Acrobat Reader and CD-ROM drive. University of Texas at El Paso. Master's thesis.).
Links | BibTeX | Tags: algorithm development, anisotropy, electromagnetic devices, Electromagnetic devices. Anisotropy Simulation methods. Algorithms Development. Academic theses., simulation methods
@mastersthesis{RN177,
title = {Development of rigorous electromagnetic simulation tools for anisotropic structures},
author = {Jose Luis Enriquez},
url = {To access this resource online via ProQuest Dissertations and Theses @ UTEP http://0-search.proquest.com.lib.utep.edu/pqdtglobal/docview/1781014790/EE7C14367A0B4771PQ/1?accountid=7121},
year = {2015},
date = {2015-05-01},
pages = {1 computer disc (ix, 58 pages)},
note = {946536514
by Jose Luis Enriquez Jr.
illustrations ; 4 3/4 inches.
Vita.
Includes bibliographical references.
Also available online.
CD-ROM requires Adobe Acrobat Reader and CD-ROM drive.
University of Texas at El Paso. Master's thesis.},
keywords = {algorithm development, anisotropy, electromagnetic devices, Electromagnetic devices. Anisotropy Simulation methods. Algorithms Development. Academic theses., simulation methods},
pubstate = {published},
tppubtype = {mastersthesis}
}
Digaum, Jennefir L; Pazos, Javier; Rumpf, Raymond; Chiles, Jeff; Fathpour, Sasan; Thomas, Jeremy N; Kuebler, Stephen M
Polarization sensitive beam bending using a spatially variant photonic crystal Proceedings Article
In: Photonic and Phononic Properties of Engineered Nanostructures V, pp. 93710I, International Society for Optics and Photonics, 2015.
Abstract | Links | BibTeX | Tags: spatially-variant photonic crystals (SVPC), spatially-variant photonic crystals (SVPC), waveguide
@inproceedings{RN99,
title = {Polarization sensitive beam bending using a spatially variant photonic crystal},
author = {Jennefir L Digaum and Javier Pazos and Raymond Rumpf and Jeff Chiles and Sasan Fathpour and Jeremy N Thomas and Stephen M Kuebler},
url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9371/1/Polarization-sensitive-beam-bending-using-a-spatially-variant-photonic-crystal/10.1117/12.2076829.short},
doi = {https://doi.org/10.1117/12.2076829},
year = {2015},
date = {2015-02-27},
booktitle = {Photonic and Phononic Properties of Engineered Nanostructures V},
volume = {9371},
pages = {93710I},
publisher = {International Society for Optics and Photonics},
abstract = {A spatially-variant photonic crystal (SVPC) that can control the spatial propagation of electromagnetic waves in three dimensions with high polarization sensitivity was fabricated and characterized. The geometric attributes of the SVPC lattice were spatially varied to make use of the directional phenomena of self-collimation to tightly bend an unguided beam coherently through a 90 degree angle. Both the lattice spacing and the fill factor of the SVPC were maintained to be nearly constant throughout the structure. A finite-difference frequency-domain computational method confirms that the SVPC can self-collimate and bend light without significant diffuse scatter caused by the bend. The SVPC was fabricated using multi-photon direct laser writing in the photo-polymer SU-8. Mid-infrared light having a vacuum wavelength of λ0 = 2.94 μm was used to experimentally characterize the SVPCs by scanning the sides of the structure with optical fibers and measuring the intensity of light emanating from each face. Results show that the SVPC is capable of directing power flow of one polarization through a 90-degree turn, confirming the self-collimating and polarization selective light-guiding properties of the structures.},
keywords = {spatially-variant photonic crystals (SVPC), spatially-variant photonic crystals (SVPC), waveguide},
pubstate = {published},
tppubtype = {inproceedings}
}
A spatially-variant photonic crystal (SVPC) that can control the spatial propagation of electromagnetic waves in three dimensions with high polarization sensitivity was fabricated and characterized. The geometric attributes of the SVPC lattice were spatially varied to make use of the directional phenomena of self-collimation to tightly bend an unguided beam coherently through a 90 degree angle. Both the lattice spacing and the fill factor of the SVPC were maintained to be nearly constant throughout the structure. A finite-difference frequency-domain computational method confirms that the SVPC can self-collimate and bend light without significant diffuse scatter caused by the bend. The SVPC was fabricated using multi-photon direct laser writing in the photo-polymer SU-8. Mid-infrared light having a vacuum wavelength of λ0 = 2.94 μm was used to experimentally characterize the SVPCs by scanning the sides of the structure with optical fibers and measuring the intensity of light emanating from each face. Results show that the SVPC is capable of directing power flow of one polarization through a 90-degree turn, confirming the self-collimating and polarization selective light-guiding properties of the structures.
Digaum, Jennefir L; Sharma, Rashi; Batista, Daniel; Pazos, Javier J; Rumpf, Raymond C; Kuebler, Stephen M
Beam-bending in spatially variant photonic crystals at telecommunications wavelengths Proceedings
International Society for Optics and Photonics, vol. 9759, 2015.
Abstract | Links | BibTeX | Tags: self-collimation, spatially variant photonic crystals, spatially-variant photonic crystals (SVPC), waveguide
@proceedings{RN105,
title = {Beam-bending in spatially variant photonic crystals at telecommunications wavelengths},
author = {Jennefir L Digaum and Rashi Sharma and Daniel Batista and Javier J Pazos and Raymond C Rumpf and Stephen M Kuebler},
url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9371/1/Polarization-sensitive-beam-bending-using-a-spatially-variant-photonic-crystal/10.1117/12.2076829.short},
doi = {https://doi.org/10.1117/12.2076829},
year = {2015},
date = {2015-02-27},
booktitle = {Advanced Fabrication Technologies for Micro/Nano Optics and Photonics IX},
volume = {9759},
pages = {975911},
publisher = {International Society for Optics and Photonics},
abstract = {A spatially-variant photonic crystal (SVPC) that can control the spatial propagation of electromagnetic waves in three dimensions with high polarization sensitivity was fabricated and characterized. The geometric attributes of the SVPC lattice were spatially varied to make use of the directional phenomena of self-collimation to tightly bend an unguided beam coherently through a 90 degree angle. Both the lattice spacing and the fill factor of the SVPC were maintained to be nearly constant throughout the structure. A finite-difference frequency-domain computational method confirms that the SVPC can self-collimate and bend light without significant diffuse scatter caused by the bend. The SVPC was fabricated using multi-photon direct laser writing in the photo-polymer SU-8. Mid-infrared light having a vacuum wavelength of λ0 = 2.94 μm was used to experimentally characterize the SVPCs by scanning the sides of the structure with optical fibers and measuring the intensity of light emanating from each face. Results show that the SVPC is capable of directing power flow of one polarization through a 90-degree turn, confirming the self-collimating and polarization selective light-guiding properties of the structures.},
keywords = {self-collimation, spatially variant photonic crystals, spatially-variant photonic crystals (SVPC), waveguide},
pubstate = {published},
tppubtype = {proceedings}
}
A spatially-variant photonic crystal (SVPC) that can control the spatial propagation of electromagnetic waves in three dimensions with high polarization sensitivity was fabricated and characterized. The geometric attributes of the SVPC lattice were spatially varied to make use of the directional phenomena of self-collimation to tightly bend an unguided beam coherently through a 90 degree angle. Both the lattice spacing and the fill factor of the SVPC were maintained to be nearly constant throughout the structure. A finite-difference frequency-domain computational method confirms that the SVPC can self-collimate and bend light without significant diffuse scatter caused by the bend. The SVPC was fabricated using multi-photon direct laser writing in the photo-polymer SU-8. Mid-infrared light having a vacuum wavelength of λ0 = 2.94 μm was used to experimentally characterize the SVPCs by scanning the sides of the structure with optical fibers and measuring the intensity of light emanating from each face. Results show that the SVPC is capable of directing power flow of one polarization through a 90-degree turn, confirming the self-collimating and polarization selective light-guiding properties of the structures.
Barton, Jay H; Garcia, Cesar R; Berry, Eric A; Salas, Rodolfo; Rumpf, Raymond C
3-D printed all-dielectric frequency selective surface with large bandwidth and field of view Journal Article
In: IEEE transactions on antennas and propagation, vol. 63, no. 3, pp. 1032-1039, 2015, ISSN: 0018-926X.
Abstract | Links | BibTeX | Tags: all-dielectric, genetic algorithm, guided mode resonance (GMR), high power microwave
@article{RN98,
title = {3-D printed all-dielectric frequency selective surface with large bandwidth and field of view},
author = {Jay H Barton and Cesar R Garcia and Eric A Berry and Rodolfo Salas and Raymond C Rumpf},
url = {https://ieeexplore.ieee.org/document/7004011},
doi = {10.1109/TAP.2015.2388541},
issn = {0018-926X},
year = {2015},
date = {2015-01-07},
journal = {IEEE transactions on antennas and propagation},
volume = {63},
number = {3},
pages = {1032-1039},
abstract = {In this paper, an all-dielectric frequency selective surface (ADFSS) was developed using genetic algorithms and fast Fourier transforms (FFTs) to generate random geometries. This device showed a stop-band fractional bandwidth (FBW) of 54% and a field of view of 16°. The optimized FSS was manufactured by three-dimensional (3-D) printing and the frequency response was measured in the laboratory. This device was also tested in the pass band at a high pulsed microwave power of 45.26 MW/m 2  and no damage was observed. This is the first known demonstration of a 3-D printed ADFSS.},
keywords = {all-dielectric, genetic algorithm, guided mode resonance (GMR), high power microwave},
pubstate = {published},
tppubtype = {article}
}
In this paper, an all-dielectric frequency selective surface (ADFSS) was developed using genetic algorithms and fast Fourier transforms (FFTs) to generate random geometries. This device showed a stop-band fractional bandwidth (FBW) of 54% and a field of view of 16°. The optimized FSS was manufactured by three-dimensional (3-D) printing and the frequency response was measured in the laboratory. This device was also tested in the pass band at a high pulsed microwave power of 45.26 MW/m 2  and no damage was observed. This is the first known demonstration of a 3-D printed ADFSS.
Chavez, L. A.; Delfin, D.; Karim, H.; Romero, J.; Enriquez, R.; Rumpf, R.; Lin, Y.
Wireless, passive temperature sensor based on frequency selective surfaces for harsh environment applications Presentation
COURI (Campus Office for Undergraduate Research Initiatives) Symposium, 01.01.2015.
@misc{RN159,
title = {Wireless, passive temperature sensor based on frequency selective surfaces for harsh environment applications},
author = {L. A. Chavez and D. Delfin and H. Karim and J. Romero and R. Enriquez and R. Rumpf and Y. Lin},
year = {2015},
date = {2015-01-01},
booktitle = {COURI (Campus Office for Undergraduate Research Initiatives) Symposium},
journal = {Optics Letters},
abstract = {Wide-angle, broadband self-collimation (SC) is demonstrated in a hexagonal photonic crystal (PhC) fabricated in a low-refractive-index photopolymer by multiphoton lithography. The PhC can be described as a hexagonal array of cylindrical air holes in a block of dielectric material having a low-refractive index. Optical characterization shows that the device strongly self-collimates light at near-infrared wavelengths that span 1360 to 1610 nm. SC forces light to flow along the extrusion direction of the lattice without diffractive spreading, even when light couples into the device at high oblique angles. Numerical simulations corroborate the experimental findings.},
howpublished = {COURI (Campus Office for Undergraduate Research Initiatives) Symposium},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
Wide-angle, broadband self-collimation (SC) is demonstrated in a hexagonal photonic crystal (PhC) fabricated in a low-refractive-index photopolymer by multiphoton lithography. The PhC can be described as a hexagonal array of cylindrical air holes in a block of dielectric material having a low-refractive index. Optical characterization shows that the device strongly self-collimates light at near-infrared wavelengths that span 1360 to 1610 nm. SC forces light to flow along the extrusion direction of the lattice without diffractive spreading, even when light couples into the device at high oblique angles. Numerical simulations corroborate the experimental findings.
2014
Pazos, Javier Jair
Digitally manufactured spatially variant photonic crystals PhD Thesis
2014, (960871768 by Javier Jair Pazos. illustrations (mostly color) ; 4 3/4 inches. Vita. Includes bibliographical references. Also available online. CD-ROM requires Adobe Acrobat Reader and CD-ROM drive. University of Texas at El Paso. Doctoral dissertation.).
Links | BibTeX | Tags: dielectric devices, electromagnetic testing, metamaterials, particle size determination, photonic crystals
@phdthesis{RN172,
title = {Digitally manufactured spatially variant photonic crystals},
author = {Javier Jair Pazos},
url = {http://0-search.proquest.com.lib.utep.edu/pqdtglobal/docview/1703031279/32D98817B27C49FBPQ/1?accountid=7121},
year = {2014},
date = {2014-12-04},
urldate = {2014-12-04},
note = {960871768
by Javier Jair Pazos.
illustrations (mostly color) ; 4 3/4 inches.
Vita.
Includes bibliographical references.
Also available online.
CD-ROM requires Adobe Acrobat Reader and CD-ROM drive.
University of Texas at El Paso. Doctoral dissertation.},
keywords = {dielectric devices, electromagnetic testing, metamaterials, particle size determination, photonic crystals},
pubstate = {published},
tppubtype = {phdthesis}
}
Hwang, Seyeon; Reyes, Edgar I; Moon, Kyoung-sik; Rumpf, Raymond C; Kim, Nam Soo
In: Journal of Electronic Materials, vol. 44, no. 3, pp. 771-777, 2014, ISSN: 1543-186X.
Abstract | Links | BibTeX | Tags: 3D printing, copper, fused deposition modeling, iron, large-scale 3D printing, Metal/polymer composite filament, thermo-mechanical properties
@article{RN100,
title = {Thermo-mechanical characterization of metal/polymer composite filaments and printing parameter study for fused deposition modeling in the 3D printing process},
author = {Seyeon Hwang and Edgar I Reyes and Kyoung-sik Moon and Raymond C Rumpf and Nam Soo Kim},
url = {https://link.springer.com/content/pdf/10.1007%2Fs11664-014-3425-6.pdf},
doi = {DOI: 10.1007/s11664-014-3425-6},
issn = {1543-186X},
year = {2014},
date = {2014-10-29},
journal = {Journal of Electronic Materials},
volume = {44},
number = {3},
pages = {771-777},
abstract = {New metal/polymer composite filaments for fused deposition modeling (FDM)
processes were developed in order to observe the thermo-mechanical properties of the new filaments. The acrylonitrile butadiene styrene (ABS) thermoplastic was mixed with copper and iron particles. The percent loading of the
metal powder was varied to confirm the effects of metal particles on the
thermo-mechanical properties of the filament, such as tensile strength and
thermal conductivity. The printing parameters such as temperature and fill
density were also varied to see the effects of the parameters on the tensile
strength of the final product which was made with the FDM process. As a
result of this study, it was confirmed that the tensile strength of the composites is decreased by increasing the loading of metal particles. Additionally,
the thermal conductivity of the metal/polymer composite filament was improved by increasing the metal content. It is believed that the metal/polymer
filament could be used to print metal and large-scale 3-dimensional (3D)
structures without any distortion by the thermal expansion of thermoplastics.
The material could also be used in 3D printed circuits and electromagnetic
structures for shielding and other applications.},
keywords = {3D printing, copper, fused deposition modeling, iron, large-scale 3D printing, Metal/polymer composite filament, thermo-mechanical properties},
pubstate = {published},
tppubtype = {article}
}
New metal/polymer composite filaments for fused deposition modeling (FDM)
processes were developed in order to observe the thermo-mechanical properties of the new filaments. The acrylonitrile butadiene styrene (ABS) thermoplastic was mixed with copper and iron particles. The percent loading of the
metal powder was varied to confirm the effects of metal particles on the
thermo-mechanical properties of the filament, such as tensile strength and
thermal conductivity. The printing parameters such as temperature and fill
density were also varied to see the effects of the parameters on the tensile
strength of the final product which was made with the FDM process. As a
result of this study, it was confirmed that the tensile strength of the composites is decreased by increasing the loading of metal particles. Additionally,
the thermal conductivity of the metal/polymer composite filament was improved by increasing the metal content. It is believed that the metal/polymer
filament could be used to print metal and large-scale 3-dimensional (3D)
structures without any distortion by the thermal expansion of thermoplastics.
The material could also be used in 3D printed circuits and electromagnetic
structures for shielding and other applications.
processes were developed in order to observe the thermo-mechanical properties of the new filaments. The acrylonitrile butadiene styrene (ABS) thermoplastic was mixed with copper and iron particles. The percent loading of the
metal powder was varied to confirm the effects of metal particles on the
thermo-mechanical properties of the filament, such as tensile strength and
thermal conductivity. The printing parameters such as temperature and fill
density were also varied to see the effects of the parameters on the tensile
strength of the final product which was made with the FDM process. As a
result of this study, it was confirmed that the tensile strength of the composites is decreased by increasing the loading of metal particles. Additionally,
the thermal conductivity of the metal/polymer composite filament was improved by increasing the metal content. It is believed that the metal/polymer
filament could be used to print metal and large-scale 3-dimensional (3D)
structures without any distortion by the thermal expansion of thermoplastics.
The material could also be used in 3D printed circuits and electromagnetic
structures for shielding and other applications.
Kuebler, Stephen M; Digaum, Jenefir L; Pazos, Javier; Chiles, Jeffrey; Padilla, Gabriel; Tatulian, Adrian; Rumpf, Raymond C; Fathpour, Sasan
Controlling Light using Three-Dimensional Spatially Variant Self-Collimating Photonic Crystals Proceedings
Optical Society of America, 2014.
Abstract | Links | BibTeX | Tags: all-dielectric photonic crystal, optical beam, self-collimation
@proceedings{RN94,
title = {Controlling Light using Three-Dimensional Spatially Variant Self-Collimating Photonic Crystals},
author = {Stephen M Kuebler and Jenefir L Digaum and Javier Pazos and Jeffrey Chiles and Gabriel Padilla and Adrian Tatulian and Raymond C Rumpf and Sasan Fathpour},
url = {https://www.osapublishing.org/abstract.cfm?uri=fio-2014-FW1A.1&origin=search},
doi = {https://doi.org/10.1364/FIO.2014.FW1A.1},
year = {2014},
date = {2014-10-19},
booktitle = {Frontiers in Optics},
pages = {FW1A. 1},
publisher = {Optical Society of America},
abstract = {Tight control of an optical beam is demonstrated based on self-collimation within three-dimensional all-dielectric photonic crystals for which the orientation of the unit cell is progressively varied to direct power flow.},
keywords = {all-dielectric photonic crystal, optical beam, self-collimation},
pubstate = {published},
tppubtype = {proceedings}
}
Tight control of an optical beam is demonstrated based on self-collimation within three-dimensional all-dielectric photonic crystals for which the orientation of the unit cell is progressively varied to direct power flow.
Kairm, Hasanul; Delfin, Diego; Shuvo, Mohammad Arif Ishtiaque; Chavez, Luis A; Garcia, Cesar R; Barton, Jay H; Gaytan, Sara M; Cadena, Monica A; Rumpf, Raymond C; Wicker, Ryan B
Concept and model of a metamaterial-based passive wireless temperature sensor for harsh environment applications Journal Article
In: IEEE Sensors Journal, vol. 15, no. 3, pp. 1445-1452, 2014, ISSN: 1530-437X.
Abstract | Links | BibTeX | Tags:
@article{RN95,
title = {Concept and model of a metamaterial-based passive wireless temperature sensor for harsh environment applications},
author = {Hasanul Kairm and Diego Delfin and Mohammad Arif Ishtiaque Shuvo and Luis A Chavez and Cesar R Garcia and Jay H Barton and Sara M Gaytan and Monica A Cadena and Raymond C Rumpf and Ryan B Wicker},
url = {https://ieeexplore.ieee.org/document/6924738?arnumber=6924738},
doi = {10.1109/JSEN.2014.2363095},
issn = {1530-437X},
year = {2014},
date = {2014-10-15},
journal = {IEEE Sensors Journal},
volume = {15},
number = {3},
pages = {1445-1452},
abstract = {Wireless passive temperature sensors are receiving increasing attention due to the ever-growing need of improving energy efficient and precise monitoring of temperature in high-temperature energy conversion systems, such as gas turbines and coal-based power plants. Unfortunately, the harsh environment, such as high temperature and corrosive atmosphere present in these systems, has significantly limited the reliability and increased the costs of current solutions. Therefore, this paper presents the concept and design of a low cost, passive, and wireless temperature sensor that can withstand high temperature and harsh environments. The temperature sensor was designed following the principle of metamaterials by utilizing closed ring resonators in a dielectric ceramic matrix. The proposed wireless, passive temperature sensor behaves like an L C  circuit, which has a temperature-dependent resonance frequency. Full-wave electromagnetic solver Ansys Ansoft HFSS was used to validate the model and evaluate the effect of different geometry and combination of split ring resonator structures on the sensitivity and electrical sizes of the proposed sensor. The results demonstrate the feasibility of the sensor and provide guidance for future fabrication and testing.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Wireless passive temperature sensors are receiving increasing attention due to the ever-growing need of improving energy efficient and precise monitoring of temperature in high-temperature energy conversion systems, such as gas turbines and coal-based power plants. Unfortunately, the harsh environment, such as high temperature and corrosive atmosphere present in these systems, has significantly limited the reliability and increased the costs of current solutions. Therefore, this paper presents the concept and design of a low cost, passive, and wireless temperature sensor that can withstand high temperature and harsh environments. The temperature sensor was designed following the principle of metamaterials by utilizing closed ring resonators in a dielectric ceramic matrix. The proposed wireless, passive temperature sensor behaves like an L C  circuit, which has a temperature-dependent resonance frequency. Full-wave electromagnetic solver Ansys Ansoft HFSS was used to validate the model and evaluate the effect of different geometry and combination of split ring resonator structures on the sensitivity and electrical sizes of the proposed sensor. The results demonstrate the feasibility of the sensor and provide guidance for future fabrication and testing.
Rumpf, Raymond C; Garcia, Cesar R; Berry, Eric A; Barton, Jay H
Finite-difference frequency-domain algorithm for modeling electromagnetic scattering from general anisotropic objects Journal Article
In: Progress In Electromagnetics Research B, vol. 61, pp. 55-67, 2014, ISSN: 1937-6472.
Abstract | Links | BibTeX | Tags: finite-difference frequency-domain (FDFD), finite-difference frequency-domain (FDFD)
@article{RN92,
title = {Finite-difference frequency-domain algorithm for modeling electromagnetic scattering from general anisotropic objects},
author = {Raymond C Rumpf and Cesar R Garcia and Eric A Berry and Jay H Barton},
url = {https://www.jpier.org/pierb/pier.php?paper=14071606},
doi = {doi:10.2528/PIERB14071606},
issn = {1937-6472},
year = {2014},
date = {2014-09-12},
journal = {Progress In Electromagnetics Research B},
volume = {61},
pages = {55-67},
abstract = {The finite-difference frequency-domain (FDFD) method is a very simple and powerful approach for rigorous analysis of electromagnetic structures. It may be the simplest of all methods to implement and is excellent for field visualization and for developing new ways to model devices. This paper describes a simple method for incorporating anisotropic materials with arbitrary tensors for both permittivity and permeability into the FDFD method. The algorithm is benchmarked by comparing transmission and reflection results for an anisotropic guided-mode resonant filter simulated in HFSS and FDFD. The anisotropic FDFD method is then applied to a lens and cloak designed by transformation optics.},
keywords = {finite-difference frequency-domain (FDFD), finite-difference frequency-domain (FDFD)},
pubstate = {published},
tppubtype = {article}
}
The finite-difference frequency-domain (FDFD) method is a very simple and powerful approach for rigorous analysis of electromagnetic structures. It may be the simplest of all methods to implement and is excellent for field visualization and for developing new ways to model devices. This paper describes a simple method for incorporating anisotropic materials with arbitrary tensors for both permittivity and permeability into the FDFD method. The algorithm is benchmarked by comparing transmission and reflection results for an anisotropic guided-mode resonant filter simulated in HFSS and FDFD. The anisotropic FDFD method is then applied to a lens and cloak designed by transformation optics.
Rodriguez, Ricardo Xavier
Characterization of direct print additive manufacturing process for 3D build of a carbon nanostructure composite Masters Thesis
2014, (929985145 by Ricardo Xavier Rodriguez. illustrations (mostly color) ; 4 3/4 inches. Master's thesis / University of Texas at El Paso. Title from title screen. Vita. Includes bibliographical references. Also available online. CD-ROM Requires Adobe Acrobat Reader and CD-ROM drive. University of Texas at El Paso. Master's thesis.).
@mastersthesis{RN179,
title = {Characterization of direct print additive manufacturing process for 3D build of a carbon nanostructure composite},
author = {Ricardo Xavier Rodriguez},
url = {To access this resource online via ProQuest Dissertations and Theses @ UTEP http://0-search.proquest.com.lib.utep.edu/pqdtglobal/docview/1615403043/D1DD12A96D1E4DF2PQ/1?accountid=7121},
year = {2014},
date = {2014-08-01},
urldate = {2014-08-01},
note = {929985145
by Ricardo Xavier Rodriguez.
illustrations (mostly color) ; 4 3/4 inches.
Master's thesis / University of Texas at El Paso.
Title from title screen.
Vita.
Includes bibliographical references.
Also available online.
CD-ROM Requires Adobe Acrobat Reader and CD-ROM drive.
University of Texas at El Paso. Master's thesis.},
keywords = {},
pubstate = {published},
tppubtype = {mastersthesis}
}
Deffenbaugh, Paul Issac
3D printed electromagnetic transmission and electronic structures fabricated on a single platform using advanced process integration techniques PhD Thesis
2014.
BibTeX | Tags:
@phdthesis{RN115,
title = {3D printed electromagnetic transmission and electronic structures fabricated on a single platform using advanced process integration techniques},
author = {Paul Issac Deffenbaugh},
year = {2014},
date = {2014-07-01},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
Hwang, S; Reyes, EI; Kim, NS; Moon, KS; Rumpf, RC
In: Biotechnology Agriculture Environment and Energy; Zheng, F., Ed.; CRC Press: Boca Raton, FL, USA, pp. 347-352, 2014.
Abstract | Links | BibTeX | Tags:
@inbook{RN146,
title = {Parameter study of fused deposition modeling process on thermo-mechanical properties of the final 3D structures made by metal/polymer composite filaments},
author = {S Hwang and EI Reyes and NS Kim and KS Moon and RC Rumpf},
url = {https://www.taylorfrancis.com/chapters/edit/10.1201/b17720-78/parameter-study-fused-deposition-modeling-process-thermo-mechanical-properties-final-3d-structures-made-metal-polymer-composite-filaments-hwang-reyes-kim-moon-rumpf},
year = {2014},
date = {2014-07-01},
booktitle = {Biotechnology Agriculture Environment and Energy; Zheng, F., Ed.; CRC Press: Boca Raton, FL, USA},
pages = {347-352},
abstract = {Recently, development of the large-scale 3D products has attracted people’s attention. When printing the large-scale 3D products by using the FDM printer, the main problem is the distortion of the final products during printing. The distortion is caused by the thermal contraction of thermoplastic filaments. With the purpose of preventing distortion of the final 3D products, some FDM printers include the heating plate or glues, but these methods, in some cases, may not be enough to solve the distortion problem.},
keywords = {},
pubstate = {published},
tppubtype = {inbook}
}
Recently, development of the large-scale 3D products has attracted people’s attention. When printing the large-scale 3D products by using the FDM printer, the main problem is the distortion of the final products during printing. The distortion is caused by the thermal contraction of thermoplastic filaments. With the purpose of preventing distortion of the final 3D products, some FDM printers include the heating plate or glues, but these methods, in some cases, may not be enough to solve the distortion problem.
Freymann, Georg Von; Schoenfeld, Winston V; Rumpf, Raymond C
Advanced Fabrication Technologies for Micro/Nano Optics and Photonics VIII Proceedings
vol. 9374, 2014.
BibTeX | Tags:
@proceedings{RN67,
title = {Advanced Fabrication Technologies for Micro/Nano Optics and Photonics VIII},
author = {Georg Von Freymann and Winston V Schoenfeld and Raymond C Rumpf},
year = {2014},
date = {2014-07-01},
booktitle = {Proc. of SPIE Vol},
volume = {9374},
pages = {937401-1},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
Barton, Jay Houston
Frequency selective surfaces for extreme applications PhD Thesis
2014, (960871772 by Jay Houston Barton. illustrations (mostly color) ; 4 3/4 inches. Vita. Includes bibliographical references. Also available online via ProQuest Dissertations and Theses @ UTEP CD-ROM requires Adobe Acrobat Reader and CD-ROM drive. University of Texas at El Paso. Doctoral dissertation.).
Links | BibTeX | Tags: application software, dielectrics, electromagnetic testing, extreme environments, magnetic properties
@phdthesis{RN173,
title = {Frequency selective surfaces for extreme applications},
author = {Jay Houston Barton},
url = {To access this resource online via ScholarWorks @ UTEP https://digitalcommons.utep.edu/open_etd/809},
year = {2014},
date = {2014-05-02},
note = {960871772
by Jay Houston Barton.
illustrations (mostly color) ; 4 3/4 inches.
Vita.
Includes bibliographical references. Also available online via ProQuest Dissertations and Theses @ UTEP
CD-ROM requires Adobe Acrobat Reader and CD-ROM drive.
University of Texas at El Paso. Doctoral dissertation.},
keywords = {application software, dielectrics, electromagnetic testing, extreme environments, magnetic properties},
pubstate = {published},
tppubtype = {phdthesis}
}
Garcia, Cesar Roman
3D printed spatially variant anisotropic metamaterials PhD Thesis
2014, (960871957 by Cesar Roman Garcia. Three dimensional printed spatially variant anisotropic metamaterials. illustrations (mostly color) ; 4 3/4 inches. Vita. Includes bibliographical references. CD-ROM requires Adobe Acrobat Reader and CD-ROM drive. Also available online via ProQuest Dissertations and Theses @ UTEP University of Texas at El Paso. Doctoral dissertation.).
@phdthesis{RN174,
title = {3D printed spatially variant anisotropic metamaterials},
author = {Cesar Roman Garcia},
url = {To access this resource online via ScholarWorks @ UTEP https://digitalcommons.utep.edu/open_etd/848},
year = {2014},
date = {2014-05-01},
note = {960871957
by Cesar Roman Garcia.
Three dimensional printed spatially variant anisotropic metamaterials.
illustrations (mostly color) ; 4 3/4 inches.
Vita.
Includes bibliographical references.
CD-ROM requires Adobe Acrobat Reader and CD-ROM drive. Also available online via ProQuest Dissertations and Theses @ UTEP
University of Texas at El Paso. Doctoral dissertation.},
keywords = {},
pubstate = {published},
tppubtype = {phdthesis}
}
Karim, Hasanul; Delphin, D.; Rumpf, R. C.; Y., Lin; Choudhuri, Ahsan R
Development of passive wireless temperature sensors using metamaterials Presentation
01.05.2014.
BibTeX | Tags:
@misc{RN87,
title = {Development of passive wireless temperature sensors using metamaterials},
author = {Hasanul Karim and D. Delphin and R. C. Rumpf and Lin Y. and Ahsan R Choudhuri},
year = {2014},
date = {2014-05-01},
booktitle = {52nd Aerospace Sciences Meeting, AIAA},
pages = {0855},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
Barton, Jay H; Garcia, Cesar R; Berry, EA; May, RG; Gray, DT; Rumpf, RC
All-dielectric frequency selective surface for high power microwaves Journal Article
In: IEEE Transactions on Antennas and Propagation, vol. 62, no. 7, pp. 3652-3656, 2014, ISSN: 0018-926X.
Abstract | Links | BibTeX | Tags: guided mode, resonance
@article{RN80,
title = {All-dielectric frequency selective surface for high power microwaves},
author = {Jay H Barton and Cesar R Garcia and EA Berry and RG May and DT Gray and RC Rumpf},
url = {https://ieeexplore.ieee.org/document/6807717},
doi = {10.1109/TAP.2014.2320525},
issn = {0018-926X},
year = {2014},
date = {2014-04-29},
urldate = {2014-04-29},
journal = {IEEE Transactions on Antennas and Propagation},
volume = {62},
number = {7},
pages = {3652-3656},
abstract = {In this work, an all-dielectric frequency selective surface was developed for high power microwaves. By avoiding the use of metals, arcing at field concentration points and heating in the conductors was avoided. To do this in a compact form factor while still producing a strong frequency response, we based our design on guided-mode resonance (GMR). To make this approach viable for radio and microwave frequencies, we overcame three major challenges. First, conventional GMR devices have less than 1% fractional bandwidth and we extended this to 16%. Second, conventional GMR devices have a field-of-view less than 1 °  and we extended this to over 40 °  . Third, conventional GMR devices must be composed of hundreds of periods to operate, but our device operated very well with only eight. In this paper, we present our design and experimental results at 1.7 GW/m 2  .},
keywords = {guided mode, resonance},
pubstate = {published},
tppubtype = {article}
}
In this work, an all-dielectric frequency selective surface was developed for high power microwaves. By avoiding the use of metals, arcing at field concentration points and heating in the conductors was avoided. To do this in a compact form factor while still producing a strong frequency response, we based our design on guided-mode resonance (GMR). To make this approach viable for radio and microwave frequencies, we overcame three major challenges. First, conventional GMR devices have less than 1% fractional bandwidth and we extended this to 16%. Second, conventional GMR devices have a field-of-view less than 1 °  and we extended this to over 40 °  . Third, conventional GMR devices must be composed of hundreds of periods to operate, but our device operated very well with only eight. In this paper, we present our design and experimental results at 1.7 GW/m 2  .
Karim, Hasanul; Shuvo, Mohammad Arif Ishtiaq; Delfin, Diego; Lin, Yirong; Choudhuri, Ahsan; Rumpf, RC
Development of metamaterial based low cost passive wireless temperature sensor Presentation
08.03.2014.
Abstract | Links | BibTeX | Tags: closed ring resonators, metamaterials, sensors
@misc{RN90,
title = {Development of metamaterial based low cost passive wireless temperature sensor},
author = {Hasanul Karim and Mohammad Arif Ishtiaq Shuvo and Diego Delfin and Yirong Lin and Ahsan Choudhuri and RC Rumpf},
url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9061/1/Development-of-metamaterial-based-low-cost-passive-wireless-temperature-sensor/10.1117/12.2045242.short},
doi = {https://doi.org/10.1117/12.2045242},
year = {2014},
date = {2014-03-08},
booktitle = {Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014},
volume = {9061},
pages = {90612K},
publisher = {International Society for Optics and Photonics},
abstract = {Wireless passive temperature sensors are gaining increasing attention due to the ever-growing need of precise monitoring of temperature in high temperature energy conversion systems such as gas turbines and coal-based power plants. Unfortunately, the harsh environment such as high temperature and corrosive atmosphere present in these systems limits current solutions. In order to alleviate these issues, this paper presents the design, simulation, and manufacturing process of a low cost, passive, and wireless temperature sensor that can withstand high temperature and harsh environment. The temperature sensor was designed following the principle of metamaterials by utilizing Closed Ring Resonators (CRR) embedded in a dielectric matrix. The proposed wireless, passive temperature sensor behaves like an LC circuit that has a resonance frequency that depends on temperature. A full wave electromagnetic solver Ansys Ansoft HFSS was used to perform simulations to determine the optimum dimensions and geometry of the sensor unit. The sensor unit was prepared by conventional powder-binder compression method. Commercially available metal washers were used as CRR structures and Barium Titanate (BTO) was used as the dielectric materials. Response of the fabricated sensor at room temperature was analyzed using a pair of horn antenna connected with a network analyzer.},
keywords = {closed ring resonators, metamaterials, sensors},
pubstate = {published},
tppubtype = {presentation}
}
Wireless passive temperature sensors are gaining increasing attention due to the ever-growing need of precise monitoring of temperature in high temperature energy conversion systems such as gas turbines and coal-based power plants. Unfortunately, the harsh environment such as high temperature and corrosive atmosphere present in these systems limits current solutions. In order to alleviate these issues, this paper presents the design, simulation, and manufacturing process of a low cost, passive, and wireless temperature sensor that can withstand high temperature and harsh environment. The temperature sensor was designed following the principle of metamaterials by utilizing Closed Ring Resonators (CRR) embedded in a dielectric matrix. The proposed wireless, passive temperature sensor behaves like an LC circuit that has a resonance frequency that depends on temperature. A full wave electromagnetic solver Ansys Ansoft HFSS was used to perform simulations to determine the optimum dimensions and geometry of the sensor unit. The sensor unit was prepared by conventional powder-binder compression method. Commercially available metal washers were used as CRR structures and Barium Titanate (BTO) was used as the dielectric materials. Response of the fabricated sensor at room temperature was analyzed using a pair of horn antenna connected with a network analyzer.
Quintana, Joel; Rumpf, Raymond; Gonzalez, Virgilio
International Society for Optics and Photonics, vol. 8988, 2014.
Abstract | Links | BibTeX | Tags: fiber-bragg grating, sensors
@proceedings{RN89,
title = {Modified transfer matrix method model for a fiber Bragg grating strain sensor in polarization maintaining single mode optical fiber},
author = {Joel Quintana and Raymond Rumpf and Virgilio Gonzalez},
url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/8988/1/Modified-transfer-matrix-method-model-for-a-fiber-Bragg-grating/10.1117/12.2040674.short},
doi = {https://doi.org/10.1117/12.2040674},
year = {2014},
date = {2014-03-08},
booktitle = {Integrated Optics: Devices, Materials, and Technologies XVIII},
volume = {8988},
pages = {89881B},
publisher = {International Society for Optics and Photonics},
abstract = {Fiber-Bragg Gratings (FBG) for Structural Health Monitoring (SHM) have been studied extensively as they offer electrically passive operation, EMI immunity, high sensitivity, and multiple multiplexing schemes, as compared to conventional electricity based strain sensors. FBG sensors written in Polarization Maintaining (PM) optical fiber offer an additional dimension of strain measurement simplifying sensor implementation within a structure. This simplification however, adds complexity to the detection of the sensor’s optical response to its corresponding applied strain. We propose a modified Transfer Matrix Method model to simulate a fiber Bragg grating (FBG) in a polarization maintaining optical fiber. We study the effects of the reflected Bragg wavelength to the changes in shape of the optical fiber core waveguide and compare the results to the existing literature.},
keywords = {fiber-bragg grating, sensors},
pubstate = {published},
tppubtype = {proceedings}
}
Fiber-Bragg Gratings (FBG) for Structural Health Monitoring (SHM) have been studied extensively as they offer electrically passive operation, EMI immunity, high sensitivity, and multiple multiplexing schemes, as compared to conventional electricity based strain sensors. FBG sensors written in Polarization Maintaining (PM) optical fiber offer an additional dimension of strain measurement simplifying sensor implementation within a structure. This simplification however, adds complexity to the detection of the sensor’s optical response to its corresponding applied strain. We propose a modified Transfer Matrix Method model to simulate a fiber Bragg grating (FBG) in a polarization maintaining optical fiber. We study the effects of the reflected Bragg wavelength to the changes in shape of the optical fiber core waveguide and compare the results to the existing literature.
Karim, Hasanul; Delfin, Diego; Chavez, Luis A; Delfin, Luis; Martinez, Ricardo; Avila, Jose; Rodriguez, Carlos; Rumpf, Raymond C; Love, Norman; Lin, Yirong
Metamaterial based passive wireless temperature sensor Journal Article
In: Advanced Engineering Materials, vol. 19, no. 5, pp. 1600741, 2014, ISSN: 1438-1656.
Abstract | Links | BibTeX | Tags: closed ring resonators, metamaterials, passive wireless temperature sensor, sensors
@article{RN122,
title = {Metamaterial based passive wireless temperature sensor},
author = {Hasanul Karim and Diego Delfin and Luis A Chavez and Luis Delfin and Ricardo Martinez and Jose Avila and Carlos Rodriguez and Raymond C Rumpf and Norman Love and Yirong Lin},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adem.201600741},
issn = {1438-1656},
year = {2014},
date = {2014-02-14},
journal = {Advanced Engineering Materials},
volume = {19},
number = {5},
pages = {1600741},
abstract = {This paper presents the fabrication, modeling, and testing of a metamaterial based passive wireless temperature sensor consisting of an array of closed ring resonators (CRRs) embedded in a dielectric material matrix. A mixture of 70 vol% Boron Nitride (BN) and 30 vol% Barium Titanate (BTO) is used as the dielectric matrix and copper washers are used as CRRs. Conventional powder compression is used for the sensor fabrication. The feasibility of wireless temperature sensing is demonstrated up to 200 °C. The resonance frequency of the sensor decreases from 11.93 GHz at room temperature to 11.85 GHz at 200 °C, providing a sensitivity of 0.462 MHz °C. The repeatability of temperature sensing tests is carried out to quantify the repeatability. The highest standard deviation observed is 0.012 GHz at 200 °C.},
keywords = {closed ring resonators, metamaterials, passive wireless temperature sensor, sensors},
pubstate = {published},
tppubtype = {article}
}
This paper presents the fabrication, modeling, and testing of a metamaterial based passive wireless temperature sensor consisting of an array of closed ring resonators (CRRs) embedded in a dielectric material matrix. A mixture of 70 vol% Boron Nitride (BN) and 30 vol% Barium Titanate (BTO) is used as the dielectric matrix and copper washers are used as CRRs. Conventional powder compression is used for the sensor fabrication. The feasibility of wireless temperature sensing is demonstrated up to 200 °C. The resonance frequency of the sensor decreases from 11.93 GHz at room temperature to 11.85 GHz at 200 °C, providing a sensitivity of 0.462 MHz °C. The repeatability of temperature sensing tests is carried out to quantify the repeatability. The highest standard deviation observed is 0.012 GHz at 200 °C.
Digaum, Jennefir L; Pazos, Javier J; Chiles, Jeffrey; D’Archangel, Jeffrey; Padilla, Gabriel; Tatulian, Adrian; Rumpf, Raymond C; Fathpour, Sasan; Boreman, Glenn D; Kuebler, Stephen M
Tight control of light beams in photonic crystals with spatially-variant lattice orientation Journal Article
In: Optics express, vol. 22, no. 21, pp. 25788-25804, 2014, ISSN: 1094-4087.
Abstract | Links | BibTeX | Tags: low index materials, spatially variant photonic crystals
@article{RN93,
title = {Tight control of light beams in photonic crystals with spatially-variant lattice orientation},
author = {Jennefir L Digaum and Javier J Pazos and Jeffrey Chiles and Jeffrey D’Archangel and Gabriel Padilla and Adrian Tatulian and Raymond C Rumpf and Sasan Fathpour and Glenn D Boreman and Stephen M Kuebler},
url = {https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-22-21-25788&id=303042},
doi = {https://doi.org/10.1364/OE.22.025788},
issn = {1094-4087},
year = {2014},
date = {2014-02-01},
journal = {Optics express},
volume = {22},
number = {21},
pages = {25788-25804},
abstract = {Spatially-variant photonic crystals (SVPCs), in which the orientation of the unit cell changes as a function of position, are shown to be capable of abruptly controlling light beams using just low index materials and can be made to have high polarization selectivity. Multi-photon direct laser writing in the photo-polymer SU-8 was used to fabricate three-dimensional SVPCs that direct the flow of light around a 90 degree bend. The lattice spacing and fill factor were maintained nearly constant throughout the structure. The SVPCs were characterized at a wavelength of 2.94 μm by scanning the faces with optical fibers and the results were compared to electromagnetic simulations. The lattices were shown to direct infrared light of one polarization through sharp bends while the other polarization propagated straight through the SVPC. This work introduces a new scheme for controlling light that should be useful for integrated photonics.},
keywords = {low index materials, spatially variant photonic crystals},
pubstate = {published},
tppubtype = {article}
}
Spatially-variant photonic crystals (SVPCs), in which the orientation of the unit cell changes as a function of position, are shown to be capable of abruptly controlling light beams using just low index materials and can be made to have high polarization selectivity. Multi-photon direct laser writing in the photo-polymer SU-8 was used to fabricate three-dimensional SVPCs that direct the flow of light around a 90 degree bend. The lattice spacing and fill factor were maintained nearly constant throughout the structure. The SVPCs were characterized at a wavelength of 2.94 μm by scanning the faces with optical fibers and the results were compared to electromagnetic simulations. The lattices were shown to direct infrared light of one polarization through sharp bends while the other polarization propagated straight through the SVPC. This work introduces a new scheme for controlling light that should be useful for integrated photonics.
2013
Srimathi, Indumathi Raghu; Pung, Aaron J; Johnson, Eric G; Rumpf, Raymond C
Optical nano-hairs for micro-optical applications Proceedings Article
In: 2013 IEEE Photonics Conference, pp. 478-479, IEEE, 2013, ISBN: 1457715074.
Abstract | Links | BibTeX | Tags: metamaterials, micro-optiocs, optical diffraction, subwavelength structures
@inproceedings{RN86,
title = {Optical nano-hairs for micro-optical applications},
author = {Indumathi Raghu Srimathi and Aaron J Pung and Eric G Johnson and Raymond C Rumpf},
url = {https://ieeexplore.ieee.org/document/6656645},
doi = {10.1109/IPCon.2013.6656645},
isbn = {1457715074},
year = {2013},
date = {2013-09-08},
booktitle = {2013 IEEE Photonics Conference},
pages = {478-479},
publisher = {IEEE},
abstract = {The paper introduces optical nano-hair structures made from high-κ dielectrics that can be used to impart an arbitrary phase function to the transmitted beam. The concept behind the design of these new structures is elaborated.},
keywords = {metamaterials, micro-optiocs, optical diffraction, subwavelength structures},
pubstate = {published},
tppubtype = {inproceedings}
}
The paper introduces optical nano-hair structures made from high-κ dielectrics that can be used to impart an arbitrary phase function to the transmitted beam. The concept behind the design of these new structures is elaborated.
Rumpf, Raymond C; Garcia, Cesar R; Tsang, Harvey H; Padilla, Julio E; Irwin, Michael D
Electromagnetic isolation of a microstrip by embedding in a spatially variant anisotropic metamaterial Journal Article
In: Progress In Electromagnetics Research, vol. 142, pp. 243-260, 2013, ISSN: 1070-4698.
Abstract | Links | BibTeX | Tags: spatially variant anisotrpoic metamaterial (SVAM), spatially variant anisotrpoic metamaterial (SVAM)
@article{RN79,
title = {Electromagnetic isolation of a microstrip by embedding in a spatially variant anisotropic metamaterial},
author = {Raymond C Rumpf and Cesar R Garcia and Harvey H Tsang and Julio E Padilla and Michael D Irwin},
url = {https://www.jpier.org/PIER/pier.php?paper=13070308},
issn = {1070-4698},
year = {2013},
date = {2013-09-02},
journal = {Progress In Electromagnetics Research},
volume = {142},
pages = {243-260},
abstract = {The near-field surrounding devices can be arbitrarily sculpted if they are placed inside a spatially variant anisotropic metamaterial (SVAM). Our SVAMs are low loss because they do not contain metals and are extraordinarily broadband, working from DC up to a cutoff. In the present work, a microstrip transmission line was isolated from a metal object placed in close proximity by embedding it in an SVAM so that the field avoided the object. Our paper begins by outlining a simple finite-difference modeling approach for studying transmission lines embedded in SVAMs. We then present our design and experimental results to confirm the concept.},
keywords = {spatially variant anisotrpoic metamaterial (SVAM), spatially variant anisotrpoic metamaterial (SVAM)},
pubstate = {published},
tppubtype = {article}
}
The near-field surrounding devices can be arbitrarily sculpted if they are placed inside a spatially variant anisotropic metamaterial (SVAM). Our SVAMs are low loss because they do not contain metals and are extraordinarily broadband, working from DC up to a cutoff. In the present work, a microstrip transmission line was isolated from a metal object placed in close proximity by embedding it in an SVAM so that the field avoided the object. Our paper begins by outlining a simple finite-difference modeling approach for studying transmission lines embedded in SVAMs. We then present our design and experimental results to confirm the concept.
Deffenbaugh, Paul I; Rumpf, Raymond C; Church, Kenneth H
Broadband microwave frequency characterization of 3-D printed materials Journal Article
In: IEEE Transactions on Components, Packaging and Manufacturing Technology, vol. 3, no. 12, pp. 2147-2155, 2013, ISSN: 2156-3950.
Abstract | Links | BibTeX | Tags:
@article{RN85,
title = {Broadband microwave frequency characterization of 3-D printed materials},
author = {Paul I Deffenbaugh and Raymond C Rumpf and Kenneth H Church},
url = {https://ieeexplore.ieee.org/document/6574280},
doi = {10.1109/TCPMT.2013.2273306},
issn = {2156-3950},
year = {2013},
date = {2013-08-02},
urldate = {2013-08-02},
journal = {IEEE Transactions on Components, Packaging and Manufacturing Technology},
volume = {3},
number = {12},
pages = {2147-2155},
abstract = {3-D printing allows increased design flexibility in the fabrication of microwave circuits and devices and is reaching a level of maturity that allows for functional parts. Little is known about the RF and microwave properties of the standard materials that have been developed for 3-D printing. This paper measures a wide variety of materials over a broad spectrum of frequencies from 1 MHz to 10 GHz using a variety of well-established measurement methods.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
3-D printing allows increased design flexibility in the fabrication of microwave circuits and devices and is reaching a level of maturity that allows for functional parts. Little is known about the RF and microwave properties of the standard materials that have been developed for 3-D printing. This paper measures a wide variety of materials over a broad spectrum of frequencies from 1 MHz to 10 GHz using a variety of well-established measurement methods.
May, Russell; Rumpf, Raymond; Coggin, John; Davis, Williams; Yang, Taeyoung; O'Donnell, Alan; Bresnahan, Peter
Ultra-High Temperature Distributed Wireless Sensors Technical Report
Prime Photonics, Lc 2013.
Abstract | Links | BibTeX | Tags:
@techreport{RN91,
title = {Ultra-High Temperature Distributed Wireless Sensors},
author = {Russell May and Raymond Rumpf and John Coggin and Williams Davis and Taeyoung Yang and Alan O'Donnell and Peter Bresnahan},
url = {https://www.osti.gov/servlets/purl/1116992/},
year = {2013},
date = {2013-06-15},
urldate = {2013-06-15},
institution = {Prime Photonics, Lc},
abstract = {Research was conducted towards the development of a passive wireless sensor for
measurement of temperature in coal gasifiers and coal-fired boiler plants. Approaches
investigated included metamaterial sensors based on guided mode resonance filters, and
temperature-sensitive antennas that modulate the frequency of incident radio waves as they are
re-radiated by the antenna.
In the guided mode resonant filter metamaterial approach, temperature is encoded as
changes in the sharpness of the filter response, which changes with temperature because the
dielectric loss of the guided mode resonance filter is temperature-dependent.
In the mechanically modulated antenna approach, the resonant frequency of a vibrating
cantilever beam attached to the antenna changes with temperature. The vibration of the beam
perturbs the electrical impedance of the antenna, so that incident radio waves are phase
modulated at a frequency equal to the resonant frequency of the vibrating beam. Since the beam
resonant frequency depends on temperature, a Doppler radar can be used to remotely measure
the temperature of the antenna.
Laboratory testing of the guided mode resonance filter failed to produce the spectral
response predicted by simulations. It was concluded that the spectral response was dominated by
spectral reflections of radio waves incident on the filter.
Laboratory testing of the mechanically modulated antenna demonstrated that the device
frequency shifted incident radio waves, and that the frequency of the re-radiated waves varied
linearly with temperature.
Radio wave propagation tests in the convection pass of a small research boiler plant
identified a spectral window between 10 and 13 GHz for low loss propagation of radio waves in
the interior of the boiler.},
keywords = {},
pubstate = {published},
tppubtype = {techreport}
}
Research was conducted towards the development of a passive wireless sensor for
measurement of temperature in coal gasifiers and coal-fired boiler plants. Approaches
investigated included metamaterial sensors based on guided mode resonance filters, and
temperature-sensitive antennas that modulate the frequency of incident radio waves as they are
re-radiated by the antenna.
In the guided mode resonant filter metamaterial approach, temperature is encoded as
changes in the sharpness of the filter response, which changes with temperature because the
dielectric loss of the guided mode resonance filter is temperature-dependent.
In the mechanically modulated antenna approach, the resonant frequency of a vibrating
cantilever beam attached to the antenna changes with temperature. The vibration of the beam
perturbs the electrical impedance of the antenna, so that incident radio waves are phase
modulated at a frequency equal to the resonant frequency of the vibrating beam. Since the beam
resonant frequency depends on temperature, a Doppler radar can be used to remotely measure
the temperature of the antenna.
Laboratory testing of the guided mode resonance filter failed to produce the spectral
response predicted by simulations. It was concluded that the spectral response was dominated by
spectral reflections of radio waves incident on the filter.
Laboratory testing of the mechanically modulated antenna demonstrated that the device
frequency shifted incident radio waves, and that the frequency of the re-radiated waves varied
linearly with temperature.
Radio wave propagation tests in the convection pass of a small research boiler plant
identified a spectral window between 10 and 13 GHz for low loss propagation of radio waves in
the interior of the boiler.
measurement of temperature in coal gasifiers and coal-fired boiler plants. Approaches
investigated included metamaterial sensors based on guided mode resonance filters, and
temperature-sensitive antennas that modulate the frequency of incident radio waves as they are
re-radiated by the antenna.
In the guided mode resonant filter metamaterial approach, temperature is encoded as
changes in the sharpness of the filter response, which changes with temperature because the
dielectric loss of the guided mode resonance filter is temperature-dependent.
In the mechanically modulated antenna approach, the resonant frequency of a vibrating
cantilever beam attached to the antenna changes with temperature. The vibration of the beam
perturbs the electrical impedance of the antenna, so that incident radio waves are phase
modulated at a frequency equal to the resonant frequency of the vibrating beam. Since the beam
resonant frequency depends on temperature, a Doppler radar can be used to remotely measure
the temperature of the antenna.
Laboratory testing of the guided mode resonance filter failed to produce the spectral
response predicted by simulations. It was concluded that the spectral response was dominated by
spectral reflections of radio waves incident on the filter.
Laboratory testing of the mechanically modulated antenna demonstrated that the device
frequency shifted incident radio waves, and that the frequency of the re-radiated waves varied
linearly with temperature.
Radio wave propagation tests in the convection pass of a small research boiler plant
identified a spectral window between 10 and 13 GHz for low loss propagation of radio waves in
the interior of the boiler.
Garcia, CR; Rumpf, RC; Tsang, HH; Barton, JH
Effects of extreme surface roughness on 3D printed horn antenna Journal Article
In: Electronics letters, vol. 49, no. 12, pp. 734-736, 2013, ISSN: 1350-911X.
Abstract | Links | BibTeX | Tags: 3D printing, electron beam melting, surface finish, surface roughness
@article{RN77,
title = {Effects of extreme surface roughness on 3D printed horn antenna},
author = {CR Garcia and RC Rumpf and HH Tsang and JH Barton},
url = {https://ietresearch.onlinelibrary.wiley.com/doi/10.1049/el.2013.1528},
doi = {https://doi.org/10.1049/el.2013.1528},
issn = {1350-911X},
year = {2013},
date = {2013-06-01},
journal = {Electronics letters},
volume = {49},
number = {12},
pages = {734-736},
abstract = {3D printing is an emerging technology in manufacturing. It is the long-term goal of the industry to print complex and fully functional products from cell phones to vehicles. A drawback of many 3D printing technologies is rough surface finish. It is known that metals with high surface roughness severely degrade the propagation of electromagnetic waves. Presented is the first known evaluation of the electromagnetic impact of the typical surface roughness in metal parts produced by electron beam melting. Two Ku-band (12–15 GHz) horn antennas were 3D printed, with different surface roughness, and compared to a standard horn antenna purchased from Pasternack.},
keywords = {3D printing, electron beam melting, surface finish, surface roughness},
pubstate = {published},
tppubtype = {article}
}
3D printing is an emerging technology in manufacturing. It is the long-term goal of the industry to print complex and fully functional products from cell phones to vehicles. A drawback of many 3D printing technologies is rough surface finish. It is known that metals with high surface roughness severely degrade the propagation of electromagnetic waves. Presented is the first known evaluation of the electromagnetic impact of the typical surface roughness in metal parts produced by electron beam melting. Two Ku-band (12–15 GHz) horn antennas were 3D printed, with different surface roughness, and compared to a standard horn antenna purchased from Pasternack.
Rumpf, Raymond C; Gates, Marvin; Kozikowski, Carrie L; Davis, William A
Guided-mode resonance filter compensated to operate on a curved surface Journal Article
In: Progress In Electromagnetics Research C, vol. 40, pp. 93-103, 2013, ISSN: 1937-8718.
Abstract | Links | BibTeX | Tags: curved surface, GMRF, guided mode resonance (GMR)
@article{RN74,
title = {Guided-mode resonance filter compensated to operate on a curved surface},
author = {Raymond C Rumpf and Marvin Gates and Carrie L Kozikowski and William A Davis},
url = {https://www.jpier.org/pierc/pier.php?paper=13041209},
doi = {10.2528/PIERC13041209},
issn = {1937-8718},
year = {2013},
date = {2013-05-23},
journal = {Progress In Electromagnetics Research C},
volume = {40},
pages = {93-103},
abstract = {Guided-mode resonance filters (GMRFs) are highly compact structures that can produce a strong frequency response from a single thin layer of dielectric. When a GMRF is formed onto a curved surface, the local angle of incidence varies over the aperture of the device and the overall performance significantly degrades. In the present work, we spatially varied the grating period of a curved GMRF to perfectly compensate for the local angle of incidence. The performance of the curved device actually surpassed that of a flat device because it also compensated for the spherical wave front from the source. This paper summarizes our design process and experimental results obtained around 25 GHz.},
keywords = {curved surface, GMRF, guided mode resonance (GMR)},
pubstate = {published},
tppubtype = {article}
}
Guided-mode resonance filters (GMRFs) are highly compact structures that can produce a strong frequency response from a single thin layer of dielectric. When a GMRF is formed onto a curved surface, the local angle of incidence varies over the aperture of the device and the overall performance significantly degrades. In the present work, we spatially varied the grating period of a curved GMRF to perfectly compensate for the local angle of incidence. The performance of the curved device actually surpassed that of a flat device because it also compensated for the spherical wave front from the source. This paper summarizes our design process and experimental results obtained around 25 GHz.
Rumpf, Raymond C; Pazos, Javier J
Optimization of planar self-collimating photonic crystals Journal Article
In: JOSA A, vol. 30, no. 7, pp. 1297-1304, 2013, ISSN: 1520-8532.
Abstract | Links | BibTeX | Tags: figure of merit, photonic crystals, self-collimation, silicon photonics, spatially variant photonic crystals
@article{RN73,
title = {Optimization of planar self-collimating photonic crystals},
author = {Raymond C Rumpf and Javier J Pazos},
url = {https://www.osapublishing.org/josaa/abstract.cfm?uri=josaa-30-7-1297#articleBody},
doi = {https://doi.org/10.1364/JOSAA.30.001297},
issn = {1520-8532},
year = {2013},
date = {2013-05-01},
journal = {JOSA A},
volume = {30},
number = {7},
pages = {1297-1304},
abstract = {Self-collimation in photonic crystals has received a lot of attention in the literature, partly due to recent interest in silicon photonics, yet no performance metrics have been proposed. This paper proposes a figure of merit (FOM) for self-collimation and outlines a methodical approach for calculating it. Performance metrics include bandwidth, angular acceptance, strength, and an overall FOM. Two key contributions of this work include the performance metrics and identifying that the optimum frequency for self-collimation is not at the inflection point. The FOM is used to optimize a planar photonic crystal composed of a square array of cylinders. Conclusions are drawn about how the refractive indices and fill fraction of the lattice impact each of the performance metrics. The optimization is demonstrated by simulating two spatially variant self-collimating photonic crystals, where one has a high FOM and the other has a low FOM. This work gives optical designers tremendous insight into how to design and optimize robust self-collimating photonic crystals, which promises many applications in silicon photonics and integrated optics.},
keywords = {figure of merit, photonic crystals, self-collimation, silicon photonics, spatially variant photonic crystals},
pubstate = {published},
tppubtype = {article}
}
Self-collimation in photonic crystals has received a lot of attention in the literature, partly due to recent interest in silicon photonics, yet no performance metrics have been proposed. This paper proposes a figure of merit (FOM) for self-collimation and outlines a methodical approach for calculating it. Performance metrics include bandwidth, angular acceptance, strength, and an overall FOM. Two key contributions of this work include the performance metrics and identifying that the optimum frequency for self-collimation is not at the inflection point. The FOM is used to optimize a planar photonic crystal composed of a square array of cylinders. Conclusions are drawn about how the refractive indices and fill fraction of the lattice impact each of the performance metrics. The optimization is demonstrated by simulating two spatially variant self-collimating photonic crystals, where one has a high FOM and the other has a low FOM. This work gives optical designers tremendous insight into how to design and optimize robust self-collimating photonic crystals, which promises many applications in silicon photonics and integrated optics.
Srimathi, I. R.; Pung, A. J.; Li, Y.; Rumpf, R. C.; Johnson, E. G.
Fabrication of metal-oxide nano-hairs for effective index optical elements Journal Article
In: Opt Express, vol. 21, no. 16, pp. 18733-41, 2013, ISSN: 1094-4087, (1094-4087 Srimathi, Indumathi Raghu Pung, Aaron J Li, Yuan Rumpf, Raymond C Johnson, Eric G Journal Article Research Support, U.S. Gov't, Non-P.H.S. United States 2013/08/14 Opt Express. 2013 Aug 12;21(16):18733-41. doi: 10.1364/OE.21.018733.).
Abstract | Links | BibTeX | Tags:
@article{RN17,
title = {Fabrication of metal-oxide nano-hairs for effective index optical elements},
author = {I. R. Srimathi and A. J. Pung and Y. Li and R. C. Rumpf and E. G. Johnson},
doi = {10.1364/oe.21.018733},
issn = {1094-4087},
year = {2013},
date = {2013-05-01},
journal = {Opt Express},
volume = {21},
number = {16},
pages = {18733-41},
abstract = {We present a method for fabricating high aspect ratio metal-oxide, sub-wavelength grating structures. These "nano-hair" structures are composed of alumina cylindrical pillars, partially embedded in a supporting fused silica substrate. The fabricated nano-hair structures demonstrate phase control of the transmitted beam while maintaining a peak transmitted power greater than 93% around a central wavelength of λ(o) = 1.55 µm. Based on this principle, discrete and continuous phase functions can be encoded by controlling the lithographic process.},
note = {1094-4087
Srimathi, Indumathi Raghu
Pung, Aaron J
Li, Yuan
Rumpf, Raymond C
Johnson, Eric G
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
United States
2013/08/14
Opt Express. 2013 Aug 12;21(16):18733-41. doi: 10.1364/OE.21.018733.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We present a method for fabricating high aspect ratio metal-oxide, sub-wavelength grating structures. These "nano-hair" structures are composed of alumina cylindrical pillars, partially embedded in a supporting fused silica substrate. The fabricated nano-hair structures demonstrate phase control of the transmitted beam while maintaining a peak transmitted power greater than 93% around a central wavelength of λ(o) = 1.55 µm. Based on this principle, discrete and continuous phase functions can be encoded by controlling the lithographic process.
Srimathi, Indumathi Raghu; Pung, Aaron J; Li, Yuan; Rumpf, Raymond C; Johnson, Eric G
Fabrication of metal-oxide nano-hairs for effective index optical elements Journal Article
In: Optics express, vol. 21, no. 16, pp. 18733-18741, 2013, ISSN: 1094-4087.
Abstract | Links | BibTeX | Tags:
@article{RN82,
title = {Fabrication of metal-oxide nano-hairs for effective index optical elements},
author = {Indumathi Raghu Srimathi and Aaron J Pung and Yuan Li and Raymond C Rumpf and Eric G Johnson},
url = {https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-21-16-18733&id=259842},
issn = {1094-4087},
year = {2013},
date = {2013-05-01},
journal = {Optics express},
volume = {21},
number = {16},
pages = {18733-18741},
abstract = {We present a method for fabricating high aspect ratio metal-oxide, sub-wavelength grating structures. These “nano-hair†structures are composed of alumina cylindrical pillars, partially embedded in a supporting fused silica substrate. The fabricated nano-hair structures demonstrate phase control of the transmitted beam while maintaining a peak transmitted power greater than 93% around a central wavelength of λ o  = 1.55 µm. Based on this principle, discrete and continuous phase functions can be encoded by controlling the lithographic process.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We present a method for fabricating high aspect ratio metal-oxide, sub-wavelength grating structures. These “nano-hair†structures are composed of alumina cylindrical pillars, partially embedded in a supporting fused silica substrate. The fabricated nano-hair structures demonstrate phase control of the transmitted beam while maintaining a peak transmitted power greater than 93% around a central wavelength of λ o  = 1.55 µm. Based on this principle, discrete and continuous phase functions can be encoded by controlling the lithographic process.
Church, Kenneth H; Tsang, Harvey; Rodriguez, Ricardo; Defembaugh, Paul; Rumpf, Raymond
Printed Circuit Structures, the Evolution of Printed Circuit Boards Journal Article
In: Proc. IPC Apex EXPO, vol. 2, 2013.
Abstract | Links | BibTeX | Tags: 3D printed circuits, printed circuit structure
@article{RN83,
title = {Printed Circuit Structures, the Evolution of Printed Circuit Boards},
author = {Kenneth H Church and Harvey Tsang and Ricardo Rodriguez and Paul Defembaugh and Raymond Rumpf},
url = {https://www.researchgate.net/publication/260870514_Printed_Circuit_Structures_the_Evolution_of_Printed_Circuit_Boards},
year = {2013},
date = {2013-02-01},
booktitle = {IPC APEX EXPO Conference Proceedings},
journal = {Proc. IPC Apex EXPO},
volume = {2},
abstract = {The printed circuit board is the backbone of electronics and a large number of consumer devices. The challenge to put more function in a smaller space requires more components utilizing smaller bond pads, smaller lines and tighter pitch. The electronic packaging industry has aggressively pursued novel ways to shrink and stack multilayer boards inside smaller volumes. The industry is approaching serious obstacles in the continued size reduction requirements with the need for wires, epoxy, vias, solder and sometimes bolts and screws to mount the boards. The next logical step is to move beyond 2D stacking, which is 2.5D, to make 3D packages and to utilize the third dimension directly. Eliminate the traditional 2D FR-4 board and the wires, epoxies, vias and solder and make the next-generation packages utilizing 3D: the printed circuit structure (PCS). The PCS concept will allow passives, actives and even antennas to move out of the XY plane and into the XZ and YZ planes. This new dimension will appear to be very complex and next-generation circuit optimization will be required, but the end result will net a significant improvement in volume utilization. In addition, if new materials are developed and utilized properly, the PCS will be the box or the package, thus eliminating all the bolts and screws necessary to mount a PCB in a traditional box or package, saving space and reducing weight. In this paper, nScrypt and the University of Texas at El Paso will present 3D printing of printed circuit structures. A demonstration of true 3D electronic structures will be demonstrated and shown as well as novel approaches that utilize CAD to 3D printing, including the electronics portion.},
keywords = {3D printed circuits, printed circuit structure},
pubstate = {published},
tppubtype = {article}
}
The printed circuit board is the backbone of electronics and a large number of consumer devices. The challenge to put more function in a smaller space requires more components utilizing smaller bond pads, smaller lines and tighter pitch. The electronic packaging industry has aggressively pursued novel ways to shrink and stack multilayer boards inside smaller volumes. The industry is approaching serious obstacles in the continued size reduction requirements with the need for wires, epoxy, vias, solder and sometimes bolts and screws to mount the boards. The next logical step is to move beyond 2D stacking, which is 2.5D, to make 3D packages and to utilize the third dimension directly. Eliminate the traditional 2D FR-4 board and the wires, epoxies, vias and solder and make the next-generation packages utilizing 3D: the printed circuit structure (PCS). The PCS concept will allow passives, actives and even antennas to move out of the XY plane and into the XZ and YZ planes. This new dimension will appear to be very complex and next-generation circuit optimization will be required, but the end result will net a significant improvement in volume utilization. In addition, if new materials are developed and utilized properly, the PCS will be the box or the package, thus eliminating all the bolts and screws necessary to mount a PCB in a traditional box or package, saving space and reducing weight. In this paper, nScrypt and the University of Texas at El Paso will present 3D printing of printed circuit structures. A demonstration of true 3D electronic structures will be demonstrated and shown as well as novel approaches that utilize CAD to 3D printing, including the electronics portion.
Rumpf, Raymond C; Pazos, Javier; Garcia, Cesar R; Ochoa, Luis; Wicker, Ryan
3D printed lattices with spatially variant self-collimation Journal Article
In: Progress In Electromagnetics Research, vol. 139, pp. 1-14, 2013, ISSN: 1070-4698.
Abstract | Links | BibTeX | Tags: 3D printing, self-collimation, spatially variant
@article{RN70,
title = {3D printed lattices with spatially variant self-collimation},
author = {Raymond C Rumpf and Javier Pazos and Cesar R Garcia and Luis Ochoa and Ryan Wicker},
url = {https://www.jpier.org/PIER/pier139/01.13030507.pdf},
issn = {1070-4698},
year = {2013},
date = {2013-01-01},
journal = {Progress In Electromagnetics Research},
volume = {139},
pages = {1-14},
abstract = {In this work, results are given for controlling waves arbitrarily inside a lattice with spatially variant self-collimation. To demonstrate the concept, an unguided beam was made to flow around a 90 deg bend without scattering due to the bend or the spatial variance. Control of the field was achieved by spatially varying the orientation of the unit cells throughout a self-collimating photonic crystal, but in a manner that almost completely eliminated deformations to the size and shape of the unit cells. The device was all-dielectric, monolithic, and made from an ordinary dielectric with low relative permittivity (εr = 2.45). It was manufactured by fused deposition modeling, a form of 3D printing, and its performance confirmed experimentally at
around 15 GHz.},
keywords = {3D printing, self-collimation, spatially variant},
pubstate = {published},
tppubtype = {article}
}
In this work, results are given for controlling waves arbitrarily inside a lattice with spatially variant self-collimation. To demonstrate the concept, an unguided beam was made to flow around a 90 deg bend without scattering due to the bend or the spatial variance. Control of the field was achieved by spatially varying the orientation of the unit cells throughout a self-collimating photonic crystal, but in a manner that almost completely eliminated deformations to the size and shape of the unit cells. The device was all-dielectric, monolithic, and made from an ordinary dielectric with low relative permittivity (εr = 2.45). It was manufactured by fused deposition modeling, a form of 3D printing, and its performance confirmed experimentally at
around 15 GHz.
around 15 GHz.
2012
Bilal, O. R.; Guo, Q.; Rumpf, R. C.; Hussein, M. I.
Ultrafast Band Structure Calculation for Photonic Crystals and Metamaterials Presentation
15.06.2012.
@misc{RN161,
title = {Ultrafast Band Structure Calculation for Photonic Crystals and Metamaterials},
author = {O. R. Bilal and Q. Guo and R. C. Rumpf and M. I. Hussein},
year = {2012},
date = {2012-06-15},
urldate = {2012-06-15},
abstract = {PECS-X 10th Int. Symposium on Photonic and Electromagnetic Crystal Structures, Sante Fe, New Mexico, June 2012},
keywords = {},
pubstate = {published},
tppubtype = {presentation}
}
PECS-X 10th Int. Symposium on Photonic and Electromagnetic Crystal Structures, Sante Fe, New Mexico, June 2012
Barton, Jay H; Rumpf, Raymond C; Smith, Randall W; Kozikowski, Carrie L; Zellner, Phillip A
All-dielectric frequency selective surfaces with few number of periods Journal Article
In: Progress In Electromagnetics Research B, vol. 41, pp. 269-283, 2012, ISSN: 1937-6472.
Abstract | Links | BibTeX | Tags: frequency selective surface (FSS), frequency selective surface (FSS), GMR, guided mode resonance (GMR)
@article{RN71,
title = {All-dielectric frequency selective surfaces with few number of periods},
author = {Jay H Barton and Raymond C Rumpf and Randall W Smith and Carrie L Kozikowski and Phillip A Zellner},
url = {https://www.jpier.org/pierb/pier.php?paper=12042404},
doi = {10.2528/PIERB12042404},
issn = {1937-6472},
year = {2012},
date = {2012-06-11},
urldate = {2012-06-11},
journal = {Progress In Electromagnetics Research B},
volume = {41},
pages = {269-283},
abstract = {All-dielectric frequency selective surfaces (FSSs) can serve as an alternative to their metallic counterparts when they must operate at very high power, loss must be minimized, or when the surface itself must be low observable. When metals are avoided, there is a weaker interaction with electromagnetic waves and it becomes more difficult to achieve strong suppression in the stop band while also realizing compact size, wide field-of-view or broadband operation. One attractive approach utilizes guided-mode resonance (GMR) as the filtering mechanism, but this phenomenon exhibits several drawbacks that must be overcome for practical application at radio frequencies. This paper introduces the concept of guide-mode resonance for FSSs and describes how they can be made to operate with a dramatically fewer number of periods than conventional GMR devices.},
keywords = {frequency selective surface (FSS), frequency selective surface (FSS), GMR, guided mode resonance (GMR)},
pubstate = {published},
tppubtype = {article}
}
All-dielectric frequency selective surfaces (FSSs) can serve as an alternative to their metallic counterparts when they must operate at very high power, loss must be minimized, or when the surface itself must be low observable. When metals are avoided, there is a weaker interaction with electromagnetic waves and it becomes more difficult to achieve strong suppression in the stop band while also realizing compact size, wide field-of-view or broadband operation. One attractive approach utilizes guided-mode resonance (GMR) as the filtering mechanism, but this phenomenon exhibits several drawbacks that must be overcome for practical application at radio frequencies. This paper introduces the concept of guide-mode resonance for FSSs and describes how they can be made to operate with a dramatically fewer number of periods than conventional GMR devices.
Kuebler, Stephen M; Williams, Henry E; Freppon, Daniel J; Rumpf, Raymond C
Fabrication of polymeric micro-photonic structures on the tip of optical fibers Proceedings Article
In: Specialty Optical Fibers, pp. STu1D. 3, Optical Society of America, 2012.
Abstract | Links | BibTeX | Tags: 3D micro-photonic structures
@inproceedings{RN88,
title = {Fabrication of polymeric micro-photonic structures on the tip of optical fibers},
author = {Stephen M Kuebler and Henry E Williams and Daniel J Freppon and Raymond C Rumpf},
url = {https://www.osapublishing.org/abstract.cfm?URI=SOF-2012-STu1D.3},
doi = {https://doi.org/10.1364/SOF.2012.STu1D.3},
year = {2012},
date = {2012-05-01},
booktitle = {Specialty Optical Fibers},
pages = {STu1D. 3},
publisher = {Optical Society of America},
abstract = {A method is described for fabricating truly three-dimensional micro-photonic structures directly onto the end face of an optical fiber.},
keywords = {3D micro-photonic structures},
pubstate = {published},
tppubtype = {inproceedings}
}
A method is described for fabricating truly three-dimensional micro-photonic structures directly onto the end face of an optical fiber.
Rumpf, Raymond C; Pazos, Javier
Synthesis of spatially variant lattices Journal Article
In: Optics express, vol. 20, no. 14, pp. 15263-15274, 2012, ISSN: 1094-4087.
Abstract | Links | BibTeX | Tags: photonic crystals, self-collimation, spatially variant lattice
@article{RN51,
title = {Synthesis of spatially variant lattices},
author = {Raymond C Rumpf and Javier Pazos},
url = {https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-20-14-15263&id=239020},
doi = {https://doi.org/10.1364/OE.20.015263},
issn = {1094-4087},
year = {2012},
date = {2012-04-01},
journal = {Optics express},
volume = {20},
number = {14},
pages = {15263-15274},
abstract = {It is often desired to functionally grade and/or spatially vary a periodic structure like a photonic crystal or metamaterial, yet no general method for doing this has been offered in the literature. A straightforward procedure is described here that allows many properties of the lattice to be spatially varied at the same time while producing a final lattice that is still smooth and continuous. Properties include unit cell orientation, lattice spacing, fill fraction, and more. This adds many degrees of freedom to a design such as spatially varying the orientation to exploit directional phenomena. The method is not a coordinate transformation technique so it can more easily produce complicated and arbitrary spatial variance. To demonstrate, the algorithm is used to synthesize a spatially variant self-collimating photonic crystal to flow a Gaussian beam around a 90° bend. The performance of the structure was confirmed through simulation and it showed virtually no scattering around the bend that would have arisen if the lattice had defects or discontinuities.},
keywords = {photonic crystals, self-collimation, spatially variant lattice},
pubstate = {published},
tppubtype = {article}
}
It is often desired to functionally grade and/or spatially vary a periodic structure like a photonic crystal or metamaterial, yet no general method for doing this has been offered in the literature. A straightforward procedure is described here that allows many properties of the lattice to be spatially varied at the same time while producing a final lattice that is still smooth and continuous. Properties include unit cell orientation, lattice spacing, fill fraction, and more. This adds many degrees of freedom to a design such as spatially varying the orientation to exploit directional phenomena. The method is not a coordinate transformation technique so it can more easily produce complicated and arbitrary spatial variance. To demonstrate, the algorithm is used to synthesize a spatially variant self-collimating photonic crystal to flow a Gaussian beam around a 90° bend. The performance of the structure was confirmed through simulation and it showed virtually no scattering around the bend that would have arisen if the lattice had defects or discontinuities.
Pung, Aaron J; Poutous, Menelaos K; Rumpf, Raymond C; Roth, Zachary A; Johnson, Eric G
Fabrication of optically monolithic, low-index guided mode resonance filters Proceedings
International Society for Optics and Photonics, vol. 8249, 2012.
Abstract | Links | BibTeX | Tags: etching, guided mode resonance (GMR), spectral based filter, waveguide
@proceedings{RN61,
title = {Fabrication of optically monolithic, low-index guided mode resonance filters},
author = {Aaron J Pung and Menelaos K Poutous and Raymond C Rumpf and Zachary A Roth and Eric G Johnson},
url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/8249/1/Fabrication-of-optically-monolithic-low-index-guided-mode-resonance-filters/10.1117/12.908582.short},
doi = {https://doi.org/10.1117/12.908582},
year = {2012},
date = {2012-02-08},
booktitle = {Advanced Fabrication Technologies for Micro/Nano Optics and Photonics V},
volume = {8249},
pages = {82490F},
publisher = {International Society for Optics and Photonics},
abstract = {This paper presents a narrow spectral filter based on a monolithic material system. Guided-mode resonance is achieved by embedding a periodic array of air holes within a similar-index material. Microvoids created in the lowindex substrate during deposition of the waveguide give a relatively high index contrast for guided-mode resonance. One and two-dimensional gratings are used to examine polarization dependence of the device. Theoretical and experimental results are provided, demonstrating a roughly six nanometer resonance at the full width half-maximum for both geometries.},
keywords = {etching, guided mode resonance (GMR), spectral based filter, waveguide},
pubstate = {published},
tppubtype = {proceedings}
}
This paper presents a narrow spectral filter based on a monolithic material system. Guided-mode resonance is achieved by embedding a periodic array of air holes within a similar-index material. Microvoids created in the lowindex substrate during deposition of the waveguide give a relatively high index contrast for guided-mode resonance. One and two-dimensional gratings are used to examine polarization dependence of the device. Theoretical and experimental results are provided, demonstrating a roughly six nanometer resonance at the full width half-maximum for both geometries.