2021
Xia, Chun; Kuebler, Stephen M; Martinez, Noel P; Martinez, Manuel; Rumpf, Raymond C; Touma, Jimmy
Wide-band self-collimation in a low-refractive-index hexagonal lattice Journal Article
In: Optics Letters, vol. 46, no. 9, pp. 2228-2231, 2021.
Abstract | Links | BibTeX | Tags: hexagonal, multiphoton lithography, photonic crystals, self-collimation
@article{nokey,
title = {Wide-band self-collimation in a low-refractive-index hexagonal lattice},
author = {Chun Xia and Stephen M Kuebler and Noel P Martinez and Manuel Martinez and Raymond C Rumpf and Jimmy Touma
},
url = {https://www.osapublishing.org/ol/abstract.cfm?uri=ol-46-9-2228},
doi = {10.1364/OL.421860},
year = {2021},
date = {2021-05-01},
urldate = {2021-05-01},
journal = {Optics Letters},
volume = {46},
number = {9},
pages = {2228-2231},
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.},
keywords = {hexagonal, multiphoton lithography, photonic crystals, self-collimation},
pubstate = {published},
tppubtype = {article}
}
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.
2015
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 Proceeding
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.
2014
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 Proceeding
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.
2013
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.
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.