2007
Rumpf, Raymond C; Fiddy, Michael A; Testorf, Markus E
Design of generalized invisible scatterers Journal Article
In: Optics express, vol. 15, no. 8, pp. 4735-4744, 2007, ISSN: 1094-4087.
Abstract | Links | BibTeX | Tags: cepstral filtering, diffractive optics, electromagnetic cloaking, forward scattering, k-space design, nonlinear optical signal
@article{RN38,
title = {Design of generalized invisible scatterers},
author = {Raymond C Rumpf and Michael A Fiddy and Markus E Testorf},
url = {https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-15-8-4735&id=131871},
doi = {https://doi.org/10.1364/OE.15.004735},
issn = {1094-4087},
year = {2007},
date = {2007-01-01},
journal = {Optics express},
volume = {15},
number = {8},
pages = {4735-4744},
abstract = {A nonlinear signal processing method is applied to the design of strongly scattering objects to realize a defined angular response. Investigated as the complement of inverse scattering problems, k -space design methods are combined with cepstral filtering to obtain a permittivity distribution that scatters with the desired response. Starting with the rigorously computed angular spectrum of the scattering amplitude of an object of simple geometric shape, the corresponding k -space is modified to provide the desired scattering behavior. In order to account for strong scattering, cepstral filtering is applied to map the associated distribution of secondary sources to a unique permittivity distribution. The inversion process results in a structure that exhibits the desired properties and which can be interpreted as a perturbation of the initial structure. Simulation results are presented which illustrate the usefulness of this method. In particular, objects are modified to enhance forward scattering and suppress scattering in all other direction. Results are verified using a rigorous finite-difference frequency-domain scheme to simulate scattering. The method is demonstrated as a novel means for designing invisible objects that act as electromagnetic cloaks.},
keywords = {cepstral filtering, diffractive optics, electromagnetic cloaking, forward scattering, k-space design, nonlinear optical signal},
pubstate = {published},
tppubtype = {article}
}
A nonlinear signal processing method is applied to the design of strongly scattering objects to realize a defined angular response. Investigated as the complement of inverse scattering problems, k -space design methods are combined with cepstral filtering to obtain a permittivity distribution that scatters with the desired response. Starting with the rigorously computed angular spectrum of the scattering amplitude of an object of simple geometric shape, the corresponding k -space is modified to provide the desired scattering behavior. In order to account for strong scattering, cepstral filtering is applied to map the associated distribution of secondary sources to a unique permittivity distribution. The inversion process results in a structure that exhibits the desired properties and which can be interpreted as a perturbation of the initial structure. Simulation results are presented which illustrate the usefulness of this method. In particular, objects are modified to enhance forward scattering and suppress scattering in all other direction. Results are verified using a rigorous finite-difference frequency-domain scheme to simulate scattering. The method is demonstrated as a novel means for designing invisible objects that act as electromagnetic cloaks.