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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 8 — Apr. 16, 2007
  • pp: 4735–4744

Design of generalized invisible scatterers

Raymond C. Rumpf, Michael A. Fiddy, and Markus E. Testorf  »View Author Affiliations


Optics Express, Vol. 15, Issue 8, pp. 4735-4744 (2007)
http://dx.doi.org/10.1364/OE.15.004735


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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.

© 2007 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(100.3190) Image processing : Inverse problems

ToC Category:
Materials

History
Original Manuscript: February 7, 2007
Revised Manuscript: March 11, 2007
Manuscript Accepted: March 13, 2007
Published: April 4, 2007

Citation
Raymond C. Rumpf, Michael A. Fiddy, and Markus E. Testorf, "Design of generalized invisible scatterers," Opt. Express 15, 4735-4744 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-8-4735


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