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On uniqueness in electromagnetic scattering from biperiodic structures

Published online by Cambridge University Press:  17 June 2013

Armin Lechleiter
Affiliation:
Center for Industrial Mathematics, University of Bremen, 28359 Bremen, Germany. . lechleiter@math.uni-bremen.de
Dinh-Liem Nguyen
Affiliation:
DEFI, INRIA Saclay–Ile-de-France and Ecole Polytechnique, 91128 Palaiseau, France. ; dnguyen@cmap.polytechnique.fr
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Abstract

Consider time-harmonic electromagnetic wave scattering from a biperiodic dielectric structure mounted on a perfectly conducting plate in three dimensions. Given that uniqueness of solution holds, existence of solution follows from a well-known Fredholm framework for the variational formulation of the problem in a suitable Sobolev space. In this paper, we derive a Rellich identity for a solution to this variational problem under suitable smoothness conditions on the material parameter. Under additional non-trapping assumptions on the material parameter, this identity allows us to establish uniqueness of solution for all positive wave numbers.

Type
Research Article
Copyright
© EDP Sciences, SMAI, 2013

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