• Media type: Text; E-Article
  • Title: Conical diffraction by multilayer gratings: a recursive integral equation approach
  • Contributor: Schmidt, Gunther [Author]
  • Published: Weierstrass Institute for Applied Analysis and Stochastics publication server, 2013
  • Language: English
  • DOI: https://doi.org/10.1007/s10492-013-0014-6
  • Keywords: Diffraction -- periodic structure -- multilayer grating -- singular integral formulation -- recursive algorithm ; article
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  • Description: The paper is devoted to an integral equation algorithm for studying the scattering of plane waves by multilayer diffraction gratings under oblique incidence. The scattering problem is described by a system of Helmholtz equations with piecewise constant coefficients in ℝ2 coupled by special transmission conditions at the interfaces between different layers. Boundary integral methods lead to a system of singular integral equations, containing at least two equations for each interface. To deal with an arbitrary number of material layers we present the extension of a recursive procedure developed by Maystre for normal incidence, which transforms the problem to a sequence of equations with 2×2 operator matrices on each interface. Necessary and sufficient conditions for the applicability of the algorithm are derived.