Vol. 80

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2018-02-19

Electromagnetic Scattering from One Dimensional Random Rough Surfaces of Dielectric Layered Media with Waveguide Modes Using Second Order Small Perturbation Method

By Mohammadreza Sanamzadeh, Leung Tsang, Joel Johnson, Robert J. Burkholder, and Shurun Tan
Progress In Electromagnetics Research B, Vol. 80, 1-17, 2018
doi:10.2528/PIERB17101005

Abstract

An alternative formulation of the Small Perturbation Method (SPM) in solving electromagnetic scattering from multi-layer random rough surfaces to resolve singularities in spectral integrals is presented. Non-monotonic permittivity changes will allow a multi-layer structure with flat interfaces to support guided modes. The presence of these guided modes translates to poles in the zeroth order Green's function of the media for the surface fields. The poles appear in the first and second order perturbation solutions based on a iterative procedure. Thus, evaluating the spectral integrals to obtain the spatial fields becomes problematic. The Sommerfeld integration path instead of real line integrals is introduced by analytic continuation of the integrand into complex spectral space. It is verified that this alternative spectral integration method is valid for both monotonic and non-monotonic cases.

Citation


Mohammadreza Sanamzadeh, Leung Tsang, Joel Johnson, Robert J. Burkholder, and Shurun Tan, "Electromagnetic Scattering from One Dimensional Random Rough Surfaces of Dielectric Layered Media with Waveguide Modes Using Second Order Small Perturbation Method," Progress In Electromagnetics Research B, Vol. 80, 1-17, 2018.
doi:10.2528/PIERB17101005
http://jpier.org/PIERB/pier.php?paper=17101005

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