The finite element method as applied to the diffraction by an anisotropic grating.
The main goal of the method proposed in this paper is the numerical study of various kinds of anisotropic gratings deposited on isotropic substrates, without any constraint upon the diffractive pattern geometry or electromagnetic properties. To that end we propose a new FEM (Finite Element Method) formulation which rigorously deals with each infinite issue inherent to grating problems. As an example, 2D numerical experiments are presented in the cases of the diffraction of a plane wave by an anisotropic aragonite grating on silica substrate (for the two polarization cases and at normal or oblique incidence). We emphasize the interesting property that the diffracted field is non symmetric in a geometrically symmetric configuration.
Demésy
Guillaume
G
Institut Fresnel, UMR CNRS 6133, Faculté de Saint Jérôme, case 162, 13397 Marseille Cedex 20, France. uillaume.demesy@fresnel.fr
Zolla
Frédéric
F
Nicolet
André
A
Commandré
Mireille
M
Fossati
Caroline
C
D016880:Anisotropy; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D020342:Finite Element Analysis; D008027:Light; D008962:Models, Theoretical; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity