Boundary-element analysis of plane-wave diffraction from groove-type dielectric and metallic gratings
Abstract
A numerical approach based on the boundary-element method (BEM) is described for the analysis of plane-wave diffraction from groove-type gratings. First, the diffraction problem is exactly analyzed as a two-medium boundary-value problem. Further, for metallic gratings, a simple method in which an approximate boundary condition using the surface impedance is combined with the BEM is proposed. Both cases of the TE- and TM-wave incidences are systematically formulated. Numerical examples are presented for dielectric holographic gratings and metallic Fourier gratings, and the validity of the BEM and the effectiveness of the surface-impedance approximation are confirmed.
- Publication:
-
Journal of the Optical Society of America A
- Pub Date:
- August 1990
- DOI:
- 10.1364/JOSAA.7.001494
- Bibcode:
- 1990JOSAA...7.1494N
- Keywords:
-
- Boundary Element Method;
- Gratings (Spectra);
- Plane Waves;
- Wave Diffraction;
- Dielectrics;
- Grooves;
- Half Spaces;
- Metals;
- Physics (General)