Analysis of infinitely thin dielectric gratings with surface relief

The spectral Galerkin procedure is often used for analyzing metallic gratin gs which are assumed to be zero-thickness plane gratings, In: this report, thin surface relief dielectric gratings with complex permittivity are discu ssed and analyzed by using the numerical approach for metallic plane gratin gs with surface impedance. From numerical results for dielectric gratings b y the conventional method and metallic plane gratings by the spectral Galer kin procedure, the relations between dielectric and plane gratings are inve stigated. In addition, some numerical results for infinitely thin gratings with various surface reliefs are given and the differences between surface profiles are investigated. (C) 1999 Scripta Technica.