Abstract

Electromagnetic fields in and near metallic corrugated surfaces can be numerically modeled by a variety of methods with different degrees of completeness and complexity. The finite difference-time domain (FDTD) technique is a good modeling approach to this problem because the full vector Maxwell’s equations are solved directly on a mesh that coincides with the specified problem geometry. In order to consider more closely the situation where an optically thin layer of a metal such as gold has been applied to the surface of the grating, we have added several enhancements^1,2 to the standard FDTD approach^3,4.

© 1995 Optical Society of America