title: Time-domain analysis of periodic anisotropic media at oblique incidence: an efficient FDTD implementation.
abstract: We describe an efficient implementation of the finite-difference time-domain (FDTD) method as applied to lightwave propagation through periodic media with arbitrary anisotropy (birefringence). A permittivity tensor with non-diagonal elements is successfully integrated here with periodic boundary conditions, bounded computation space, and the split-field update technique. This enables modeling of periodic structures using only one period even with obliquely incident light in combination with both monochromatic (sinusoidal) and wideband (time-domain pulse) sources. Comparisons with results from other techniques in four validation cases are presented and excellent agreement is obtained. Our implementation is freely available on the Web.
authors.forename: Chulwoo
authors.initials: C
authors.lastname: Oh
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Escuti