EFFICIENT SIMULATIONS OF PERIODIC STRUCTURES WITH OBLIQUE INCIDENCE USING DIRECT SPECTRAL FDTD METHOD

Abstract

A simple and e-cient joint algorithm of flnite difierence time domain (FDTD) and periodic boundary condition (PBC), called as the direct spectral FDTD method, has been investigated to study three-dimensional (3D) periodic structures with oblique incidence, where both the azimuth angleand the elevation angle µ are varying. The number of sampling points for the horizontal wave number can be determined by using an adaptive approach. As numerical results, the transmission and re∞ection coe-cients from split-ring resonators (SRRs) and a dielectric grating slab are computed to validate the accuracy and e-ciency of the direct spectral FDTD method. The computed results are in good agreement to the published ones obtained by other methods.