Numerical method for computing defect modes in two-dimensional photonic crystals with dielectric or metallic inclusions

Publisher Website
Google Scholar
Abstract
A numerical method based on the finite-difference time-domain (FDTD) scheme for computing defect modes in two-dimensional photonic crystals (with dielectric or metallic inclusions) is presented. Compared to the FDTD transmission spectra method, the present method reduces the computation domain significantly. By means of it one can find as many defect modes as possible, including those that are inactive to the incident plane wave in the FDTD transmission spectra method. The calculated eigenfrequencies and field patterns for a defect in a square array of dielectric rods are consistent with those obtained by the plane wave expansion method. Modes for a defect in a square array of copper rods are also studied, and the calculated eigenfrequencies are in a very good agreement with experimental results.