Modified FDTD method for triangular lattice photonic crystals (光エレクトロニクス)

概要

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A modified and easy finite-difference time-domain (FDTD) method based on a regular Cartesian Yee's lattice is developed for calculating the dispersion diagram of triangular lattice photonic crystals. Our method uses the standard central-difference equations, which is very easy to implement in any computing environment. The Bloch periodic boundary conditions are applied on the sides of the small rectangular unit-cell by translating the sides of the small rectangle to match with the directions of periodicity in the triangular lattice. Complete and accurate bandgap information is obtained by using this FDTD approach. Numerical results for 2-D TE/TM modes in triangular lattice photonic crystal are in good agreement with results from 2-D plane wave expansion method. To ease the practical application of this method, clear explanations on the computer implementation are provided.
社団法人電子情報通信学会の論文
2008-12-12