The finite difference time domain calculation of one-dimensional photonic crystals composed of repetitive metallic and dielectric layers

摘要

The frequency dependence on the reflectance of a one-dimensional (ID) photonic crystal composed of repetitive metallic and dielectric layers was simulated by the finite difference in the time domain (FDTD) method, and with results compared to the conventional transfer matrix (TM) method. The simulation from the FDTD method with an impedance-matched boundary of finite dimensions yields results similar to the calculation from the TM method with unbounded planes. The FDTD method is prominent in dealing with films of finite area including defects at some locations. The reflectivity increases and the rejection bandwidth decreases as the number of layers increases.