The distribution of guided modes and transmission characteristics in planar optical waveguides is analyzed using two methods:geometrical optics and wave optics.The mode field distribution within the same waveguide is accurately calculated by exciting it with light waves at different wavelengths,employing the two-dimensional time-domain finite difference method.The results indicate that light wave energy continuously leaks out and diminishes over time;additionally,longer wavelengths result in faster energy leakage,even when the total reflection condition is satisfied in the fundamental mode.This phenomenon reflects the high-pass filter characteristics of planar optical waveguides.
关键词
平板光波导/高通滤波/时域有限差分法/模场
Key words
planar optical waveguide/high-pass filtering/finite-difference time-domain/mode field
维普
万方数据