部分无序二维光子晶体透射特性研究

The optical transmission characteristics in two dimension photonic crystal with part disorder

用时域有限差分法研究了光在部分无序二维光子晶体中的透射特性。结果表明:介质柱的位置和大小无序都对光子晶体的高频透射特性都有影响而对低频几乎无影响,随着无序度增大,禁带呈现拓宽的趋势。仅介质柱的位置无序变化时,每个带隙低频端边缘比高频端边缘对无序度变化更敏感。仅介质柱的大小无序变化时,每个带隙间的通带频率越高对无序度变化越敏感。介质柱的大小无序和位置无序度相同时,在高频段后者比前者作用更显著。

The optical transmission characteristics in two dimension photonic crystal with part disorder is investigated by the finite-difference-time-domain method.The result shows the disorder of both location and size of large-refractive-index cylinder plays an important role in determining the optical transmission characteristic in the high frequency,but the optical transmission characteristic in the low frequency has hardly something with the disorder and the photo gas band is broadened with increase of disorder.The low frequency of each gas band is more sensitive to the disorder than the high frequency of each gas band if the location of large-refractive-index cylinder.The high the frequency is,the more sensitive to the disorder of size of large-refractive-index cylinder the optical transmission characteristics is.If the disorder of location and size is same,the high frequency is more sensitive than the low frequency to the disorder.