具有缺陷态的二维光子晶体通讯波长滤波器的结构优化设计

Structural design of communication filters using two-dimensional photonic crystals with defect modes

采用平面波展开法分别模拟设计了理想和带有点缺陷与线缺陷的二维光子晶体能带结构;进一步构建具有点缺陷和线缺陷联合结构滤波器,通过改变介质折射率、介质柱半径和背景材料折射率,使点缺陷的滤波中心波长处于光子晶体禁带中的1.31和1.55μm两个主要通迅波长.同时,采用时域有限差分算法模拟滤波器的传播和滤波频谱特性,结果显示,该结构滤波器的滤波频谱中心波长刚好分别位于1.31和1.55μm,透射峰尖锐,显现出优良的滤波特性.

The band structures of 2D photonic crystals without and with point and line defects were simulated using plane wave expansion method.By calculating different index and radius of lattices,the 2D photonic crystal structures combining a point and a line defects were successfully designed to have modes in 1.31 and 1.55μm.The optical transmission and leaching characteristics of the designed structures were simulated by finite-difference time-domain(FDTD) method.The results show that the leaching spectra are sha...