论文部分内容阅读
基于二维光子晶体,提出一种多频段太赫兹(THz)波滤波器。在光子晶体中引入3条平行的横向波导,通过改变介质柱的半径或插入半径较小的介质柱在相邻波导之间构成耦合区域,使特定频率的THz波从中部波导耦合至上、下侧光子晶体波导并分别从端口2和1输出,其余的THz波经中部波导从端口3输出,最终达到多频段滤波的效果。利用时域有限差分法和平面波展开法对所提出的器件计算和仿真结果显示,频率为f=3.24、3.60和3.75THz的THz波分别从端口1、2和3输出中,传输效率分别达到95%、98%和99%,表明本文结构能很好实现多频段滤波效果。
Based on two-dimensional photonic crystal, a multi-band THz wave filter is proposed. Three parallel transverse waveguides are introduced in the photonic crystal. A coupling region is formed between the adjacent waveguides by changing the radius of the dielectric column or inserting the dielectric column with a smaller radius. The THz wave with a specific frequency is coupled from the central waveguide to the upper and lower sides Photonic crystal waveguides are respectively output from ports 2 and 1, and the remaining THz waves are output from port 3 through the middle waveguide, finally achieving the effect of multi-band filtering. The finite element method and the plane wave expansion method are used to calculate and simulate the proposed device. The results show that the THz waves with frequencies f = 3.24, 3.60 and 3.75 THz output from port 1, 2 and 3, respectively, and the transmission efficiency reaches 95 %, 98% and 99%, respectively, indicating that the structure of this paper can well achieve multi-band filtering effect.