摘要
提出了一种基于二维光子晶体的低损耗、宽频带太赫兹滤波器。利用线缺陷直波导实现对辐射波的传输,在直波导中间设置点缺陷微腔,通过改变腔内介质柱半径和分布,实现太赫兹耦合,达到滤波效果。应用平面波法(PWM)和时域有限差分法(FDTD)对滤波器滤波特性进行仿真分析,最后通过引入两组点缺陷结构,实现谐振腔的级联。
A low-loss broadband terahertz filter based on two-dimensional photonic crystal is presented. The structure uses a linear defect straight waveguide to realize the transmission of the radiation wave. Terahertz wave can be well coupled by changing the point defect micro cavity of the dielectric cylinder radius and distri- bution which arranges in the middle of the straight waveguid, so as to achieve the filter effect. Simulation anal- ysis about the characteristics of filter are carried out by using the plane wave expansion method （PWM） and the finite difference time-domain method （FDTD）. Finally, two pairs of point defects have been introduced to realize the cascaded of two resonant cavities.
出处
《光通信技术》
北大核心
2017年第3期23-26,共4页
Optical Communication Technology
基金
重庆邮电大学新方向培育计划项目(A2014-116)资助
关键词
太赫兹
光子晶体
谐振腔
滤波器
terahertz（THz）
photonic crystal
resonant cavity
filter
