光学仪器, 2017, 39 (5): 70, 网络出版: 2017-12-01
基于半导体的可调谐太赫兹滤波器研究
Study of the tunable THz filter based on semiconductor
半导体材料 太赫兹滤波器 温控可调谐 微结构 有限时域差分法 semiconductor material terahertz filter thermally tunable microstructure finite difference time domain method
摘要
太赫兹滤波器在通信、传感、成像等领域有着广泛的应用。提出了一个基于半导体材料砷化镓的周期性微结构可调谐太赫兹滤波器,并对半导体材料的电介质特性以及微结构的太赫兹滤波特性进行模拟研究。提出了基于光栅结构的太赫兹滤波器,用CST软件时域有限差分法(FDTD)进行模拟仿真,0.1~5.0 THz频段的太赫兹波垂直入射光栅表面,在225~325 K范围内可获得工作频率为0.35~1.51 THz,1.16 THz的滤波带宽,同时保持透过率在85%以上,这对太赫兹滤波器的滤波带宽和透过率的提升具有重大意义。
Abstract
Terahertz filter can be used for various application such as communication,sensing and imaging.This paper proposed a kind of tunable THz filter with periodic microstructure based on semiconductor material GaAs.Besides,the dielectric properties of the semiconductor and the transmission characteristics of the THz filter have been studied.The proposed THz filter based on grating structure,and the transmission characteristics of the filter has been investigated with the aid of the CST software through finite difference time domain method.The incident THz wave is perpendicular to the surface of grating from 0.1 THz to 5.0 THz.It turned out that the bandwidth can reach 1.16 THz from 0.35 THz to 1.51 THz with the temperature varied from 225 K to 325 K,while the transmission kept above 85%.It makes a great contribution to the improvement of the transmittance and the bandwidth of the Thz filter.
黄甜, 刘琪, 王琦, 张大伟. 基于半导体的可调谐太赫兹滤波器研究[J]. 光学仪器, 2017, 39(5): 70. HUANG Tian, LIU Qi, WANG Qi, ZHANG Dawei. Study of the tunable THz filter based on semiconductor[J]. Optical Instruments, 2017, 39(5): 70.