Reflective terahertz tunable polarization controller  

作　　者：牛超 常胜江 

机构地区：[1]Institute of Modern Optics,Nankai University

出　　处：《Optoelectronics Letters》2012年第4期264-268,共5页光电子快报（英文版）

基　　金：supported by the National Key Basic Research Program of China(No.2007CB310403)

摘　　要：This paper proposes an optical device which can continuously change the polarization state of terahertz （THz） waves. The device consists of metal gate, anU-refleetlon coatings, liquid crystal and mirror. By changing the refractive index of liquid crystal in the interface between the metal gate and the mirror, the phase difference between two beams with orthogonal polarization is varied and a continuous phase sliift is achieved. The phase shift of the device is calculated by using the finite difference time domain （FDTD） method, and the transmittance and reflectance are calculated by using the rigorous coupled wave analysis （RCWA） method. The results reveal that the structure can realize continuously tunable phase shift for THz wave at 1 THz.

关 键 词：Finite difference time domain method Liquid crystals Mirrors Phase shift Phase shifters POLARIZATION Refractive index 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]