A novel terahertz device with multi-function of polarization and switch based on phase transition of VO_2  

作　　者：谷文浩 常胜江 范飞 

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

出　　处：《Optoelectronics Letters》2016年第6期409-412,共4页光电子快报（英文版）

基　　金：supported by the National Basic Research Program of China(No.2014CB339800);the National Natural Science Foundation of China(Nos.61171027 and 61505088);the Natural Science Foundation of Tianjin of China(No.15JCQNJC02100);the Project of Science and Technology Program of Tianjin of China(No.13RCGFGX01127)

摘　　要：A terahertz(THz) polarizer and switch structure is proposed based on the phase transition of vanadium dioxide(VO_2). When VO_2 is in the insulation phase, the resonance frequencies of the proposed structure are 1.49 THz and 1.22 THz for the x- and y-polarization, respectively. It can perform as a THz polarizer with extinction ratios of 52.5 dB and 17 dB for the y- and x-polarization, respectively; When VO_2 transforms into metallic phase, the resonance frequency for x-polarization wave shifts from 1.49 THz to 1.22 THz, while that remains still for the y-polarization component. It means that the structure can work as a polarization-dependent THz switch with a high extinction ratio of 32 dB.

关 键 词：switch terahertz extinction metallic vanadium insulation pumping resonator dioxide tetragonal 

分 类 号：O441[理学—电磁学]