GU Wen-hao,CHANG Sheng-jiang,FAN Fei.A novel terahertz device with multi-function of polarization and switch based on phase transition of VO2[J].Optoelectronics Letters,2016,12(6):409-412 A novel terahertz device with multi-function of polarization and switch based on phase transition of VO2 Author Name Affiliation GU Wen-hao  Institute of Modern Optics, Nankai University, Tianjin 300071, China  CHANG Sheng-jiang  Institute of Modern Optics, Nankai University, Tianjin 300071, China  FAN Fei  Institute of Modern Optics, Nankai University, Tianjin 300071, China  Abstract:       A terahertz (THz) polarizer and switch structure is proposed based on the phase transition of vanadium dioxide (VO2). When VO2 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 VO2 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. Hits: 3798 Download times: 0 View Full Text    Download reader