摘要
A switchable terahertz(THz)polarization converter based on vanadium dioxide(VO_(2)) metamaterial is proposed.It is a 5-layer structure which containing metal split-ring-resonator(SRR),the first polyimide(PI)spacer,VO_(2) film,the second PI spacer,and metal grating.It is an array structure and the period in x and y directions is 100μm.The performance is simulated by using finite integration technology.The simulation results show that,when the VO_(2) is in insulating state,the device is a transmission polarization converter.The cross-linear polarization conversion can be realized in a broadband of0.70 THz,and the polarization conversion rate(PCR)is higher than 99%.Under thermal stimulus,the VO_(2) changes from insulating state to metallic state,and the device is a reflective polarization converter.The linear-to-circular polarization conversion can be successfully realized in a broadband of 0.50 THz,and the PCR is higher than 88%.
基金
supported in part by the National Natural Science Foundation of China(Grant Nos.62065005,61565004,11774288,and 62003107)
the Natural Science Foundation of Guangxi Zhuang Autonomous Region,China(Grant Nos.2018GXNSFAA050043,2020GXNSFDA238019,2019JJB110033,and 2017GXNSFBA198029)
the Innovation Project of Guangxi Graduate Education,China(Grant Nos.YCSW2021188,YCBZ2021071,and 2020YCXB04)
the Foundation from Guangxi Key Laboratory of Automatic Detecting Technology and Instrument(Grant No.YQ21101)
the Research and Development Project in Hunan Province,China(Grant No.2020SK2111)。
