Tunable wide-angle multi-band mid-infrared linear-to-linear polarization converter based on a graphene metasurface  

作　　者：Lan-Lan Zhang Ping Li Xiao-Wei Song 张兰兰;李萍;宋霄薇(School of Medical Technology and Engineering,Henan University of Science and Technology,Luoyang 471000,China)

机构地区：[1]School of Medical Technology and Engineering,Henan University of Science and Technology,Luoyang 471000,China

出　　处：《Chinese Physics B》2021年第12期607-612,共6页中国物理B（英文版）

基　　金：Project supported by the School Youth Fund of Henan University of Science and Technology(Grant No.2014QN045)。

摘　　要：We present a high-efficiency tunable wide-angle multi-band reflective linear-to-linear(LTL)polarization converter,which is composed of an array of two L-shaped graphene patches with different sizes.In the mid-infrared region,the proposed converter can transform x-polarized wave into y-polarized wave at four resonant frequencies.The polarization conversion ratios of the four bands reach 94.4%,92.7%,99.3%,and 93.1%,respectively.By carefully choosing the geometric parameter,triple-band LTL polarization conversion can also be realized.The three polarization conversion ratios reach 91.50%,99.20%,and 97.22%,respectively.The influence of incident angle on the performances of the LTL polarization converter is investigated,and it is found that our polarization converter shows the angle insensitivity.Also,the dynamically tunable properties of the proposed polarization converter are numerically studied by changing Fermi energy.All the simulation results are conducted by finite element method.

关 键 词：metasurface GRAPHENE polarization converter MULTI-BAND 

分 类 号：TQ127.11[化学工程—无机化工] O436.3[机械工程—光学工程]