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

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【作者】 张兰兰李萍宋霄薇

【Author】 Lan-Lan Zhang;Ping Li;Xiao-Wei Song;School of Medical Technology and Engineering, Henan University of Science and Technology;

【通讯作者】 张兰兰;

【机构】 School of Medical Technology and Engineering, Henan University of Science and Technology

【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.

【Abstract】 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.

【基金】 Project supported by the School Youth Fund of Henan University of Science and Technology (Grant No. 2014QN045)
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2021年12期
  • 【分类号】TQ127.11;O436.3
  • 【下载频次】24
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