| A reconfigurable terahertz polarization converter based on metal–graphene hybrid metasurface |
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| 引用本文： | 黄俊翔,傅涛,李海鸥,首照宇,高喜.A reconfigurable terahertz polarization converter based on metal–graphene hybrid metasurface[J].Chinese Optics Letters,2020(1):105-109. |
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| 作者姓名： | 黄俊翔 傅涛 李海鸥 首照宇 高喜 |
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| 作者单位： | School of Information and Communication;Key Laboratory of THz Technology |
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| 基金项目： | supported by the National Natural Science Foundation of China(Nos.61761010,61461016,61965009,and 61967005);part by the Natural Science Foundation of Guangxi(No.2018GXNSFAA281193);the Innovation Project of GUET Graduate Education(No.2018JYCX24). |
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| 摘 要： | A metal-graphene hybrid metasurface polarization converter is designed in this Letter.The unit cell of the hybrid metasurface is composed of a butterfly-shaped structure whose branches are connected by multi-layer graphene sheets.The proposed device can be reconfigured from linear-to-circular polarization to cross-polarization by changing the Fermi energy of graphene.The simulation results show that for three-layer graphene,the device acts as a linear-to-circular polarization converter when EF=0 eV and switches to a cross-polarization converter when EF=0.5 eV.Compared with single-layer graphene,the device with three-layer graphene can maintain the cross-polarization conversion performance under low Fermi energy.Furthermore,two equivalent circuits in the x and y directions are developed to understand the working mechanism of the device.
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| 关 键 词： | GRAPHENE metasurface POLARIZATION CONVERTER THZ |
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