Stereo Metasurfaces for Efficient and Broadband Terahertz Polarization Conversion

Yuehong Xu; Quan Xu; Xueqian ZhangXi FengYongchang LuXixiang ZhangMing KangJiaguang HanWeili Zhang

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Stereo Metasurfaces for Efficient and Broadband Terahertz Polarization Conversion

机译：Stereo Metasurfaces for Efficient and Broadband Terahertz Polarization Conversion

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Efficient and flexible manipulation of terahertz (THz) polarization in a broadband manner using metasurfaces has attracted continuous attention in recent years. Previous studies have commonly applied multilayer metallic resonators or bonded dielectric structures as the basic units, which are affected by the spacer loss or bonding difficulty and stability. Here, a new design scheme is proposed based on an all-metal stereo U-shaped meta-atom working in a reflection configuration. The stereo metasurface functions as an efficient and broadband THz waveplate with tailorable birefringence simply controlled by the sunken depth. Such an intriguing property is experimentally verified by a reflection-type THz half-waveplate. The polarization conversion ratio is higher than 90, with 69 relative bandwidth and over 85° angle tolerance for incidence. Furthermore, an efficient and broadband meta-grating based on the Pancharatnam-Berry phase method is also experimentally demonstrated. The proposed strategy enriches the design degrees of freedom of polarization-related metasurfaces and may find broad applications in realizing various functional devices.

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《Advanced functional materials》 |2022年第44期|2207269.1-2207269.8|共8页
作者
Yuehong Xu; Quan Xu; Xueqian ZhangXi FengYongchang LuXixiang ZhangMing KangJiaguang HanWeili Zhang;
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作者单位

Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronic Information Technology (Ministry of Education of China) Tianjin University Tianjin 300072, China;

Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronic Information Technology (Ministry of Education of China) Tianjin University Tianjin 300072, China,Physical Science and Engineeri;

College of Physics and Materials Science Tianjin Normal University Tianjin 300387, ChinaCenter for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronic Information Technology (Ministry of Education of China) Tianjin University Tianjin 300072, China,Guangxi Key Laboratory of OptoSchool of Electrical and Computer Engineering Oklahoma State University Stillwater, Oklahoma 74078, USA;

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正文语种英语
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all-metal stereo metasurfaces; coupled-mode theory; polarization conversion; Pancharatnam–Berry phase; terahertz;

Stereo Metasurfaces for Efficient and Broadband Terahertz Polarization Conversion

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