Linear polarization conversion of transmitted terahertz wave with double-layer meta-grating surfaces

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英文篇名：Linear polarization conversion of transmitted terahertz wave with double-layer meta-grating surfaces 作者：孙翰 ; 张雅鑫 ; 王开龙 ; 赵运成 ; 寇伟 ; 梁士雄 ; 韩家广 ; 杨梓强 英文作者：Han Sun;Yaxin Zhang;Kailong Wang;Yuncheng Zhao;Wei Kou;Shixiong Liang;Jiaguang Han;Ziqiang Yang;Terahertz Science Cooperative Innovation Center,University of Electronic Science and Technology of China;National Key Laboratory of Application Specific Integrated Circuit,Hebei Semiconductor Research Institute;Center for Terahertz Waves,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Key Laboratory of Optoelectronic Information Technology (Ministry of Education); 中文刊名：GXKB 英文刊名：中国光学快报(英文版) 机构：Terahertz Science Cooperative Innovation Center,University of Electronic Science and Technology of China;National Key Laboratory of Application Specific Integrated Circuit,Hebei Semiconductor Research Institute;Center for Terahertz Waves,College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Key Laboratory of Optoelectronic Information Technology (Ministry of Education); 出版日期：2018-08-10 出版单位：Chinese Optics Letters 年：2018 期：v.16 基金：supported by the National Natural Science Foundation of China(Nos.61531010,61270011,91438118,and 61501094);; the National Key Basic Research Program of China(No.2014CB339806) 语种：英文; 页：GXKB201808012 页数：4 CN：08 ISSN：31-1890/O4 分类号：58-61

摘要

In this Letter, we demonstrate a linear polarization conversion of transmitted terahertz wave with double-layer meta-grating surfaces, which integrated the frequency selectivity of a split ring resonator metasurface and the polarization selectivity of a metallic grating surface. Since the double-layer can reduce the loss, and the Fabry–Perot like resonant effect between the two layers can improve the conversion efficiency, this converter can rotate the incident y-polarized terahertz wave into an x-polarized transmitted wave with relatively low loss and high efficiency. Experimental results show that an average conversion efficiency exceeding 75% from 0.25 to 0.65 THz with the highest efficiency of 90% at 0.43 THz with only-2 dB loss has been achieved.
        In this Letter, we demonstrate a linear polarization conversion of transmitted terahertz wave with double-layer meta-grating surfaces, which integrated the frequency selectivity of a split ring resonator metasurface and the polarization selectivity of a metallic grating surface. Since the double-layer can reduce the loss, and the Fabry–Perot like resonant effect between the two layers can improve the conversion efficiency, this converter can rotate the incident y-polarized terahertz wave into an x-polarized transmitted wave with relatively low loss and high efficiency. Experimental results show that an average conversion efficiency exceeding 75% from 0.25 to 0.65 THz with the highest efficiency of 90% at 0.43 THz with only-2 dB loss has been achieved.

引文

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