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

作　　者：Han Sun Yaxin Zhang Kailong Wang Yuncheng Zhao Wei Kou Shixiong Liang Siaguang Han Ziqiang Yang 孙翰;张雅鑫;王开龙;赵运成;寇伟;梁士雄;韩家广;杨梓强(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))

机构地区：[1]Terahertz Science Cooperative Innovation Center, University of Electronic Science and Technology of China, Chengdu 610054, China [2]National Key Laboratory of Application Specific Integrated Circuit, Hebei Semiconductor Research Institute, Shijiazhuang 050051, China [3]Center for Terahertz Waves, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Key Laboratory of Optoelectronic Information Technology （Ministry of Education）, Tianjin 300072, China

出　　处：《Chinese Optics Letters》2018年第8期54-57,共4页中国光学快报（英文版）

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)

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 onlv -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 onlv -2 dB loss has been achieved.

关 键 词：Linear polarization conversion of transmitted terahertz wave with double-layer meta-grating surfaces THZ 

分 类 号：O441[理学—电磁学] TN253[理学—物理]