Main > Chinese Optics Letters >  Volume 16 >  Issue 8 >  Page 081601 > Article
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Accepted: Jun. 13, 2018

Posted: Jan. 17, 2019

Published Online: Aug. 2, 2018

The Author Email: Yaxin Zhang (zhangyaxin@uestc.edu.cn), Shixiong Liang (wialliam@163.com)

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Han Sun, Yaxin Zhang, Kailong Wang, Yuncheng Zhao, Wei Kou, Shixiong Liang, Jiaguang Han, Ziqiang Yang. Linear polarization conversion of transmitted terahertz wave with double-layer meta-grating surfaces[J]. Chinese Optics Letters, 2018, 16(8): 081601

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## Abstract

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.