Terahertz faraday rotation of magneto-optical films enhanced by helical metasurface

被引：19

作者：

Li, Teng-Fei ^{[1
]}

Li, Yi-Lei ^{[2
]}

Zhang, Zi-Yang ^{[3
]}

Yang, Qing-Hui ^{[2
]}

Fan, Fei ^{[1
]}

Wen, Qi-Ye ^{[2
]}

Chang, Sheng-Jiang ^{[3
]}

机构：

[1] Nankai Univ, Inst Modern Opt, Tianjin Key Lab Microscale Opt Informat Sci & Tec, Tianjin 300350, Peoples R China

[2] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Sichuan, Peoples R China

[3] Tianjin Key Lab Optoelect Sensor & Sensing Networ, Tianjin 300350, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2020年 / 116卷 / 25期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1063/5.0009704

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The Faraday rotation effect of both the La: yttrium iron garnet (YIG) film and the YIG metasurface were experimentally and numerically investigated in the terahertz (THz) region. A THz magneto-optic polarization measurement system was used to observe the transmission, resonance, and magneto-optical effect of the La:YIG film and YIG metasurface. The THz artificial chirality and resonance localization of the helical metasurface generate the superchiral THz field, which enhances the THz magneto-optical effect of the YIG film. The results show that the Faraday effect of the YIG metasurface is about three times that of the pure YIG film, whose differential rotation angle increases from 8 degrees to over 24 degrees. This work achieves more sensitively active polarization control of THz waves, which is of great significance for THz polarization conversion, sensing, and non-reciprocal transmission.

引用

页数：4

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