Terahertz polarization conversion and asymmetric transmission based on a liquid crystal integrated EIT metasurface

Author:

Xu Shi-Tong12ORCID,Fan Junxing2,Xue Zhanqiang2,Li Jiandi1,Wang Ying-Hua1,Pan Yue1ORCID,Cao Hong-Zhong1ORCID,Ma Ren-De1ORCID,Lu Dan2,Zhang Hui-Fang3,Cong Longqing2ORCID

Affiliation:

1. Qufu Normal University

2. Southern University of Science and Technology

3. University of Electronic Science and Technology of China

Abstract

We experimentally demonstrate a liquid crystal (LC)-integrated EIT metasurface for active THz polarization conversion and asymmetric transmission. By controlling the LC orientation under static magnetic field anchoring and an adjustable electric field, the device realizes the active control from the OFF state to the ON state, corresponding to the orthogonal polarization excitation modes of the EIT metasurface. Furthermore, based on the different polarization responses at forward and backward incidences, we achieve asymmetric transmission at the EIT peak and two nearby resonances, with its isolation actively manipulated by the external electric field. This study on dynamic polarization conversion and asymmetric transmission by a LC-integrated metasurface offers a promising route for active THz devices, applicable to THz communication, switching, and sensing systems.

Funder

National Natural Science Foundation of China

Guangdong Basic and Applied Basic Research Foundation

Shenzhen Science and Technology Program

Higher Educational Youth Innovation Science and Technology Program Shandong Province

Publisher

Optica Publishing Group

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