Manipulation of sub-terahertz waves using digital coding metasurfaces based on liquid crystals

Author:

Zhang Guozhen1,Fang Qirui1,Li Ying,Yang JunORCID,Hu Minggang2,Li Jian2,Deng GuangshengORCID,Yin Zhiping,Lu Hongbo

Affiliation:

1. Hefei University of Technology

2. Xi An Modern Chemistry Research Institute

Abstract

This paper presents a novel sub-terahertz liquid crystal (LC) phase shifter based on digital coding metasurfaces. The proposed structure consists of metal gratings and resonant structures. They are both immersed in LC. The metal gratings function as reflective surfaces for electromagnetic waves and electrodes for controlling the LC layer. The proposed structure changes the state of the phase shifter by switching the voltage on every grating. It allows the deflection of LC molecules within a subregion of the metasurface structure. Four switchable coding states of the phase shifter are obtained experimentally. The phase of the reflected wave varies by 0°, 102°, 166°, and 233° at 120 GHz. Due to the presence of the transverse control electric field, modulation speed is approximately doubled compared to the free relaxation state. This work provides a novel idea for wavefront modulation of phase.

Funder

Natural Science Foundation of Anhui Province

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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