Achieving Photonic Spin Hall Effect, Spin-Selective Absorption, and Beam Deflection with a Vanadium Dioxide Metasurface

Author:

Zhao Pengfei1,Ding Xinyi1,Li Chuang1,Tang Shiwei12ORCID

Affiliation:

1. School of Physical Science and Technology, Ningbo University, Ningbo 315211, China

2. State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China

Abstract

Metasurface-based research with phase-change materials has been a prominent and rapidly developing research field that has drawn considerable attention in recent years. In this paper, we proposed a kind of tunable metasurface based on the simplest metal–insulator–metal structure, which can be realized by the mutual transformation of insulating and metallic states of vanadium dioxide (VO2) and can realize the functional switching of photonic spin Hall effect (PSHE), absorption and beam deflection at the same terahertz frequency. When VO2 is insulating, combined with the geometric phase, the metasurface can realize PSHE. A normal incident linear polarized wave will be split into two spin-polarized reflection beams traveling in two off-normal directions. When VO2 is in the metal state, the designed metasurface can be used as a wave absorber and a deflector, which will completely absorb LCP waves, while the reflected amplitude of RCP waves is 0.828 and deflects. Our design only consists of one layer of artificial structure with two materials and is easy to realize in the experiment compared with the metasurface of a multi-layer structure, which can provide new ideas for the research of tunable multifunctional metasurface.

Funder

Natural Science Foundation of Zhejiang Province

Fundamental Research Funds of Shaanxi Key Laboratory of Artificially Structured Functional Materials and Devices

Natural Science Foundation of Ningbo

Publisher

MDPI AG

Subject

General Materials Science

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