Dual channel transformation of scalar and vector terahertz beams along the optical path based on dielectric metasurface

Author:

Luo Li1,Liu Xiao1,Duan Shouxin2,Li Hui3ORCID,Xu Hang3,Peng Sui4,Liu Bo4,Wang Yuting1,Wang Lingzhi1,Zou Yuxin1,Li Jie1ORCID,Shen Yun2ORCID,Yao Jianquan3

Affiliation:

1. Information Materials and Device Applications Key Laboratory of Sichuan Provincial Universities , Chengdu University of Information Technology , Chengdu 610225 , China

2. Department of Physics, School of Physics and Materials Science , Nanchang University , Nanchang 330031 , China

3. Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering , Tianjin University , Tianjin 300072 , China

4. Chengdu Advanced Metal Materials Industry Technology Research Institute Limited Company , Chengdu 610300 , China

Abstract

Abstract The research on terahertz wave manipulation based on metasurfaces has gradually deepened, and the number of functions or electromagnetic control dimensions in a single device is constantly increasing. For the spatial dimension of terahertz field regulation, its design degrees of freedom have been expanded from a single transverse plane to the propagation path. In this paper, we propose a novel circularly polarization multiplexed metasurface for dual channel terahertz wave transmission control. Based on the spatial integration of two heterogeneous meta-atoms, which are spin-decoupled and isotropic, respectively, there are four phase channels that can be used at the same time, thus achieving different switching between vector and scalar beams in different circularly polarization channels along the optical path. For linearly polarized wave incidence, the device exhibits conversion between different vector beams longitudinally. To control more electric field components, we combine focused wavefront design with vector or scalar fields and utilize the focusing induced spin–orbit coupling effect, then complex amplitude switching of longitudinal electric field components is obtained. This article extends the manipulation of terahertz waves along the propagation trajectory based on metasurface from single to dual channel for the first time, providing a reference for the design of multifunctional meta-device in terahertz band.

Funder

Key Research and Development Project of Sichuan Province: Research on Development and Application Tech-nology of VO2 Nano powder/Slurry with Intelli-gent Temperature Control

Scientific Research Foundation of Chengdu University of Information Technology

the National Intelligent Social Governance Experimental Base Open Project of Cheng-du University of Information Technology

Publisher

Walter de Gruyter GmbH

Subject

Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology

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