Control of the Spin Angular Momentum and Orbital Angular Momentum of a Reflected Wave by Multifunctional Graphene Metasurfaces

Chen Zhang; Li Deng; Jianfeng Zhu; Weijun Hong; Ling Wang; Wenjie Yang; Shufang Li

doi:10.3390/ma11071054

Materials (Jun 2018)

Control of the Spin Angular Momentum and Orbital Angular Momentum of a Reflected Wave by Multifunctional Graphene Metasurfaces

Chen Zhang,
Li Deng,
Jianfeng Zhu,
Weijun Hong,
Ling Wang,
Wenjie Yang,
Shufang Li

Affiliations

Chen Zhang: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing Laboratory of Advanced Information Network, Beijing University of Posts and Telecommunications, 10 Xitucheng Road, Beijing 100876, China
Li Deng: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing Laboratory of Advanced Information Network, Beijing University of Posts and Telecommunications, 10 Xitucheng Road, Beijing 100876, China
Jianfeng Zhu: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing Laboratory of Advanced Information Network, Beijing University of Posts and Telecommunications, 10 Xitucheng Road, Beijing 100876, China
Weijun Hong: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing Laboratory of Advanced Information Network, Beijing University of Posts and Telecommunications, 10 Xitucheng Road, Beijing 100876, China
Ling Wang: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing Laboratory of Advanced Information Network, Beijing University of Posts and Telecommunications, 10 Xitucheng Road, Beijing 100876, China
Wenjie Yang: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing Laboratory of Advanced Information Network, Beijing University of Posts and Telecommunications, 10 Xitucheng Road, Beijing 100876, China
Shufang Li: Beijing Key Laboratory of Network System Architecture and Convergence, Beijing Laboratory of Advanced Information Network, Beijing University of Posts and Telecommunications, 10 Xitucheng Road, Beijing 100876, China

DOI: https://doi.org/10.3390/ma11071054
Journal volume & issue: Vol. 11, no. 7
p. 1054

Abstract

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Three kinds of multifunctional graphene metasurfaces based on Pancharatnam–Berry (PB) phase cells are proposed and numerically demonstrated to control a reflected wave’s spin angular momentum (SAM) and orbital angular momentum (OAM) in the terahertz (THz) regime. Each proposed metasurface structure is composed of an array of graphene strips with different deviation angles and a back-grounded quartz substrate. In order to further help readers have a deeper insight into the graphene-based metasurfaces, a detailed design strategy is also provided. With the aid of the designed graphene elements, the proposed metasurfaces can achieve the full 360° range of phase coverage and provide manipulation of SAM and OAM of a circularly polarized (CP) wave at will. More importantly, simultaneous control of these two momentums can also be realized, and in order to demonstrate this function, a THz spin-controlled OAM beam generator with diverse topological charges is created, which can provide one more degree of freedom to improve the channel capability without increasing the bandwidth compared to a linearly polarized (LP) OAM beam. Numerical results verify the proposed graphene metasurfaces, which pave the way for generating spin OAM vortex waves for THz communication systems.

Published in Materials

ISSN: 1996-1944 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering; Technology: Engineering (General). Civil engineering (General); Science: Natural history (General): Microscopy; Science: Physics: Descriptive and experimental mechanics
Website: http://www.mdpi.com/journal/materials/

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