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

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
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Materials 2018, 11(7), 1054; https://doi.org/10.3390/ma11071054
Received: 10 April 2018 / Revised: 31 May 2018 / Accepted: 9 June 2018 / Published: 21 June 2018
(This article belongs to the Section Carbon Materials)
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Abstract

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. View Full-Text
Keywords: graphene; metasurface; spin angular momentum; orbital angular momentum; terahertz graphene; metasurface; spin angular momentum; orbital angular momentum; terahertz
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhang, C.; Deng, L.; Zhu, J.; Hong, W.; Wang, L.; Yang, W.; Li, S. Control of the Spin Angular Momentum and Orbital Angular Momentum of a Reflected Wave by Multifunctional Graphene Metasurfaces. Materials 2018, 11, 1054.

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