Title: The novel graphene metasurfaces based on split-ring resonators for tunable polarization switching and beam steering at terahertz frequencies 

Author(s): Chen, DB (Chen, Dingbo); Yang, JB (Yang, Junbo); Huang, J (Huang, Jie); Bai, W (Bai, Wei); Zhang, JJ (Zhang, Jingjing); Zhang, ZJ (Zhang, Zhaojian); Xu, SY (Xu, Siyu); Xie, WL (Xie, Wanlin) 

Source: CARBON  Volume: 154  Pages: 350-356  DOI: 10.1016/j.carbon.2019.08.020  Published: DEC 2019   

Abstract: Graphene-based metasurfaces have emerged as promising photoelectric devices for dynamically controlling the polarization and wavefront of electromagnetic waves. A series of novel graphene-based metasurfaces consisting of split-ring resonators are proposed and researched. A dynamically tunable broadband converter of polarization states composed of periodically patterned graphene split-rings for linearly polarized waves is achieved in terahertz regime. By designing different geometrical parameters, the resonators indicate 2 pi of smooth phase modulation in a broadband frequency regime. Based on the phase profile design, a polarization beam splitter and a transmission-type focusing metasurface in a broadband frequency regime are both demonstrated successfully. Furthermore, the efficiency of these metasurfaces is dynamically tunable by modulating the gate voltage to change the Fermi energy (E-f) of graphene. This work may offer a potentially effective method to instruct the design of tunable polarization converter and wavefront-controlling devices. (C) 2019 Elsevier Ltd. All rights reserved. 

ISSN: 0008-6223 

eISSN: 1873-3891