Abstract

A metal–graphene hybrid metasurface polarization converter is designed in this Letter. The unit cell of the hybrid metasurface is composed of a butterfly-shaped structure whose branches are connected by multi-layer graphene sheets. The proposed device can be reconfigured from linear-to-circular polarization to cross-polarization by changing the Fermi energy of graphene. The simulation results show that for three-layer graphene, the device acts as a linear-to-circular polarization converter when EF = 0 eV and switches to a cross-polarization converter when EF = 0.5 eV. Compared with single-layer graphene, the device with three-layer graphene can maintain the cross-polarization conversion performance under low Fermi energy. Furthermore, two equivalent circuits in the x and y directions are developed to understand the working mechanism of the device.

© 2019 Chinese Laser Press

Bi-functional switchable broadband terahertz polarization converter based on a hybrid graphene-metal metasurface

Jiarui Zhang, Kun Zhang, Aili Cao, Yan Liu, and Weijin Kong
Opt. Express 28(18) 26102-26110 (2020)

Broadband and switchable terahertz polarization converter based on graphene metasurfaces

Rui Zhang, Bing You, Shengchuan Wang, Kui Han, Xiaopeng Shen, and Weihua Wang
Opt. Express 29(16) 24804-24815 (2021)

Bandwidth broadening of a graphene-based circular polarization converter by phase compensation

Xi Gao, Wanli Yang, Weiping Cao, Ming Chen, Yannan Jiang, Xinhua Yu, and Haiou Li
Opt. Express 25(20) 23945-23954 (2017)

Controllable linear asymmetric transmission and perfect polarization conversion in a terahertz hybrid metal-graphene metasurface

Jianxing Zhao, Jianlin Song, Tianyu Xu, Tingxiang Yang, and Jianhong Zhou
Opt. Express 27(7) 9773-9781 (2019)

Tunable reflective dual-band line-to-circular polarization convertor with opposite handedness based on graphene metasurfaces

Yu Fu, Yueke Wang, Guofeng Yang, Qi Qiao, and Yongqi Liu
Opt. Express 29(9) 13373-13387 (2021)