Abstract
We propose a tunable broadband reflective cross polarization converter (CPC) composed of a graphene sheet with a T-shaped carved-hollow array. In the mid-infrared region, cross polarization conversion with 5.17 THz bandwidth is achieved due to the superimposition of the two reflection components with a phase difference of nearly 180°. The polarization conversion ratio is larger than 80% in this broadband range, and the fractional bandwidth is 40%. The physical mechanism of CPC is attributed to the excitation of symmetric and antisymmetric graphene surface plasmons. The CPC broadband can always be retained when the incident angle increases from 0° to 20°, and the polarization angle increases from 40° to 50°. Also, the tunable responses of the reflective polarizer with Fermi energy and electron scattering time are discussed. Our design can be widely applied to adjustable broadband polarization conversion.
© 2021 Optical Society of America
Full Article | PDF ArticleMore Like This
Qi Qiao, Yueke Wang, Guofeng Yang, Yu Fu, and Yongqi Liu
Opt. Mater. Express 11(9) 2952-2965 (2021)
Lanlan Zhang, Ping Li, and Xiaowei Song
J. Opt. Soc. Am. B 37(7) 1921-1926 (2020)
Fang Zeng, Longfang Ye, Li Li, Zhihui Wang, Wei Zhao, and Yong Zhang
Opt. Express 27(23) 33826-33839 (2019)