Broadband infrared polarizer of graphene wire grids with flat PER curves
Jinlin Qi,
Yaodong Zhou,
Yichen Xu,
Qingyan Deng,
Kaihui Liu,
Xiaozhi Xu,
Xu Zhou
Affiliations
Jinlin Qi
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou 510006, China
Yaodong Zhou
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou 510006, China
Yichen Xu
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou 510006, China
Qingyan Deng
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou 510006, China
Kaihui Liu
State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China
Xiaozhi Xu
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou 510006, China
Xu Zhou
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou 510006, China
Since 2004, the flourishing two-dimensional graphene has sparked extensive research on graphene-based optical and optoelectronic devices with high performance due to its ultra-fast photoelectric response, broadband, and tunable optical response. However, up until now, graphene-based wire grid polarizers have not been demonstrated to perform excellent characteristics with flat polarization extinction ratio (PER) curves, while they all exhibited narrow peak-shaped working bands. Here, we propose a broadband polarizer based on graphene wire grids with a flat PER curve of up to ∼84.5 dB in the ultrawide range of 1–10 μm. In the range of <4 μm, the graphene wire grid polarizer exhibits a strong plasmon resonance effect and outputs a linear-polarized state. Its performance is closely related to carrier density that is tuned by the Fermi level (EF) and thickness of graphene.
