Cai Yijun, Li Shuangluan, Zhou Yuanguo, Wang Xuanyu, Xu Kai-Da, Guo Rongrong, Joines William T
Fujian Provincial Key Laboratory of Optoelectronic Technology and Devices, Xiamen University of Technology, Xiamen, 361024, China.
College of Communication and Information Engineering, Xi'an University of Science and Technology, Xi'an, 710054, China.
Nanoscale Res Lett. 2019 Nov 21;14(1):346. doi: 10.1186/s11671-019-3182-9.
We numerically propose a dual-band absorber in the infrared region based on periodic elliptical graphene-black phosphorus (BP) pairs. The proposed absorber exhibits near-unity anisotropic absorption for both resonances due to the combination of graphene and BP. Each of the resonances is independently tunable via adjusting the geometric parameters. Besides, doping levels of graphene and BP can also tune resonant properties effectively. By analyzing the electric field distributions, surface plasmon resonances are observed in the graphene-BP ellipses, contributing to the strong and anisotropic plasmonic response. Moreover, the robustness for incident angles and polarization sensitivity are also illustrated.
我们在数值上提出了一种基于周期性椭圆石墨烯-黑磷（BP）对的红外区域双频吸收器。由于石墨烯和BP的结合，所提出的吸收器对两种共振均表现出近乎单位的各向异性吸收。通过调整几何参数，每种共振均可独立调谐。此外，石墨烯和BP的掺杂水平也能有效调节共振特性。通过分析电场分布，在石墨烯-BP椭圆中观察到表面等离子体共振，这有助于产生强烈的各向异性等离子体响应。此外，还展示了该吸收器对入射角的鲁棒性和偏振敏感性。
