Wu Kuan, Li Hongjian, Liu Chao, Xiong Cuixiu, Ruan Banxian, Li Min, Gao Enduo, Zhang Baihui
J Opt Soc Am A Opt Image Sci Vis. 2021 Mar 1;38(3):412-418. doi: 10.1364/JOSAA.413384.
In this paper, a tunable plasmon-induced transparency (PIT) structure based on a monolayer black phosphorus metamaterial is designed. In the structure, destructive interference between the bright and dark modes produces a significant PIT in the midinfrared band. Numerical simulation and theoretical calculation methods are utilized to analyze the tunable PIT effect of black phosphorus (BP). Finite-difference-time-domain simulations are consistent with theoretical calculations by coupled mode theory in the terahertz frequency band. We explored the anisotropy of a BP-based metasurface structure. By varying the geometrical parameters and carrier concentration of the monolayer BP, the interaction between the bright and dark modes in the structure can be effectively adjusted, and the active adjustment of the PIT effect is achieved. Further, the structure's group index can be as high as 139, which provides excellent slow-light performance. This study offers a new possibility for the practical applications of BP in micro-nano slow-light devices.
本文设计了一种基于单层黑磷超材料的可调谐表面等离激元诱导透明（PIT）结构。在该结构中，亮模式和暗模式之间的相消干涉在中红外波段产生显著的PIT。利用数值模拟和理论计算方法分析了黑磷（BP）的可调谐PIT效应。在太赫兹频段，时域有限差分模拟与耦合模理论的理论计算结果一致。我们探究了基于BP的超表面结构的各向异性。通过改变单层BP的几何参数和载流子浓度，可以有效调节结构中亮模式和暗模式之间的相互作用，实现对PIT效应的主动调控。此外，该结构的群折射率可高达139，具有优异的慢光性能。本研究为BP在微纳慢光器件中的实际应用提供了新的可能性。
