Slow-light analysis based on tunable plasmon-induced transparency in patterned black phosphorus metamaterial

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 mono layer 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. (C) 2021 Optical Society of America

Automated summary

A tunable plasmon-induced transparency structure based on monolayer black phosphorus metamaterial was designed, with the interaction between bright and dark modes effectively adjusted through varying geometrical parameters and carrier concentration. This study offers a new possibility for practical applications of black phosphorus in micro-nano slow-light devices, demonstrating excellent slow-light performance with a group index as high as 139.