Active control of plasmon-induced transparency with large tunability and high Q-factor in graphene-black phosphorus hybrid system

Plasmon-induced transparency phenomena in the mid-infrared caused by the coupling behavior between dipole (bright element) and higher-order modes (dark element) in graphene as well as black phosphorus (BP) nanoribbons are investigated. The transparent windows can be adjusted flexibly by varying the carrier concentration of graphene and BP. It is also shown that the carrier mobility and refractive index of the substrate are the key factors affecting destructive interference. Obvious group delays are obtained near the transparent windows so that the slow light effect can be achieved. Our results allow a better understanding of efficient exploration of surface plasmons with integrated properties of building blocks from a family of two-dimensional materials, with the aim of expanding both photonic bands and functionalities.

Automated summary

The study investigates plasmon-induced transparency phenomena in the mid-infrared caused by the coupling behavior between dipole and higher-order modes in graphene and black phosphorus nanoribbons. It shows that the transparent windows can be adjusted flexibly by varying the carrier concentration, and the carrier mobility and refractive index of the substrate are key factors affecting destructive interference. Obvious group delays near the transparent windows allow for achieving the slow light effect and help in understanding efficient exploration of surface plasmons with integrated properties from a family of two-dimensional materials.