Broadband electromagnetically induced transparency-like manipulation of graphene-black phosphorus hybrid metasurface

Plasmonics of two-dimensional materials provides a platform for enhancing light-matter interactions and offers a variety of novel applications in the terahertz range. In this work, we theoretically and numerically investigate the broadband tunable electromagnetically induced transparency-like (EIT)-like effect based on graphene-black phosphorus (G-BP) metasurface. The designed structural unit consists of a circular G-BP disk placed between two parallel G-BP strips, both of which operate in bright mode. It can achieve a broadband EIT-like effect that performs beyond individual graphene and BP films, where the underlying physical mechanism is the near-field coupling of resonator elements and the coupling of two bright-bright modes. In addition, we can flexibly adjust the transparency window of the EIT-like effect by changing the geometric parameters, polarization angle, and Fermi energy level of G-BP. The finite-difference time-domain simulation results agree well with the results of the theoretical analysis based on the coupled Lorentz oscillator model. Moreover, the proposed structure exhibits excellent dispersion accompanied with a group index of similar to 60, which provides theoretical guidance for slow-light optical devices.

Automated summary

Plasmonics in two-dimensional materials provide a platform for enhancing light-matter interactions and novel applications in the terahertz range. This study investigates a broadband tunable electromagnetically induced transparency-like effect using a graphene-black phosphorus metasurface, showing excellent dispersion properties for slow-light optical devices. The physical mechanism involves near-field coupling of resonator elements and coupling of two bright-bright modes.