Dual-band perfect absorption graphene metasurface with high modulation in near-infrared

Graphene has garnered significant attention in tunable metasurfaces due to its unique optical properties. The absorption of the graphene metassurface can be dynamically adjusted by manipulating the chemical potential. However, the working wavelengths of most graphene metasurfaces are limited in terahertz and mid-infrared, or have a low reflection range. In this paper, we design a hybrid graphene metasurface with a slot structure. The working wavelengths are optimized to 1550 nm and 1910 nm. Additionally, the slot structure greatly enhances the field intensity near the monolayer graphene to improve its interaction with light. As a result, perfect absorption is achieved at both working wavelengths, along with a maximum reflection range of 0.9 and a modulation depth of 99%.