▎ 摘　　要

NOVELTY - The utility model claims a dumbbell grating-based near infrared broadband perfect absorber, wherein it is a five-layer structure, comprising from bottom to top in turn is provided of silicon substrate, which is used for increasing the gold incident absorption of electromagnetic wave. for increasing the absorption rate of the electromagnetic wave incident silicon dioxide buffer layer, for increasing the mechanical strength of the whole and enhanced electromagnetic field interacts with the graphene increases absorption of the incident electromagnetic wave, dumbbell grating incidence for reducing the reflection of the electromagnetic wave and capable of generating broadband resonance absorbing function. on the upper surface of dumbbell gratings are horizontally set on the graphene layer, it is it is simple in preparation, wide absorption bandwidth, high absorbing rate.