Superimposed multilayer randomly distributed graphene quantum dots and broadband terahertz perfect absorber

For investigating broadband perfect absorption in the Terahertz region, a multilayer structure using superimposed Graphene quantum dots with Gaussian distribution radius is proposed. At first, three-layer metamaterial structure, which composed of graphene at top layer, dielectric material middle and finally gold layer bottom considered investigated. The for three radii 400, 450, 500 nm considered. Results proposed including 3, 5, 7 layers are extracted compared. Simulation results 7-layer case show range (4.2 to 8.1 THz), (4.3 8.71 THz) value above 70%. Si3N4 structure.