45results about How to "Increased absorption bandwidth" patented technology

The application discloses a multilayer graphene broadband absorber with a heterostructure coupling cavity, which comprises a substrate layer and a plurality of graphene layers arranged on the substrate layer, and a photonic crystal array layer and a flat plate layer are arranged on both sides of each graphene layer; a plurality of heterostructure coupling cavities are formed on the substrate layer through the photonic crystal array layer, the graphene layer and the flat plate layer. The application forms a plurality of coupling cavities based on the photonic crystal array-graphene-flat plate heterostructure through the layering, when electromagnetic waves are incident on the graphene absorber, the graphene is excited to generate surface plasmons, and under the action of the photonic local effect, the energy of the electromagnetic waves is coupled into the surface plasmons, the resonance cavity effect generated by the coupling cavities can increase the coupling effect, thereby improving the absorption efficiency of the graphene absorber; and the coupling cavities can effectively increase the absorption bandwidth, thereby improving the practical application range of the graphene absorber.