多层核壳结构增强石墨烯的光学吸收

he absorption enhancment properties of graphene by Dielectric-Silver-Graphene concentric core-shell nanoparticles have been theoretically studied using Mie theory. The mechanism behind the absorption enhancement is the interference between internal Mie modes within the metal and graphene shells. The optical resonance of these nanoparticles can be varied over hundreds of nanometers in wavelength across the visible and near-infrared range by varying the thicknesses of the metal shell. The tunable strong absorption in visible and near-infrared range can be obtained by changing the sizes of the dielectric core and metal shell.Our results can be important to enhance absorption in graphenewith potential applications to photodetection and image sensor.