Tunable subwavelength strong absorption by graphene wrapped dielectric particles

The optical absorption properties of graphene-wrapped dielectric particles have been investigated within the framework of the Mie theory. It is shown that subwavelength strong absorption in infrared spectra can take place in such systems due to the excitation of plasmon resonance in graphene. The absorption characteristics and efficiency are tunable by either varying the Fermi level and the damping constant of graphene, or by changing the size and the dielectric constant of small particles. These characteristics also depend on the separation distance between particles in the cluster. These extreme light resonances and absorptions in graphene-wrapped nanostructures have great potential for optoelectronic devices.