Tunable subwavelength strong absorption by graphene wrapped dielectric particles

TL;DR

This paper demonstrates that graphene-wrapped dielectric particles exhibit tunable, subwavelength strong absorption in infrared spectra due to plasmon resonance, with potential applications in opto-electronic devices.

Contribution

It introduces a theoretical analysis of tunable strong absorption in graphene-wrapped dielectric particles using Mie scattering and multi-scattering methods.

Findings

Strong infrared absorption due to plasmon resonance in graphene.

Absorption tunable by Fermi level, damping, size, and dielectric constant.

Inter-particle separation affects absorption characteristics.

Abstract

The optical absorption properties of graphene wrapped dielectric particles have been investigated by using Mie scattering theory and exact multi-scattering method. 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 varying Fermi level and damping constant of graphene, or by changing size and dielectric constant of small particles. For a cluster of these particles, the absorption characteristics are also affected by the separation distance between them. These extreme light resonances and absorptions in graphene wrapped nanostructures have great potential for opto-electronic devices.