Design of Ultra-compact Graphene-based Superscatterers

TL;DR

This paper presents a novel method for designing ultra-compact graphene-based superscatterers by dispersion engineering, significantly enhancing scattering cross sections at subwavelength scales.

Contribution

It introduces a dispersion engineering approach using the Bohr model to design ultra-compact graphene superscatterers with overlapped resonances.

Findings

Scattering cross section increased by five orders of magnitude.

Resonance peaks from multiple scattering orders are overlapped.

Design achieves deep subwavelength superscattering.

Abstract

The energy-momentum dispersion relation is a fundamental property of plasmonic systems. In this paper, we show that the method of dispersion engineering can be used for the design of ultra-compact graphene-based superscatterers. Based on the Bohr model, the dispersion relation of the equivalent planar waveguide is engineered to enhance the scattering cross section of a dielectric cylinder. Bohr conditions with different orders are fulfilled in multiple dispersion curves at the same resonant frequency. Thus the resonance peaks from the first and second order scattering terms are overlapped in the deepsubwavelength scale by delicately tuning the gap thickness between two graphene layers. Using this ultra-compact graphene-based superscatterer, the scattering cross section of the dielectric cylinder can be enhanced by five orders of magnitude.