Electromagnetic scattering by a partially graphene-coated dielectric cylinder : efficient computation and multiple plasmonic resonances

TL;DR

This paper introduces an efficient numerical method for analyzing electromagnetic scattering from a dielectric cylinder partially coated with graphene, revealing multiple plasmonic resonances due to surface modes.

Contribution

A novel, simple, and efficient computational approach for modeling scattering from graphene-coated dielectric cylinders with boundary conditions addressing field singularities.

Findings

Identification of multiple plasmonic resonances

Efficient Fourier-Bessel based computational method

Analysis of surface mode contributions

Abstract

We present a numerical approach for the solution of electromagnetic scattering from a dielectric cylinder partially covered with graphene. It is based on a classical Fourier-Bessel expansion of the fields inside and outside the cylinder to which we apply ad-hoc boundary conditions in presence of graphene. Due to the singular nature of the electric field at the edges of the graphene sheet, we introduce auxiliary boundary conditions. The result is particularly simple and very efficient method allowing the study of diffraction from such structures. We also highlight the presence of multiple plasmonic resonances that we ascribe to the surface modes of the coated cylinder.