Tunable plasmonic enhancement of light scattering and absorption in graphene-coated subwavelength wires

TL;DR

This paper demonstrates how graphene coating on subwavelength wires can be tuned to significantly enhance light scattering and absorption through localized surface plasmon resonances, with potential for dynamic control.

Contribution

It introduces a method to dynamically tune plasmonic resonances in graphene-coated wires, enabling controlled enhancement of light scattering and absorption.

Findings

Resonant excitation of localized surface plasmons enhances scattering and extinction.

Enhancement is specific to p-polarized incident waves.

Tuning graphene's chemical potential shifts the resonance frequencies.

Abstract

The electromagnetic response of subwavelength wires coated with a graphene monolayer illuminated by a linearly polarized plane waves is investigated. The results show that the scattering and extintion cross-sections of the coated wire can be dramatically enhanced when the incident radiation resonantly excites localized surface plasmons. The enhancements occur for p--polarized incident waves and for excitation frequencies that correspond to complex poles in the coefficients of the multipole expansion for the scattered field. By dynamically tuning the chemical potential of graphene, the spectral position of the enhancements can be chosen over a wide range.