# Excitation of localized graphene plasmons by a metallic slit

## TL;DR

This paper demonstrates that localized graphene surface plasmons can be excited via a metallic slit, with their resonance tunable by doping or dielectric environment, enabling potential applications in plasmonic sensing.

## Contribution

It introduces a novel method to excite and tune localized graphene plasmons using a metallic slit, advancing plasmonic sensor design.

## Key findings

- Plasmons are excited by incident electromagnetic waves on graphene-covered slits.
- Resonance peaks in absorption spectra indicate plasmon excitation.
- Peak positions are tunable by doping level and dielectric properties.

## Abstract

In this paper we show that graphene surface plasmons can be excited when an electromagnetic wave packet impinges on a single metal slit covered with graphene. The excitation of the plasmons localized over the slit is revealed by characteristic peaks in the absorption spectrum. It is shown that the position of the peaks can be tuned either by the graphene doping level or by the dielectric function of the material filling the slit. The whole system forms the basis for a plasmonic sensor when the slit is filled with an analyte.