Giant enhancement of the third harmonic in graphene integrated in a layered structure

TL;DR

This paper predicts that integrating graphene into a layered structure significantly enhances third-harmonic generation, potentially increasing intensity by over two orders of magnitude compared to standalone graphene.

Contribution

It introduces a novel layered structure design that dramatically boosts third-harmonic generation efficiency in graphene.

Findings

Third-harmonic intensity can be increased by over 100 times.

Layered structure design enhances nonlinear optical response.

Potential for improved nonlinear optical devices using graphene.

Abstract

Graphene was shown to have strongly nonlinear electrodynamic properties. In particular, being irradiated by an electromagnetic wave with the frequency $\omega$, it can efficiently generate higher frequency harmonics. Here we predict that in a specially designed structure "graphene -- dielectric -- metal" the third-harmonic ($3\omega$) intensity can be increased by more than two orders of magnitude as compared to an isolated graphene layer.