Cascaded third harmonic generation in hybrid graphene-semiconductor waveguides

TL;DR

This paper demonstrates that hybrid graphene-semiconductor waveguides can efficiently generate third harmonics through cascaded nonlinear interactions, significantly enhancing output compared to non-cascaded methods.

Contribution

It introduces a comprehensive model for cascaded third harmonic generation in hybrid waveguides and shows phase-matching of multiple harmonics for increased efficiency.

Findings

Third harmonic output increased by a factor of 5 with cascaded process.

Hybrid waveguides support phase-matched interactions of fundamental, second, and third harmonics.

Model predicts efficient cascaded harmonic generation in integrated plasmonic structures.

Abstract

We study cascaded harmonic generation of hybrid surface plasmons in integrated planar waveguides composed of a graphene layer and a doped-semiconductor slab. We derive a comprehensive model of cascaded third harmonic generation through phase-matched nonlinear interaction of fundamental, second harmonic and third harmonic plasmonic modes supported by the structure. We show that hybrid graphene-semiconductor waveguides can simultaneously phase-match these three interacting harmonics, increasing the total third-harmonic output by a factor of 5 compared to the non-cascaded regime.