Tunable broadband light emission from graphene

TL;DR

This paper demonstrates tunable broadband light emission from graphene by integrating it with photonic cavities and managing heat transfer, enabling potential ultrafast graphene-based light sources.

Contribution

It introduces a method to control graphene's emission wavelength and bandwidth through cavity integration and thermal management techniques.

Findings

Emission wavelength tunable via photonic cavity integration

Thermal management achieved with hexagonal boron nitride

Potential for ultrafast broadband graphene light emitters

Abstract

Graphene is an ideal material for integrated nonlinear optics thanks to its strong light-matter interaction and large nonlinear optical susceptibility. Graphene has been used in optical modulators, saturable absorbers, nonlinear frequency converters, and broadband light emitters. For the latter application, a key requirement is the ability to control and engineer the emission wavelength and bandwidth, as well as the electronic temperature of graphene. Here, we demonstrate that the emission wavelength of graphene$'$ s broadband hot carrier photoluminescence can be tuned by integration on photonic cavities, while thermal management can be achieved by out-of-plane heat transfer to hexagonal boron nitride. Our results pave the way to graphene-based ultrafast broadband light emitters with tunable emission.