Measurement of the second-order coherence function for metallic nanolasers

TL;DR

This paper demonstrates a method to measure the second-order coherence function of metallic nanolasers, confirming their ability to produce coherent radiation despite high spontaneous emission, using a modified Hanbury Brown and Twiss setup.

Contribution

It introduces a novel measurement approach for coherence properties of broad linewidth nanolasers in the near-infrared band.

Findings

Metallic nanolasers can generate coherent radiation.

The measurement method is effective for broad linewidth sources.

Coherence confirmed for coaxial and disk-shaped nanolasers.

Abstract

Due to the high spontaneous emission coupled into the resonance mode in metallic nanolasers, there has been a debate concerning the coherence properties of this family of light sources. The second-order coherence function can unambiguously determine the nature of a given radiation. In this paper, an approach to measure the second-order coherence function for broad linewidth sources in the near-infrared telecommunication band is established based on a modified Hanbury Brown and Twiss configuration. Using this set-up, it is shown that metallic coaxial and disk-shaped nanolasers with InGaAsP multiple quantum well gain systems are indeed capable of generating coherent radiation.