Parametric polariton amplification in semiconductor microcavities

TL;DR

This paper reports experimental observations of coherent parametric polariton amplification in semiconductor microcavities, highlighting threshold behavior, spectral blue shift, and phase dependence as signatures of nonlinear wave mixing.

Contribution

It provides the first experimental demonstration of phase-dependent coherence in parametric polariton amplification within semiconductor microcavities.

Findings

Threshold dependence of emission on pump power

Spectral blue shift observed in emission

Phase dependence confirms coherent wave mixing

Abstract

We present novel experimental results demonstrating the coherence properties of the nonlinear emission from semiconductor microcavities in the strong coupling regime, recently interpreted by parametric polariton four-wave mixing. We use a geometry corresponding to degenerate four-wave mixing. In addition to the predicted threshold dependence of the emission on the pump power and spectral blue shift, we observe a phase dependence of the amplification which is a signature of a coherent polariton wave mixing process.