Optical phonon scattering of cavity polaritons in an electroluminescent device

TL;DR

This paper reports the observation of optical phonon scattering of cavity polaritons in an electroluminescent device, demonstrating strong light-matter coupling effects and phonon interactions through electroluminescence spectra.

Contribution

It provides experimental evidence of phonon-polariton interactions in an electrically driven microcavity device operating in the strong coupling regime.

Findings

Observation of phonon replica in electroluminescence spectrum

Resonant population of upper polariton branch via electrical bias

Evidence of phonon scattering affecting polariton states

Abstract

A signature of the scattering between microcavity polaritons and longitudinal optical phonons has been observed in the electroluminescence spectrum of an intersubband device operating in the light-matter strong coupling regime. By electrical pumping we resonantly populate the upper polariton branch at different energies as a function of the applied bias. The electroluminescent signal arising from these states is seconded by a phonon replica from the lower branch.