Terahertz emission from multiple-microcavity exciton-polariton lasers

TL;DR

This paper proposes a novel multiple-microcavity scheme to enhance terahertz emission from exciton-polariton lasers by reducing non-radiative losses, potentially improving the efficiency of terahertz sources.

Contribution

It introduces a new multi-microcavity approach that significantly reduces non-radiative scattering losses compared to single cavities, boosting terahertz emission efficiency.

Findings

Double cavity devices show lower non-radiative loss rates.

Enhanced terahertz emission efficiency in multiple microcavities.

Comparison demonstrates the advantage over single cavity systems.

Abstract

Terahertz emission between exciton-polariton branches in semiconductor microcavities is expected to be strongly stimulated in the polariton laser regime, due to the high density of particles in the lower state (final state stimulation effect). However, non-radiative scattering processes depopulate the upper state and greatly hinder the efficiency of such terahertz sources. In this work, we suggest a new scheme using multiple microcavities and exploiting the transition between two interband polariton branches located below the exciton level. We compare the non-radiative processes loss rates in single and double cavity devices and we show that a dramatic reduction can be achieved in the latter, enhancing the efficiency of the terahertz emission.