Superradiant terahertz emission by dipolaritons

TL;DR

This paper demonstrates that dipolaritons in double quantum wells can generate superradiant terahertz emission through oscillations of exciton densities, with potential enhancement via a THz cavity.

Contribution

It introduces a novel mechanism for THz emission using dipolaritons and explores how cavity coupling can enhance this superradiant effect.

Findings

Dipolaritons exhibit Rabi oscillations inducing THz emission.

Superradiant THz emission can be enhanced with a supplementary cavity.

Oscillations of indirect excitons drive the THz signal.

Abstract

Dipolaritons are mixed light-matter quasiparticles formed in double quantum wells embedded in microcavities. Due to resonant coupling between direct and indirect excitons via electronic tunnelling, dipolaritons possess large dipole moments. Resonant excitation of the cavity mode by a short pulse of light induces oscillations of the indirect exciton density with a characteristic frequency of Rabi flopping. This results in oscillations of classical Hertz dipoles array which generate supperradiant emission on a terahertz (THz) frequency. Resulting THz signal may be enhanced using the supplementary THz cavity in the weak coupling regime.