Room temperature terahertz polariton emitter

TL;DR

This paper demonstrates room temperature terahertz emission from parabolic quantum wells coupled to LC resonators in the ultra strong coupling regime, advancing practical terahertz sources.

Contribution

It introduces a system of parabolic quantum wells with LC resonators achieving room temperature terahertz emission in the ultra strong coupling regime.

Findings

Achieved terahertz emission at room temperature.

Demonstrated ultra strong coupling in quantum well-resonator systems.

Showed potential for practical terahertz devices.

Abstract

The strong-coupling regime between an electronic transition and the photonic mode of a optical resonator manifests itself in the lifting of the degeneracy between the two modes and the creation of two polariton states with mixed optical and electronic character. This phenomenon has been studied in atoms, excitons in semiconductors and quantum electrodynamics circuits based on Josephson junctions. Recently, there is also strong interest to study similar effects using intersubband transitions in quantum wells in the terahertz, where the ultra strong coupling regime can be reached and new physical effects have been predicted. An other interesting feature of this system is that, in contrast to systems based on superconductors, the ultra strong coupling regime can be maintained up to room temperature. In this work, we demonstrate that parabolic quantum wells coupled to LC circuit resonators in the ultra strong coupling regime can achieve terahertz emission up to room temperature.