Propagation and amplification dynamics of 1D polariton condensates

TL;DR

This paper investigates the propagation and amplification of 1D polariton condensates, demonstrating a large-bandwidth polariton amplifier that enables high-density polariton transport over macroscopic distances.

Contribution

It provides the first experimental demonstration of a polariton amplifier driven by bosonic stimulated relaxation in one-dimensional microcavities.

Findings

Amplification occurs when condensates pass through non-resonant excitation areas.

Amplification results from bosonic stimulated relaxation of reservoir excitons.

The polariton amplifier has a large bandwidth, facilitating long-distance polariton transport.

Abstract

The dynamics of propagating polariton condensates in one-dimensional microcavities is investigated through time resolved experiments. We find a strong increase in the condensate intensity when it travels through the non-resonantly excited area. This amplification is shown to come from bosonic stimulated relaxation of reservoir excitons into the polariton condensate, allowing for the repopulation of the condensate through non-resonant pumping. Thus, we experimentally demonstrate a polariton amplifier with a large band width, opening the way towards the transport of polaritons with high densities over macroscopic distances.