Guided polariton condensate in perovskite microwires

TL;DR

This paper investigates exciton-polariton condensates in perovskite microwires, demonstrating their long-distance propagation, directional emission, and the influence of structural defects on emission efficiency, advancing integrated photonic applications.

Contribution

It introduces a multi-angle detection method to analyze polariton condensation and reveals how defects can enhance emission by aligning condensate momentum.

Findings

Polariton condensates can propagate over tens of micrometers.

Structural defects can enhance emission by aligning momentum.

Spectrally narrow emission observed at the microwire end.

Abstract

Perovskite microwires are promising candidates for integrated photonic systems due to their strong nonlinear optical response and inherent waveguiding capabilities. In this study, we focus on the directional emission properties of exciton-polariton condensates formed within perovskite microwires, with emphasis on emission collected from the microwire end. We constructed a multi-angle optical detection setup that allows us to identify the exciton-polariton condensation threshold and track the evolution of the condensate for different excitation position along and across the microwire. We observe spectrally narrow exciton-polariton condensate emission from the microwire end even when the condensate is generated tens of micrometers away, which demonstrates the ability of the exciton-polariton condensate to propagate over long distances within the microwire. Furthermore, we find that the presence of structural defects near the condensate location can significantly enhance the emission from the microwire end due to aligning the condensate's momentum with the waveguide direction, thereby facilitating more efficient propagation.