Polariton lasing in high-quality Selenide-based micropillars in the strong coupling regime

TL;DR

This paper reports the development of high-quality ZnSe-based micropillars that achieve polariton lasing in the strong coupling regime at cryogenic temperatures, with low thresholds due to minimized sidewall roughness and suppressed polariton escape.

Contribution

The authors demonstrate all-epitaxial ZnSe micropillars exhibiting strong coupling and polariton lasing, highlighting fabrication techniques that reduce threshold and improve performance.

Findings

Achieved polariton lasing in ZnSe micropillars at cryogenic temperatures.

Low lasing threshold due to high quality factors and smooth sidewalls.

Suppressed in-plane polariton escape enhances lasing efficiency.

Abstract

We have designed and fabricated all-epitaxial ZnSe-based optical micropillars exhibiting the strong coupling regime between the excitonic transition and the confined optical cavity modes. At cryogenic temperatures, under non-resonant pulsed optical excitation, we demonstrate single transverse mode polariton lasing operation in the micropillars. Owing to the high quality factors of these microstructures, the lasing threshold remains low even in micropillars of the smallest diameter. We show that this feature can be traced back to a sidewall roughness grain size below 3 nm, and to suppressed in-plane polariton escape.