Coexistence of strong and weak coupling in ZnO nanowire cavities

TL;DR

This paper demonstrates a high-quality ZnO nanowire cavity that exhibits both weak and strong light-matter coupling regimes at room temperature, with observable polariton branches and lasing emission.

Contribution

It introduces a novel ZnO nanowire cavity structure enabling simultaneous weak and strong coupling at room temperature, supported by experimental and simulation data.

Findings

Observation of middle polariton branches

Lasing emission up to room temperature

Simultaneous weak and strong coupling regimes

Abstract

We present a high quality two-dimensional cavity structure based on ZnO nanowires coated with concentrical Bragg reflectors. The spatial mode distribution leads to the simultaneous appearance of the weak and strong coupling regime even at room temperature. Photoluminescence measurements agree with FDTD simulations. Furthermore the ZnO core nanowires allow for the observation of middle polariton branches between the A- and B-exciton ground state resonances. Further, lasing emission up to room temperature is detected in excitation dependent photoluminescence measurements.