Robust exciton-polariton effect in a ZnO whispering gallery microcavity at high temperature

摘要

A robust exciton-polariton effect in a ZnO whispering gallery microcavity well above room temperature is presented. The lower polariton branches are tuned by current induced thermal effect. The red shift can be as large as ～40meV. It is found that the strong coupling can be preserved and the polariton-phonon interaction quenching effect remains up to ~550K, while the Rabi splitting is about 330 meV. The tuning speed is in the order of millisecond, showing its potential in polariton-based optoelectronic device application.