Exciton-polariton lasing properties of ZnO whispering gallery mode microcavity

Abstract

We demonstrate the effects of exciton-polariton in a ZnO microcavity investigated by angle-resolved micro-photoluminescence spectroscopy at room temperature The one-dimensional hexagonal ZnO microcavities synthesized by vapor phase transport method provide an optical cavity of whispering gallery modes (WGMs) and laser gain medium as well The photon propagates in the hexagonal cross section plane as a result of multiple total internal reflections at the ZnO/air interface Therefore the exciton of ZnO strongly coupled to the WGM can form exciton-polariton The polariton presents the anticrossing behavior in energy momentum diagram showing the strong interaction between exciton and cavity photon existed inside the ZnO microcavity under low carrier density excitation Upon pulse laser pumping we observe lasing action of the emission peaks and the blueshift of the polariton modes An exciton-polariton condensation is also observed at room temperature throughout the power-dependent angle-resolve photoluminescence spectra

Date of Award	2014 Aug 15
Original language	English
Supervisor	Hsu-Cheng Hsu (Supervisor)