Generation of coherence light in ZnO whispering gallery microresonators
Hsu-Cheng Hsu1*, Zen-Jia Jiang1, Ya-Tang Chuang1, Ting-Wei Chen2, Szu-Cheng Cheng2
1Department of Photonics, National Cheng Kung University, Tainan, Taiwan
2Department of Optoelectric Physics, Chinese Culture University, Taipei, Taiwan
* presenting author:Hsu-Cheng Hsu,
The exciton-polariton lasing of whispering gallery modes in single ZnO microrod was investigated by angle-resolved micro-photoluminescence spectroscopy at room temperature. A large Rabi splitting was obtained using the coupled oscillator model and the experimental blue shift is consistent with the theoretical prediction. At the threshold, we observed the lasing phenomena with emission peaks accompanied with linewidth narrowing bueshift and linewidth broadening were observed with increasing excitation power, which are the fingerprints of exciton-polariton lasing. The behavior of the spatial coherence was characterized by Young’s double-slit experiment measurement.

Keywords: ZnO, exciton-polariton, microcavity