標題: Characteristics of exciton-polaritons in ZnO-based hybrid microcavities
作者: Chen, Jun-Rong
Lu, Tien-Chang
Wu, Yung-Chi
Lin, Shiang-Chi
Hsieh, Wen-Feng
Wang, Shing-Chung
Deng, Hui
光電工程學系
Department of Photonics
公開日期: 28-Feb-2011
摘要: Wide bandgap semiconductors are promising materials for the development of polariton-based optoelectronic devices operating at room temperature (RT). We report the characteristics of ZnO-based microcavities (MCs) in the strong coupling regime at RT with a vacuum Rabi splitting of 72 meV. The impact of scattering states of excitons on polariton dispersion is investigated. Only the lower polariton branches (LPBs) can be clearly observed in ZnO MCs since the large vacuum Rabi splitting pushes the upper polariton branches (UPBs) into the scattering absorption states in the ZnO bulk active region. In addition, we systematically investigate the polariton relaxation bottleneck in bulk ZnO-based MCs. Angle-resolved photoluminescence measurements are performed from 100 to 300 K for different cavity-exciton detunings. A clear polariton relaxation bottleneck is observed at low temperature and large negative cavity detuning conditions. The bottleneck is suppressed with increasing temperature and decreasing detuning, due to more efficient phonon-assisted relaxation and a longer radiative lifetime of the polaritons. (C) 2011 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.19.004101
http://hdl.handle.net/11536/9278
ISSN: 1094-4087
DOI: 10.1364/OE.19.004101
期刊: OPTICS EXPRESS
Volume: 19
Issue: 5
起始頁: 4101
結束頁: 4112
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