Probing the strength of light–matter interaction in semiconductor microcavities by using resonant-mode shifts in temperature-dependent photoluminescence spectra
Sheng-Chan Wu,
Chung-Xian Yang,
Jer-Shing Huang,
Yia-Chung Chang,
Ching-Hang Chien,
Hsu-Cheng Hsu
Affiliations
Sheng-Chan Wu
Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan
Chung-Xian Yang
Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan
Jer-Shing Huang
Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
Yia-Chung Chang
Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
Ching-Hang Chien
Institute of Lighting and Energy Photonics, National Yang Ming Chiao Tung University, Tainan 71150, Taiwan
Hsu-Cheng Hsu
Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan
The Rabi-splitting energy represents the strength of light–matter interaction. This quantity is a good benchmark for evaluating the performance of light-modulation devices. Herein, we adopt ZnO microrods as microcavities for whispering gallery modes and propose a convenient method for estimating the light–matter coupling strength based on the shifts of resonant modes in temperature-dependent photoluminescence spectra from 295 to 77 K. Both temperature-dependent index dispersion and Rabi splitting can be extracted. Additionally, the Rabi-splitting energy of bulk ZnO at 0 K is estimated to be about 289 meV.
