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Strong Exciton–Photon Coupling and Lasing Behavior in All-Inorganic CsPbBr3 Micro/Nanowire Fabry-Pérot Cavity
journal contribution
posted on 2018-03-13, 00:00 authored by Wenna Du, Shuai Zhang, Jia Shi, Jie Chen, Zhiyong Wu, Yang Mi, Zhixiong Liu, Yuanzheng Li, Xinyu Sui, Rui Wang, Xiaohui Qiu, Tom Wu, Yunfeng Xiao, Qing Zhang, Xinfeng LiuAll-inorganic
perovskite micro/nanowire materials hold great promises
as nanoscale coherent light source due to their superior optical and
electronic properties. The coupling strength between exciton and photon
in this system is important for their optical application, however,
is rarely studied. In this work, we demonstrated the strong coupling
of exciton-photon and polariton lasing in high quality CsPbBr3 micro/nanowires synthesized by a CVD method. By exploring
spatial resolved PL spectra of CsPbBr3 cavity, we observed
mode volume dependent coupling strength with a vacuum Rabi splitting
up to 656 meV, as well as significant increase in group index. Moreover,
low threshold polariton lasing was achieved at room temperature within
strong coupling regime; the polariton characteristic is confirmed
by comparing lasing spectra with waveguided output spectra and the
dramatically reduced lasing threshold. Our present results provide
new avenues to achieve high coupling strengths potentially enabling
application of exciting phenomena such as Bose–Einstein condensation
of polaritons, efficient light-emitting diodes, and lasers.