10.1021/acsphotonics.7b01593.s001 Wenna Du Wenna Du Shuai Zhang Shuai Zhang Jia Shi Jia Shi Jie Chen Jie Chen Zhiyong Wu Zhiyong Wu Yang Mi Yang Mi Zhixiong Liu Zhixiong Liu Yuanzheng Li Yuanzheng Li Xinyu Sui Xinyu Sui Rui Wang Rui Wang Xiaohui Qiu Xiaohui Qiu Tom Wu Tom Wu Yunfeng Xiao Yunfeng Xiao Qing Zhang Qing Zhang Xinfeng Liu Xinfeng Liu Strong Exciton–Photon Coupling and Lasing Behavior in All-Inorganic CsPbBr<sub>3</sub> Micro/Nanowire Fabry-Pérot Cavity American Chemical Society 2018 waveguided output spectra application CVD method Lasing Behavior group index strength 656 meV light source threshold polariton lasing CsPbBr 3 cavity quality CsPbBr 3 room temperature lasing threshold polariton lasing light-emitting diodes vacuum Rabi splitting mode volume lasing spectra PL spectra 2018-03-13 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Strong_Exciton_Photon_Coupling_and_Lasing_Behavior_in_All-Inorganic_CsPbBr_sub_3_sub_Micro_Nanowire_Fabry-Pe_rot_Cavity/6005312 All-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 CsPbBr<sub>3</sub> micro/nanowires synthesized by a CVD method. By exploring spatial resolved PL spectra of CsPbBr<sub>3</sub> 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.