Strong Exciton–Photon Coupling and Lasing Behavior in All-Inorganic CsPbBr3 Micro/Nanowire Fabry-Pérot Cavity

• DOI: 10.1021/acsphotonics.7b01593
• Publication Date: 2018-03-14T02:03:00Z
• Authors: 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 Liu
• Keywords: microcavity; CsPbBr3 nanowires; exciton-photon coupling; waveguide; 02 engineering and technology; polariton lasing; 0210 nano-technology

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 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...