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 of exciting phenomena such as Bose–Einstein condensation of polaritons, efficient light-emitting diodes, and lasers.

中文翻译：

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全无机CsPbBr ₃微/纳米线法布里-珀罗腔中的强激子-光子耦合和激光行为。

全无机钙钛矿微/纳米线材料因其优异的光学和电子性能而有望作为纳米级相干光源。该系统中激子和光子之间的耦合强度对于它们的光学应用很重要，但是很少研究。在这项工作中，我们证明了在通过CVD方法合成的高质量CsPbBr ₃微米/纳米线中，激子光子与极化子激射之间的强耦合。通过探索CsPbBr _3的空间分辨PL光谱在腔中，我们观察到模式体积依赖的耦合强度，其中真空Rabi分裂至656 meV，并且组指数显着增加。此外，在强耦合条件下，在室温下实现了低阈值极化激射。通过比较激光光谱和波导输出光谱以及大大降低的激光阈值，可以确定极化子特性。我们目前的结果提供了实现高耦合强度的新途径，从而有可能实现激发现象的应用，例如极化子的玻色-爱因斯坦凝聚，高效的发光二极管和激光器。