Single-mode lasing of CsPbBr<sub>3</sub> perovskite NWs enabled by the Vernier effect
Fangtao Li, Mingming Jiang, Yang Cheng, Yufei Zhang, Zheng Yang, Yiyao Peng, Wenda Ma, Qiushuo Chen, Chunfeng Wang, Kaihui Liu, Rongming Wang, Junfeng Lu, Caofeng Pan
Abstract
Inorganic lead halide perovskite (CsPbX3, X = Cl, Br, I) NWs (NWs) have been employed in lasers due to their intriguing attributes of tunable wavelength, low threshold, superior stability, and easy preparation. However, current CsPbX3 NW lasers usually work in a multi-mode modal, impeding their practical applications in optical communication due to the associated false signaling. In this work, high-performance single-mode lasing has been demonstrated by designing and fabricating coupled cavities in the high-quality single-crystal CsPbBr3 NWs via the focused ion beam (FIB) milling approach. The single-mode laser shows a threshold of 20.1 μJ cm-2 and a high quality factor of ∼2800 profiting from the Vernier effect, as demonstrated by the experiments and finite-different time-domain (FDTD) simulations. These results demonstrate the promising potentials of the CsPbX3 NW lasers in optical communication and integrated optoelectronic devices.