Li Fangtao, Jiang Mingming, Cheng Yang, Zhang Yufei, Yang Zheng, Peng Yiyao, Ma Wenda, Chen Qiushuo, Wang Chunfeng, Liu Kaihui, Wang Rongming, Lu Junfeng, Pan Caofeng
CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences, Beijing 100083, P. R. China.
College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China.
Nanoscale. 2021 Mar 4;13(8):4432-4438. doi: 10.1039/d0nr08644d.
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.
无机卤化铅钙钛矿（CsPbX3，X = Cl、Br、I）纳米线（NWs）因其具有波长可调、阈值低、稳定性优异和制备简便等引人关注的特性而被应用于激光器中。然而，目前的CsPbX3 NW激光器通常以多模模式工作，由于相关的错误信号，阻碍了它们在光通信中的实际应用。在这项工作中，通过聚焦离子束（FIB）铣削方法在高质量的单晶CsPbBr3 NWs中设计和制造耦合腔，实现了高性能单模激光发射。实验和时域有限差分（FDTD）模拟表明，得益于游标效应，单模激光器的阈值为20.1 μJ cm-2，品质因数高达约2800。这些结果证明了CsPbX3 NW激光器在光通信和集成光电器件方面具有广阔的应用潜力。
