Zhou Beier, Zhong Yichi, Jiang Mingming, Zhang Jianhao, Dong Hongxing, Chen Linqi, Wu Hao, Xie Wei, Zhang Long
Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.
Nanoscale. 2020 Mar 14;12(10):5805-5811. doi: 10.1039/c9nr09259e. Epub 2020 Feb 12.
The polarization of lasing, as a fundamental property related to the emission coherence of microlasers, is one of the criteria for a high quality laser beam but has been rarely investigated. Unlike conventional lasers which can be induced by highly polarized seed light or by using a polarizing film, the microlaser for on-chip integrated photonic circuits generally possesses a low degree of polarization due to unpolarized spontaneous emission. Here, we firstly demonstrate that the Vernier effect can be used to improve the degree of polarization from ∼0.2 to 0.78 based on metal halide perovskite microspheres. After coupling, linearly polarized single-mode lasing with a low threshold and high quality can be achieved. In addition, by using the finite element method, the mode distributions of CsPbBr microspheres before and after coupling are analyzed systematically and a clear physical diagram of coupled resonances is obtained. Our work clearly suggests that a coupled linearly polarized single-mode microlaser by the Vernier effect would offer a real step closer to the platform for on-chip integrated photonics.
激光的偏振作为与微激光器发射相干性相关的基本特性，是高质量激光束的标准之一，但很少被研究。与可由高偏振种子光或使用偏振膜诱导的传统激光器不同，用于片上集成光子电路的微激光器由于非偏振自发发射通常具有低偏振度。在此，我们首先证明基于金属卤化物钙钛矿微球，游标效应可用于将偏振度从约0.2提高到0.78。耦合后，可实现具有低阈值和高质量的线偏振单模激光。此外，通过使用有限元方法，系统地分析了CsPbBr微球耦合前后的模式分布，并获得了清晰的耦合共振物理图。我们的工作清楚地表明，通过游标效应实现的耦合线偏振单模微激光器将真正向片上集成光子学平台迈进一步。
