从减少维度钙钛矿微板中激光：法布里-珀罗或回音壁模式？

Lasing from reduced dimensional perovskite microplatelets: Fabry-Pérot or whispering-gallery-mode?

机构信息

Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro and Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, China.

Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.

出版信息

J Chem Phys. 2019 Dec 7;151(21):211101. doi: 10.1063/1.5127946.

DOI:10.1063/1.5127946

PMID:31822097

Abstract

Cesium lead bromide (CsPbBr) perovskite has attracted great attention recently for its potentials for next-generation green-color lasing devices owing to the relatively high structural stability and the high emission efficiency among the perovskite family. Herein, we explore the origins of cavity modes in CsPbBr microplatelets (MPs) lasers by using angle-resolved microphotoluminescence Fourier imaging technique, which is still controversial so far. In-plane Fabry-Pérot (F-P) mode lasing transition to whispering-gallery-mode (WGM) lasing is verified at room temperature, which mostly occurs in large MPs with edge length (L) over 13 μm. The F-P lasing is suppressed upon decreasing L or increasing excitation density, and the WGM lasing is predominant for all MPs at high excitation density. Furthermore, the parity and symmetry of in-plane F-P modes are classified. These results advance the fundamental understanding of lasing modes in planar microcavities as well as their applications in on-chip interconnection and quantum optics.

摘要

铯铅溴（CsPbBr）钙钛矿因其在钙钛矿家族中具有较高的结构稳定性和较高的发射效率，在下一代绿色激光器件方面引起了极大的关注。在此，我们通过使用角分辨微光荧光傅里叶成像技术来探索 CsPbBr 微板（MPs）激光器腔模的起源，这到目前为止仍然存在争议。在室温下，验证了面内法布里-珀罗（F-P）模式激光跃迁到 whispering-gallery-mode（WGM）激光，这主要发生在边长（L）大于 13μm 的大 MPs 中。随着 L 的减小或激发密度的增加，F-P 激光被抑制，而对于所有 MPs，在高激发密度下，WGM 激光占主导地位。此外，对平面 F-P 模式的奇偶性和对称性进行了分类。这些结果推进了对平面微腔中激光模式的基本理解，以及它们在片上互连和量子光学中的应用。