Subwavelength-Polarized Quasi-Two-Dimensional Perovskite Single-Mode Nanolaser
Zhengzheng Liu, Manchen Hu, Juan Du, Tongchao Shi, Ziyu Wang, Zeyu Zhang, Zhiping Hu, Z. Zhan, Keqiang Chen, Weimin Liu, Jiang Tang, Han Zhang, Yuxin Leng, Ruxin Li
Abstract
When approaching the subwavelength or deep subwavelength scale, there is a fundamental trade-off between the ultimate shrinking size and the performance for miniaturized lasers. Herein, to overcome this trade-off, we investigated the excitonic gain nature of quasi-two-dimensional (quasi-2D) perovskites and revealed that both singlet excitons and polarons would make nearly the entire contribution within ∼50 ps to a high net gain of 558 cm–1. Inspired by the gain characteristic, we successfully shrank the quasi-2D perovskites laser to the subwavelength scale using only a layer of ultraviolet glue and a glass substrate in the vertical dimension. In spite of the compact and simple cavity structure, single-mode lasing with a highly linear polarization degree of 81% and a quality factor of 1635 was achieved. The extremely short cavity, excellent lasing performance, and simple structure of the quasi-2D perovskite laser are expected to provide insights into next-generation integrated laser sources.