Weng Guoen, Su Zhan, Ye Shoujie, Sun Xinyue, Cao Fuyi, Wang Cong, Jiang Dongxin, Hu Xiaobo, Tao Jiahua, Akiyama Hidefumi, Chu Junhao, Chen Shaoqiang
Opt Lett. 2024 Jul 1;49(13):3713-3716. doi: 10.1364/OL.525331.
We report intriguing continuous-wave quasi-single-mode random lasing in methylammonium lead bromide (CHNHPbBr) perovskite films synthesized on a patterned sapphire substrate (PSS) under excitation of a 532-nm laser diode. The random laser emission evolves from a typical multi-mode to a quasi-single-mode with increasing pump fluences. The full width at half-maximum of the lasing peak is as narrow as 0.06 nm at ∼547.8 nm, corresponding to a high Q-factor of ∼9000. Such excellent random lasing performance is plausibly ascribed to the exciton resonance in optical absorption at 532 nm and the enhanced optical resonance due to the increased likelihood for randomly scattered light to re-enter the optical loops formed among the perovskite grains by multi-reflection at the perovskite/PSS interfaces. This work demonstrates the promise of single-mode perovskite random lasers by introducing the exciton resonance effect and ingeniously designed periodic nano/micro optical structure.
我们报道了在532纳米激光二极管激发下，在图案化蓝宝石衬底（PSS）上合成的甲基溴化铅铵（CH₃NH₃PbBr）钙钛矿薄膜中出现的有趣的连续波准单模随机激光。随着泵浦通量的增加，随机激光发射从典型的多模演变为准单模。在约547.8纳米处，激光峰的半高宽窄至0.06纳米，对应约9000的高品质因数。这种优异的随机激光性能可能归因于532纳米光吸收中的激子共振，以及由于随机散射光通过钙钛矿/ PSS界面的多次反射重新进入钙钛矿晶粒间形成的光学回路的可能性增加而导致的光学共振增强。这项工作通过引入激子共振效应和巧妙设计的周期性纳米/微光学结构，展示了单模钙钛矿随机激光器的前景。
