期刊
ACS NANO
卷 13, 期 9, 页码 10653-10661出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b04925
关键词
random laser; perovskite; vertical cavity surface-emitting laser; speckle free imaging; spatial coherence
类别
资金
- National Natural Science Foundation of China [2018YFB2200400]
- Shenzhen Fundamental research projects [JCYJ20180507183532343]
Random lasers have been ideal illumination sources for speckle-free and high-speed imaging. Despite their successes, the real applications of random lasers are facing a long-standing challenge, i.e., the cumbersome size of the illuminating system. Herein, we demonstrate perovskite-based surface emitting random lasers (SERLs) and explore their applications in speckle-free imaging. The random lasers are generated by multiple scattering in a perovskite polycrystalline film sandwiched by two distributed Bragg reflectors. Owing to the tight confinement in vertical direction and large number of random resonances, the wavevectors of random lasers are dominated by their vertical components, and thus, multimode SERLs with a divergence angle of similar to 3-5 degrees and low spatial coherence are produced. By directly illuminating the patterns with the SERLs, the notable speckle noises of conventional optical images have been dramatically suppressed. This research shall provide a strategy toward the integrated spectral-free imaging systems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据