Journal
ACS NANO
Volume 13, Issue 9, Pages 10653-10661Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b04925
Keywords
random laser; perovskite; vertical cavity surface-emitting laser; speckle free imaging; spatial coherence
Categories
Funding
- National Natural Science Foundation of China [2018YFB2200400]
- Shenzhen Fundamental research projects [JCYJ20180507183532343]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available