2021/01/08 by Jad Salman, Mahesh K. Gangishetty, Bryan E. Rubio-Perez +8 · 2 voices
Engineering · Physics and Astronomy · #Perovskite Materials and Applications #Photorefractive and Nonlinear Optics #Random lasers and scattering media #physics.app-ph #physics.optics
paper · pdf · doi:10.1088/2040-8986/abf171
arxiv published 2021/01/08 · arxiv updated 2021/02/20 · openalex publication_date 2021/03/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We demonstrate a passive down-conversion imaging system that converts broadband ultraviolet light to narrow-band green light while preserving the directionality of rays, and thus enabling direct down-conversion imaging. At the same time our system has high transparency in the visible, enabling superimposed visible and ultraviolet imaging. The frequency conversion is performed by a subwavelength-thickness transparent downconverter based on highly efficient CsPbBr3 nanocrystals incorporated into the focal plane of a simple telescope or relay-lens geometry. The resulting imaging performance of this down-conversion system approaches the diffraction limit. This demonstration sets the stage for the incorporation of other high-efficiency perovskite nanocrystal materials to enable passive multi-frequency conversion imaging systems.