Wide-angle photon collection in deep-ultraviolet photodetectors via metalens integration
Abstract
The authors demonstrate a compact and monolithically integrated strategy to enhance wide-angle light collection in deep-ultraviolet photodetectors operating at 265 nm by incorporating an Si3N4 metalens directly onto the sapphire optical window. The design addresses angular limitations of conventional packaging and achieves a 93× enhancement in photocurrent response at ±60° incidence. A single-angle phase profile is employed to simplify metalens fabrication while maintaining effective focusing over a 160° angular range. Finite-difference time-domain simulations confirm the experimental trends in angle-resolved power collection. The approach eliminates bulky optical components and offers a scalable path toward angularly adaptive and high-sensitivity UV photodetectors. Potential applications include fire detection, power grid monitoring, and secure UV communications.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (9)
Jianhong Zhang
Wenxin Li
Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, Key Laboratory for Ultrafine Materials of Ministry of Education, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Engineering Research Center for Biomedical Materials of Ministry of Education, School of Materials Science and Engineering
Jiandong Ye
School of Electronic Science and Engineering, Nanjing University 2 , Nanjing 210023,
Weizong Xu
School of Electronic Science and Engineering, Jiangsu Key Laboratory of Advanced Semiconductors and High Energy Efficiency Devices, and Key Laboratory of Optoelectronic Devices and Systems with Extreme Performances of MOE, Nanjing University 1 , Nanjing 210023,
Dong Zhou
Feng Zhou
Rong Zhang
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong 999077, China
Hai Lu
Fang-fang Ren
School of Electronic Science and Engineering, Nanjing University 2 , Nanjing 210023,