Detour-phased perovskite ultrathin planar lens using direct femtosecond laser writing  

作　　者：WENKAI YANG LIGE LIU DASHAN DONG XIN ZHANG HAN LIN YUNKUN WANG HONG YANG YUNAN GAO HAIZHENG ZHONG BAOHUA JIA KEBIN SHI 

机构地区：[1]State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics,School of Physics,Peking University,Beijing 100871,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China [3]MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices,School of Materials Sciences and Engineering,Beijing Institute of Technology,Beijing 100081,China [4]School of Science,RMIT University,Melbourne 3000,VIC,Australia [5]Peking University Yangtze Delta Institute of Optoelectronics,Nantong 226010,China

出　　处：《Photonics Research》2022年第12期2768-2777,共10页光子学研究（英文版）

基　　金：Guangdong Major Project of Basic and Applied Basic Research(2020B0301030009);National Natural Science Foundation of China(12004012,12004013,12041602,91750203,91850111,92150301);China Postdoctoral Science Foundation(2020M680220,2020M680230);National Key Research and Development Program of China(2018YFA0306302)。

摘　　要：Perovskite-enabled optical devices have drawn intensive interest and have been considered promising candidates for integrated optoelectronic systems.As one of the important photonic functions,optical phase modulation previously was demonstrated with perovskite substrate and complex refractive index engineering with laser scribing.Here we report on the new scheme of achieving efficient phase modulation by combining detour phase design with 40 nm ultrathin perovskite films composed of nanosized crystalline particles.Phase modulation was realized by binary amplitude patterning,which significantly simplifies the fabrication process.Perovskite nanocrystal films exhibit significantly weak ion migration effects under femtosecond laser writing,resulting in smooth edges along the laser ablated area and high diffractive optical quality.Fabrication of a detour-phased perovskite ultrathin planar lens with a diameter of 150μm using femtosecond laser scribing was experimentally demonstrated.A high-performance 3D focus was observed,and the fabrication showed a high tolerance with different laser writing powers.Furthermore,the high-quality imaging capability of perovskite ultrathin planar lenses with a suppressed background was also demonstrated.

关 键 词：laser ULTRATHIN FEMTOSECOND 

分 类 号：TH74[机械工程—光学工程]