Ultracompact computational spectroscopy with a detour-phased planar lens  

作　　者：Wenkai Yang Zijian Wang Jian Xu Dashan Dong Guiyuan Cao Han Lin Baohua Jia Lige Liu 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]Peking University Yangtze Delta Institute of Optoelectronics,Nantong 226010,China [4]Centre for Atomaterials and Nanomanufacturing,School of Science,RMIT University,Melbourne,3000,VIC,Australia

出　　处：《Light(Advanced Manufacturing)》2024年第4期45-53,共9页光(先进制造)(英文)

基　　金：funded by National Key Research and Development Program of China(2022YFF0712500,2022YFC3401100);Guangdong Major Project of Basic and Applied Basic Research No.2020B0301030009;the National Natural Science Foundation of China(12004012,92150301,91750203,12041602,91850111,and 12004013);the China Postdoctoral Science Foundation(2020M680230,2020M680220);The author would like to thank the High-performance Computing Platform of Peking University;This work was also supported by Australia Research Council(Grant No.DP220100603,FT210100806,FT220100559);Industrial Transformation Training Centres scheme(Grant No.IC180100005),Linkage Project scheme(LP210200345).

摘　　要：Compact micro-spectrometers have gained significant attention due to their ease of integration and real-time spectrum measurement capabilities.However,size reduction often compromises performance,particularly in resolution and measurable wavelength range.This work proposes a computational micro-spectrometer based on an ultra-thin(~250 nm)detour-phased graphene oxide planar lens with a sub-millimeter footprint,utilizing a spectral-to-spatial mapping method.The varying intensity pattern along the focal axis of the lens acts as a measurement signal,simplifying the system and enabling real-time spectrum acquisition.Combined with computational retrieval method,an input spectrum is reconstructed with a wavelength interval down to 5 nm,representing a 5-time improvement compared with the result when not using computational method.In an optical compartment of 200μm by 200μm by 450μm from lens profile to the detector surface,the ultracompact spectrometer achieves broad spectrum measurement covering the visible range(420−750 nm)with a wavelength interval of 15 nm.Our compact computational micro-spectrometer paves the way for integration into portable,handheld,and wearable devices,holding promise for diverse real-time applications like in-situ health monitoring(e.g.,tracking blood glucose levels),food quality assessment,and portable counterfeit detection.

关 键 词：Computational spectrometer Planar lens Graphene oxide Direct laser writing 

分 类 号：TN2[电子电信—物理电子学]