Ultra-simplified diffraction-based computational spectrometer  

作　　者：Chuangchuang Chen Honggang Gu Shiyuan Liu 

机构地区：[1]State Key Laboratory of Intelligent Manufacturing Equipment and Technology,Huazhong University of Science and Technology,Wuhan,Hubei,430074,China [2]Optics Valley Laboratory,Wuhan,Hubei,430074,China

出　　处：《Light(Science & Applications)》2024年第6期1022-1031,共10页光（科学与应用)（英文版）

基　　金：supported by the National Natural Science Foundation of China(52130504);Key Research and Development Program of Hubei Province(2021BAA013);Innovation Project of Optics Valley Laboratory(OVL2023PY003);Natural Science Foundation of Hubei Province(2021CFB322);Fundamental Research Funds for the Central Universities(2021XXJS113);Guangdong Basic and Applied Basic Research Foundation(2023A1515030149).

摘　　要：Miniaturizing spectrometers for compact and cost-effective mobile platforms is a major challenge in current spectroscopy research,where conventional spectrometers are impractical due to their bulky footprint.Existing miniaturized designs primarily rely on precalibrated response functions of nanophotonic structures to encode spectral information captured in a snapshot by detector arrays.Accurate spectrum reconstruction is achieved through computational techniques,but this requires precise component design,high-precision fabrication,and calibration.We propose an ultra-simplified computational spectrometer that employs a one-to-broadband diffraction decomposition strategy facilitated by a numerical regularized transform that depends only on the spectrum of the diffracted radiation.The key feature of our design is the use of a simple,arbitrarily shaped pinhole as the partial disperser,eliminating the need for complex encoding designs and full spectrum calibration.Our spectrometer achieves a reconstructed spectral peak location accuracy of better than 1 nm over a 200 nm bandwidth and excellent resolution for peaks separated by 3 nm in a bimodal spectrum,all within a compact footprint of under half an inch.Notably,our approach also reveals a breakthrough in broadband coherent diffractive imaging without requiring any prior knowledge of the broadband illumination spectrum,assumptions of non-dispersive specimens,or correction for detector quantum efficiency.

关 键 词：simplified spectrum ILLUMINATION 

分 类 号：O43[机械工程—光学工程] TN2[理学—光学]