Robust spectral reconstruction algorithm enables quantum dot spectrometers with subnanometer spectral accuracy  

作　　者：Wenkai Ma Qian Xue Yang Yang Hanqiu Zhang Daoli Zhang Xinzheng Lan Liang Gao Jianbing Zhang Jiang Tang 

机构地区：[1]Huazhong University of Science and Technology,School of Integrated Circuits,Wuhan,China [2]Huazhong University of Science and Technology,School of Optical and Electronic Information,Wuhan,China [3]Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics,Wuhan,China [4]Huazhong University of Science and Technology,Wenzhou Advanced Manufacturing Technology Research Institute,Wenzhou,China [5]Optics Valley Laboratory,Wuhan,China [6]Research Institute of Huazhong University of Science and Technology in Shenzhen,Shenzhen,China

出　　处：《Advanced Photonics Nexus》2024年第4期101-109,共9页先进光子学通讯（英文）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2021YFA0715502);the National Natural Science Foundation of China(Grant Nos.61974052,U22A2083,62204091,62374068,and 62304085);the Scientific Research Project of Wenzhou(Grant No.G2023025);the Innovation Project of Optics Valley Laboratory(Grant No.OVL2023ZD002);the Exploration Project of Natural Science Foundation of Zhejiang Province(Grant No.LY23F040005);the Fund from Science,Technology,and Innovation Commission of Shenzhen Municipality(Grant Nos.GJHZ20210705142540010 and GJHZ20220913143403007).

摘　　要：Since the concept of computational spectroscopy was introduced,numerous computational spectrometers have emerged.While most of the work focuses on materials,optical structures,and devices,little attention is paid to the reconstruction algorithm,thus resulting in a common issue:the effectiveness of spectral reconstruction is limited under high-level noise originating from the data acquisition process.Here,we fabricate a computational spectrometer based on a quantum dot(QD)filter array and propose what we believe is a novel algorithm,TKVA(algorithm with Tikhonov and total variation regularization,and the alternating direction method of multipliers),to suppress the impact of noise on spectral recovery.Surprisingly,the new TKVA algorithm gives rise to another advantage,i.e.,the spectral accuracy can be enhanced through interpolation of the precalibration data,providing a convenient solution for performance improvement.In addition,the accuracy of spectral recovery is also enhanced via the interpolation,highlighting its superiority in spectral reconstruction.As a result,the QD spectrometer using the TKVA algorithm shows supreme spectral recovery accuracy compared to the traditional algorithms for complex and broad spectra,a spectral accuracy as low as 0.1 nm,and a spectral resolution of 2 nm in the range of 400 to 800 nm.The new reconstruction algorithm can be applied in various computational spectrometers,facilitating the development of this kind of equipment.

关 键 词：microspectrometer quantum dots REGULARIZATION compressive sensing 

分 类 号：O17[理学—数学]