2024
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Record 529 of
Title:Depth-Resolved Imaging Through Dynamic Scattering Media Via Speckle Cross-Correlation Under Near-Infrared Illumination
Author Full Names:Wang, Ping(1,2); Zhou, Meiling(2); Zhang, Yang(2,3); Li, Runze(2); Peng, Tong(2); Zhou, Yuan(2,3); Min, Junwei(2); Yao, Cuiping(1); Yao, Baoli(2,3)Source Title:SSRNLanguage:EnglishDocument Type:Preprint (PP)Abstract:Speckle cross-correlation imaging (SCCI) method has the depth-resolved capability, benefiting from the introduction of a reference point. However, the quality of the reconstructed image is severely degraded due to the background noise, which becomes more prominent when imaging through dynamic scattering media. Here, we propose a composite-differential filter-assisted speckle cross-correlation imaging (CDF-SCCI) method, allowing for effectively reducing the background noise of the reconstructed image. The CDF-SCCI method can increase the reconstructed image contrast by a factor of 5. A speckle cross-correlation based imaging system under near-infrared (NIR) illumination is built to enhance the imaging quality further. Quantitative comparison of the reconstructed results through dynamic media with different optical depths reveals the superiority of the NIR illumination over the visible light illumination, extending the maximum optical depth from 7.7 to 10.4. The depth-resolved imaging through various dynamic media, including the SiO2 suspension, milk and anticoagulated pig blood, further demonstrates the potential application of the proposed CDF-SCCI method under NIR illumination in biomedical imaging. ? 2024, The Authors. All rights reserved.Affiliations:(1) Key Laboratory of Biomedical Information Engineering of Ministry of Education, Institute of Biomedical Photonics and Sensing, School of Life Science and Technology, Xi’an Jiaotong University, Shaanxi, Xi’an; 710049, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024DOI Link:10.2139/ssrn.4690404數(shù)據(jù)庫ID（收錄號）:20240035370 -
Record 530 of
Title:A triangular—trapezoidal dual-channel shaping algorithm for resistive anode readout systems and its FPGA implementation
Author Full Names:Zhang, Wen-Wen(1); Song, Yu-Chao(1); Zheng, Jin-Kun(2,3); Yang, Yang(2,4); Bai, Yong-Lin(2,3); La, An-Peng(1); Duan, Jin-Yao(2,3); Zhao, Hua(5); Zhang, Yan-Xin(5); Wang, Fang(5)Source Title:Review of Scientific InstrumentsLanguage:EnglishDocument Type:Journal article (JA)Abstract:This paper introduces a novel digital triangular-trapezoidal double-channel shaping algorithm to enhance the counting rate of resistive anode detectors. The algorithm is based on the trapezoidal shaping algorithm and improves it. At the extreme counting rate, the trapezoidal shaping algorithm cannot alleviate the pulse pileup, so the counting rate cannot meet the requirements of a high performance detector. The triangular-trapezoidal double-channel shaping algorithm is introduced in the resistance anode detector, which can replace the trapezoidal shaping filtering algorithm to process the output signal of the resistance anode detector and obtain the single photon position information. This improvement improves the counting rate of the resistor anode detector and reduces the resolution degradation caused by pulse pileup. The algorithm is simulated by System Generator software and implemented on FPGA (field programmable gate array). The triangular-trapezoidal double-channel shaping algorithm presented in this paper plays an important role in reducing electronic noise and pulse pileup. The algorithm is subjected to simulation testing, and it can recognize signals with a minimum pulse interval of 1 μs and counting rate up to 1000 kcps. ? 2024 Author(s).Affiliations:(1) Xi’an University of Posts and Telecommunications, Xi’an; 710121, China; (2) Key Laboratory of Ultra fast Photoelectric Diagnostic Technology, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences, Xi’an; 710119, China; (3) University of Chinese Academy of Sciences (CAS), Beijing; 100049, China; (4) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (5) Beijing Institute of Tracking and Telecommunication Technology, Beijing; 100049, ChinaPublication Year:2024Volume:95Issue:8Article Number:084708DOI Link:10.1063/5.0202553數(shù)據(jù)庫ID（收錄號）:20243516927816 -
Record 531 of
Title:Generation of arbitrarily structured optical vortex arrays based on the epicycle model
Author Full Names:Yuping, T.A.I.(1,2); Haihao, F.A.N.(1); Xin, M.A.(1); Wenjun, W.E.I.(1); Zhang, Hao(1); Tang, Miaomiao(1); Xinzhong, L.I.(1,2,3)Source Title:Optics ExpressLanguage:EnglishDocument Type:Journal article (JA)Abstract:Optical vortex arrays (OVAs) are complex light fields with versatile structures that have been widely studied in large-capacity optical communications, optical tweezers, and optical measurements. However, generating OVAs with arbitrary structures without explicit analytical expressions remains a challenge. To address this issue, we propose an alternative scheme for customizing OVAs with arbitrary structures using an epicycle model and vortex localization techniques. This method can accurately generate an OVA with an arbitrary structure by predesigning the positions of each vortex. The influence of the number and coordinates of the locating points on customized OVAs is discussed. Finally, the structures of the OVA and each vortex are individually shaped into specifically formed fractal shapes by combining cross-phase techniques. This unique OVA will open up novel potential applications, such as the complex manipulation of multiparticle systems and optical communication based on optical angular momentum. ? 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.Affiliations:(1) School of Chemistry and Chemical Engineering, School of Physics and Engineering, Henan University of Science and Technology, Luoyang; 471023, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (3) Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, Luoyang; 471023, ChinaPublication Year:2024Volume:32Issue:6Start Page:10577-10586DOI Link:10.1364/OE.521250數(shù)據(jù)庫ID（收錄號）:20241215766416