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Enhancing spatiotemporal focusing of light deep inside scattering media with Time-Gated Reflection Matrix

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Light(Science & Applications) 2022年第7期11卷 1320-1321页

作者： Zhipeng Yu Huanhao Li tianting Zhong Puxiang lai Department of Biomedical Engineering The Hong Kong Polytechnic UniversityHong Kong SARChina Shenzhen Research Institute The Hong Kong Polytechnic UniversityShenzhenChina Photonics Research Institute The Hong Kong Polytechnic UniversityHong Kong SAR.China

Time-gated reflection matrix(RM)has been successfully used for optical imaging deep inside Scattering ***,this method was extended to enhance the spatiotemporal focusing of light ultra-deep inside scattering *** is achieved by calibrating the decomposition of the RM with the Tikhonov regularization parameter to convert mutiply scattered photons that share the same time of flight with the singly scattered photons into singly scattered *** a capability suggests a reshaping to the interaction mechanism between light and scattering media,which may beneft or inspire wide optical applications that desire enhanced spatiotemporal focusing of light at depths inside scattering media.

关键词： scattered media light

Active wavefront shaping for controlling and improving multimode fi ber sensor

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Journal of Innovative Optical Health Sciences 2019年第4期12卷 127-135页

作者： tianting Zhong Zhipeng Yu Huanhao Li Zihao Li Haohong Li Puxiang lai Department of Biomedical Engineering Hong Kong Polytechnic University Hong Kong P.R.China Shenzhen Research Institute Hong Kong Polytechnic University Shenzhen 518057 P.R.China Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan Hubei 430074P.R.China

Wavefront shaping(WFS)techniques have been used as a powerful tool to control light propagation in complex media,including multimode *** this paper,we propose a new application of WFS for multimode fber-based *** use of a single multimode fiber alone,without any special fabrication,as a sensor based on the light intensity variations is not an easy *** twist effect on multimode fiber is used as an example *** results show that light intensity through the multimode fiber shows no direct relationship with the twist angle,but the correlation coefficient(CC)of speckle patterns ***,if WFS is applied to transform the spatially seemingly random light pattern at the exit of the multimode fiber into an optical *** focal pattern correlation and intensity both can serve to gauge the twist angle,with doubled measurement range and allowance of using a fast point detector to provide the *** further development,WFS may find potentials to facilitate the development of multimode fber-based sensors in a variety of scenarios.

关键词： Multimode fiber wavefront shaping scattering media fiber sensor optical focusing

Accelerating deep learning with high energy efficiency:From microchip to physical systems

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The Innovation 2022年第4期3卷 9-10页

作者： Huanhao Li Zhipeng Yu Qi Zhao tianting Zhong Puxiang lai Department of Biomedical Engineering Hong Kong Polytechnic UniversityHong KongChina Shenzhen Research Institute Hong Kong Polytechnic UniversityShenzhen 518057China Photonics Research Institute Hong Kong Polytechnic UniversityHong KongChina

In the era of digits and intemet,massive data have been continuously gener-ated from a variety of sources,including video,photo,audio,text,intemet of things,*** is intuitive that more accurate pattems can be obtained by feeding more data for effective analysis;despite the data redundancy,a clearer picture can be delineated for better ***,traditional methods,even in machine learning,do not benefit from the expanding amount of data,whose perfomance nearty saturates when the data collection is large enough(Figure 1A).Such a dilemma emerges due to their limited capability and insuff cient supply of computation power in the past.

关键词： Figure intuitive enough

Towards ideal focusing of diffused light via optical wavefront shaping

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Advanced Photonics 2023年第2期5卷 3-5页

作者： Huanhao Li Zhipeng Yu tianting Zhong Shengfu Cheng Puxiang lai Hong Kong Polytechnic University Department of Biomedical EngineeringHong KongChina Hong Kong Polytechnic University Shenzhen Research InstituteShenzhenChina Hong Kong Polytechnic University Photonics Research InstituteHong KongChina

Multiple scattering can significantly scramble the amplitude and phase profile of an optical *** obscures subtle observations but only speckle patterns can be seen,unlike the ballistic regime where the information or the optical field can be identified with limited *** optical manipulation including information transmission and precise focusing is therefore obstructed as light travels deep into turbidmedia such as fog,turbid fluids,and biological tissues.

关键词： field precise speckle

Adaptive optical focusing through perturbed scattering media with a dynamic mutation algorithm

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Photonics Research 2021年第2期9卷 202-212页

作者： HUANHAO LI CHI MAN WOO tianting ZHONG ZHIPENG YU YUNQI LUO YUANJIN ZHENG XIN YANG HUI HUI PUXIANG lai Department of Biomedical Engineering The Hong Kong Polytechnic University The Hong Kong Polytechnic University Shenzhen Research Institute School of Electrical and Electronics Engineering Nanyang Technological University CAS Key Laboratory of Molecular Imaging Institute of AutomationChinese Academy of Sciences

Optical imaging through or inside scattering media, such as multimode fiber and biological tissues, has a significant impact in biomedicine yet is considered challenging due to the strong scattering nature of light. In the past decade, promising progress has been made in the field, largely benefiting from the invention of iterative optical wavefront shaping, with which deep-tissue high-resolution optical focusing and hence imaging becomes possible. Most of the reported iterative algorithms can overcome small perturbations on the noise level but fail to effectively adapt beyond the noise level, e.g., sudden strong perturbations. Reoptimizations are usually needed for significant decorrelation to the medium since these algorithms heavily rely on the optimization performance in the previous iterations. Such ineffectiveness is probably due to the absence of a metric that can gauge the deviation of the instant wavefront from the optimum compensation based on the concurrently measured optical *** this study, a square rule of binary-amplitude modulation, directly relating the measured focusing performance with the error in the optimized wavefront, is theoretically proved and experimentally validated. With this simple rule, it is feasible to quantify how many pixels on the spatial light modulator incorrectly modulate the wavefront for the instant status of the medium or the whole system. As an example of application, we propose a novel algorithm, the dynamic mutation algorithm, which has high adaptability against perturbations by probing how far the optimization has gone toward the theoretically optimal performance. The diminished focus of scattered light can be effectively recovered when perturbations to the medium cause a significant drop in the focusing performance, which no existing algorithms can achieve due to their inherent strong dependence on previous optimizations. With further improvement, the square rule and the new algorithm may boost or inspire many ap

关键词： scattering modulator algorithm

Long distance all-optical logic operations through a single multimode fiber empowered by wavefront shaping

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Photonics Research 2024年第3期12卷 587-597页

作者： ZHIPENG YU tianting ZHONG HUANHAO LI HAORAN LI CHI MAN WOO SHENGFU CHENG SHUMING JIAO HONGLIN LIU CHAO LU PUXIANG lai Department of Biomedical Engineering The Hong Kong Polytechnic UniversityHong Kong SARChina Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518000China Peng Cheng Laboratory Shenzhen 518055China Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Department of Electronic and Information Engineering The Hong Kong Polytechnic UniversityHong Kong SARChina Photonics Research Institute The Hong Kong Polytechnic UniversityHong Kong SARChina

Multimode fibers(MMFs)are a promising solution for high-throughput signal transmission in the time ***,crosstalk among different optical modes within the MMF scrambles input information and creates seemingly random speckle patterns at the *** characterize this process,a transmission matrix(TM)can be used to relate input and output *** innovations use TMs to manipulate the output field by shaping the input wavefront for exciting advances in deep-brain imaging,neuron stimulation,quantum networks,and analog ***,these approaches consider input/output segments as independent,limiting their use for separate signal processing,such as logic *** proposed method,which makes input/output segments as interdependent,adjusts the phase of corresponding output fields using phase bias maps superimposed on input *** superposition enables signal logic operations through a 15-m-long *** experiments,a single optical logic gate containing three basic logic functions and cascading multiple logic gates to handle binary operands is *** operations are performed for multi-bit logic operations,and multiple optical logic gates are reconstructed simultaneously in a single logic gate with polarization *** proposed method may open new avenues for long-range logic signal processing and transmission via MMFs.

关键词： optical polarization fiber

Learning-based super-resolution interpolation for sub-Nyquist sampled laser speckles

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Photonics Research 2023年第4期11卷 631-642页

作者： HUANHAO LI ZHIPENG YU QI ZHAO YUNQI LUO SHENGFU CHENG tianting ZHONG CHI MAN WOO HONGLIN LIU LIHONG V.WANG YUANJIN ZHENG PUXIANG lai Department of Biomedical Engineering Hong Kong Polytechnic UniversityHong KongChina Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518063China School of Electrical and Electronics Engineering Nanyang Technological UniversitySingapore 639798Singapore Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Caltech Optical Imaging Laboratory Andrew and Peggy Cherng Department of Medical EngineeringCalifornia Institute of TechnologyPasadenaCalifornia 91125USA Photonics Research Institute Hong Kong Polytechnic UniversityHong KongChina

Information retrieval from visually random optical speckle patterns is desired in many scenarios yet considered *** requires accurate understanding or mapping of the multiple scattering process,or reliable capability to reverse or compensate for the scattering-induced phase *** whatever situation,effective resolving and digitization of speckle patterns are ***,on some occasions,to increase the acquisition speed and/or signal-to-noise ratio(SNR),speckles captured by cameras are inevitably sampled in the sub-Nyquist domain via pixel binning(one camera pixel contains multiple speckle grains)due to finite size or limited bandwidth of *** a down-sampling process is irreversible;it undermines the fine structures of speckle grains and hence the encoded information,preventing successful information *** retrace the lost information,super-resolution interpolation for such sub-Nyquist sampled speckles is *** this work,a deep neural network,namely SpkSRNet,is proposed to effectively up sample speckles that are sampled below 1/10 of the Nyquist criterion to well-resolved ones that not only resemble the comprehensive morphology of original speckles(decompose multiple speckle grains from one camera pixel)but also recover the lost complex information(human face in this study)with high fidelity under normal-and low-light conditions,which is impossible with classic interpolation *** successful speckle super-resolution interpolation demonstrations are essentially enabled by the strong implicit correlation among speckle grains,which is non-quantifiable but could be discovered by the well-trained *** further engineering,the proposed learning platform may benefit many scenarios that are physically inaccessible,enabling fast acquisition of speckles with sufficient SNR and opening up new avenues for seeing big and seeing clearly simultaneously in complex scenarios.

关键词： speckle interpolation hence

Wavefront shaping: A versatile tool to conquer multiple scattering in multidisciplinary fields

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The Innovation 2022年第5期3卷 80-94页

作者： Zhipeng Yu Huanhao Li tianting Zhong Jung-Hoon Park Shengfu Cheng Chi Man Woo Qi Zhao Jing Yao Yingying Zhou Xiazi Huang Weiran Pang Hansol Yoon Yuecheng Shen Honglin Liu Yuanjin Zheng YongKeun Park Lihong V.Wang Puxiang lai Department of Biomedical Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518052China Department of Biomedical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Tomocube Daejeon 34109Republic of Korea Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang Avenue201800 SingaporeSingapore Department of Physics Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea KAIST Institute for Health Science and Technology KAISTDaejeon 34141Republic of Korea Department of Medical Engineering California Institute of TechnologyPasadenaCA 91125USA Department of Electrical Engineering California Institute of TechnologyPasadenaCA 91125USA Photonics Research Institute The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong 999077China

Optical techniques offer a wide variety of applications as light-matter interactions provide extremely sensitive mechanisms to probe or treat target *** of these implementations rely on the usage of ballistic or quasi-ballistic photons to achieve high spatial ***,the inherent scattering nature of light in biological tissues or tissue-like scattering media constitutes a critical obstacle that has restricted the penetration depth of non-scattered photons and hence limited the implementation of most optical techniques for wider *** addition,the components of an optical system are usually designed and manufactured for a fixed function or *** advances in wavefront shaping have demonstrated that scattering-or component-induced phase distortions can be compensated by optimizing the wavefront of the input light pattern through iteration or by conjugating the transmission matrix of the scattering medium.

关键词： versatile hence iteration

基于相干光调控的无透镜光纤成像及其应用(特邀)

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激光与光电子学进展 2024年第6期61卷 25-53页

作者：程圣福仲天庭胡子敏李浩然赖溥祥香港理工大学生物医学工程学系中国香港香港理工大学光子技术研究院中国香港香港理工大学深圳研究院广东深圳518063

基于多模光纤或多芯光纤的无透镜超细光纤内窥成像技术近些年获得了快速发展,有望成为下一代的极微创、高分辨率内窥显微镜。通过对相干入射光场的时空调控,该技术可克服多模光纤中模式色散或多芯光纤中相位畸变的影响,在无需光纤末端... 详细信息

基于多模光纤或多芯光纤的无透镜超细光纤内窥成像技术近些年获得了快速发展,有望成为下一代的极微创、高分辨率内窥显微镜。通过对相干入射光场的时空调控,该技术可克服多模光纤中模式色散或多芯光纤中相位畸变的影响,在无需光纤末端透镜或扫描器件的情况下实现高分辨率的聚焦、成像及相关应用。此外,在无透镜光纤内窥成像或图像传输等场景下,通过构建物理或深度学习模型,从光纤输出测量中也能实现物体信息重建。对相干光纤无透镜成像技术的发展进行综述,首先说明无透镜光纤成像的基础原理,并从主动波前调控和被动目标重建这两类角度阐述无透镜光纤成像方法,接着介绍一些先进光纤成像模态和技术,列举光纤成像相关应用,最后分析该领域所面临的挑战,总结并展望其进一步发展方向和应用前景。

关键词：多模光纤多芯光纤波前整形内窥成像光学显微成像深度学习