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1st Advanced imaging and Information Processing Conference, AIIP 2023

作者： Xie, Zhenfei Yu, Xuelian Wang, Zhengxian Li, Heng Heilongjiang Provincial Key Laboratory of Quantum Control School of Measurement and Communication Engineering Harbin University of Science and Technology Harbin150080 China Shenzhen Engineering Laboratory of Aerospace Detection and Imaging College of Electronic and Information Engineering Harbin Institute of Technology Shenzhen518055 China

ISBN: (纸本)9781510671904

Phase retrieval algorithms, such as the Wirtinger Flow (WF) algorithm, are widely used in various fields. As a non-convex optimization algorithm for phase retrieval, WF is commonly employed in the reconstruction of holograms in holographic image projection. These types of algorithms typically involve two stages: an initialization stage and an iterative optimization stage. In the initialization stage, an initial value is provided, and a spectral method is used to calculate an approximate solution as the initial guess. The iterative optimization stage then utilizes the Wirtinger gradient to iteratively compute and converge the initial guess to a nearby real solution, thereby obtaining the global optimal solution. However, due to the random nature of the initial values, the computed results often exhibit significant instability. To address this issue, this paper proposes an approach based on a quadratic distribution for improving the stability of the results. In the initialization stage, the initial value is set as the quadratic distribution initial value. Then, the spectral method is applied again to calculate the initial guess. Since the quadratic distribution initial value is artificially assigned, it enhances the stability of the computed results. To validate this method, the paper applies the quadratic distribution initial value to both the initialization stage of the WF algorithm and the Truncated Amplitude Flow (TAF) algorithm. A comparison is made between the results obtained using random initial value and those obtained using the quadratic distribution initial values. The results demonstrate that compared to random initial values, the quadratic distribution initial values can achieve faster and equally accurate computation results with higher stability. Finally, this method is applied to simulation experiments of in-line digital holography, and the reconstruction results from the experiments further confirm the effectiveness of our approach. © 2023 SPIE.

关键词： Convex optimization

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Synthetic Weyl points in plasmonic chain with simultaneous inversion and reflection symmetry breaking

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Physical Review B 2024年第7期110卷 075420-075420页

作者： Huizhou Wu Z. Z. Liu Jun-Jun Xiao College of Electronic and Information Engineering and Shenzhen Engineering Laboratory of Aerospace Detection and Imaging Research Center for Advanced Optics and Photoelectronics Department of Physics College of Science College of Integrated Circuit

Photonic nanoparticle arrays present a unique platform for exploring optical topological phenomena. In this study, we incorporate the concept of synthetic dimensions into the plasmonic system, which allows us to investigate Weyl physics within a chain of metallic nanoparticles. By introducing two extra periodic positional parameters into the chain, we construct a synthetic three-dimensional space that gives rise to synthetic Weyl points (WPs). Our findings reveal that the chain maintains topologically protected edge modes even when the inversion symmetry of the chain is broken. The topological properties of these edge modes are intrinsically linked to the WPs within the synthetic three-dimensional space. However, degenerate edge modes emerge exclusively in chains possessing inversion symmetry. Furthermore, we uncover the bulk-edge correspondence in the chains, yielding a deeper understanding of the topological nature of edge modes in systems without symmetry. Our research not only clarifies the topological origin of a class of edge states within asymmetric nanoparticle chains but also provides perspectives for realizing higher-dimensional topological effects in nanoparticle arrays.

关键词： Topological effects in photonic systems Nanoparticles Weyl semimetal Discrete dipole approximation

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Coexisting valley and pseudo-spin topological edge states in photonic topological insulators made of distorted Kekule lattices

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Photonics Research 2022年第4期10卷 999-1010页

作者： Guochao Wei Zhenzhen Liu Licheng Wang Jianyuan Song Jun-Jun Xiao Shenzhen Engineering Laboratory of Aerospace Detection and Imaging College of Electronic and Information EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China Shenzhen Suntak Multilayer PCB Co. Ltd.Shenzhen 518115China

Photonic topological insulators protected by the lattice spatial symmetry(e.g., inversion and rotation symmetry)mainly support single type edge state, interpreted by either valley or pseudo-spin. Here, we demonstrate theoretically, numerically, and experimentally that a type of judiciously designed two-dimensional Kekulé photonic crystal with time reversal symmetry can possess topological valley and pseudo-spin edge states in different frequency bands. Topologically robust transportation of both the valley and pseudo-spin edge states was confirmed by measuring the transmission of straight and z-shaped interface supported edge mode and comparing with bulk modes in the microwave frequency regime. In addition, we show that due to the distinct topological origins, valley and pseudo-spin edge states can be distinguished by examining their end-scattering into the free space. Our system provides an alternative way in manipulating electromagnetic waves with additional degree-of-freedom, which has potential applications for robust and high-capacity waveguiding and multi-mode dividing.

关键词： topological symmetry insulator

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Geometric anisotropy induced higher-order topological insulators in nonsymmorphic photonic crystals

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Physical Review B 2022年第8期106卷 085415-085415页

作者： Zhenzhen Liu Guochao Wei Jun-Jun Xiao Shenzhen Engineering Laboratory of Aerospace Detection and Imaging College of Electronic and Information Engineering Harbin Institute of Technology (Shenzhen) Shenzhen 518055 China

To a significant extent, the rich physical properties of photonic crystals (PCs) are determined by the underlying geometry, in which the composed symmetry operator and their combinations contribute to their unique topological invariant to characterize the topological phases. In this work, we use geometric anisotropy in the 2D square lattice composed of four rectangle blocks. Due to the presence of glide symmetry, we show a variety of topological phase transitions in designed nonsymmorphic PCs and these transitions shall be understood in terms of the Zak phase and Chern number in synthetic space, as well as the pseudospin-2 concept, combinationally. Furthermore, Zak phase winding in the periodic synthetic parameter space yields high-order Chern number and double interface states. In terms of the extended Zak phase and pseudospin Hall effect, a higher-order topological insulator is constructed in the PC system. Based on the combination of different lattices, this represents a unique system that requires multiple topological concepts and indices for theoretical examination and understanding. The intriguing and abundant topological features are also sustained in the corresponding three-dimensional PC slab, which makes it a very interesting platform to control the flow of optical signals.

关键词： Photonic crystals Topological effects in photonic systems Topological insulators

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Remodel the perifollicular microenvironment via Minoxidil-loaded microneedle patch and cold atmospheric plasma for treating androgenetic alopecia

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Nano Research 2024年第7期17卷 6411-6419页

作者： Hao Chen Xianzhe Tang Yueye Huang Chen Chen Yuheng Yang Chaojie Hao Wenqi Xie Tingjing Huang Xiaofeng Cheng Qingnan Xu Shicong Huang Zhi Ye Xucong Lin Zhaowei Chen Zhitong Chen MOE Key Laboratory for Analytical Science of Food Safety and Biology and New Cornerstone Science LaboratoryCollege of ChemistryFuzhou UniversityFuzhou 350108China Institute of Biomedical and Health Engineering Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Advanced Therapeutic Center National Innovation Center for Advanced Medical DevicesShenzhen 518000China Department of Chemistry University College LondonLondon WC1H 0AJUK Engineering Technology Research Center on Reagent and Instrument for Rapid Detection of Product Quality and Food Safety in Fujian Province College of ChemistryFuzhou UniversityFuzhou 350108China Key Laboratory of Biomedical Imaging Science and System Chinese Academy of SciencesShenzhen 518055China

Androgenetic alopecia(AGA)is a chronic and progressive form of hair loss characterized by vascular degeneration in the perifollicular microenvironment,leading to cell apoptosis and eventual loss of hair follicles(HFs).Traditional therapeutic formulations,such as Minoxidil(MXD)tincture,have limitations in reshaping the perifollicular microenvironment and exhibit limited ***,we report a multi-synergistic therapeutic platform for high-performance hair regeneration *** platform combines microneedle(MN)patches loaded with MXD-encapsulated nanostructured lipid carriers(MXD-NLC-MNs)and cold atmospheric plasma(CAP).The MNs’mechanical strength enables efficient transdermal delivery of MXD to the targeted dermal papilla cells,promoting cell ***,in collaboration with MXD,the mechanical stimulation exerted by MN application synergistically upregulates the expression of vascular endothelial growth factor,leading to ***,the transient microchannels in the skin created by MNs facilitate the transdermal delivery of CAPgenerated nitric oxide(NO)to the sites of HF lesions,whereby the synergistic interaction between MXD and NO boosts perifollicular ***,the perifollicular microenvironment can be effectively reshaped to accelerate hair regeneration in AGA murine *** multi-synergistic combination therapy strategy would hold great promise for effectively treating AGA and promoting hair regrowth.

关键词： nanomedicine androgenetic alopecia microneedle cold atmospheric plasma drug delivery

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Grouping bi-chi-squared method for pulsar navigation experiment using observations of Rossi X-ray timing explorer

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Chinese Journal of Aeronautics 2023年第1期36卷 386-395页

作者： Haifeng SUN Jianyu SU Zhongwen DENG Lirong SHEN Weimin BAO Xiaoping LI Liansheng LI Zhe SU Wencong WANG School of Aerospace Science and Technology Xidian UniversityXi’an 710126China Shaanxi Key Laboratory of Space Extreme Detection Xi’an 710126China Peng Cheng Laboratory Shenzhen 518000China Academy of Advanced Interdisciplinary Research Xidian UniversityXi’an 710126China Beijing Institute of Control Engineering Beijing 100190China Institute of Space Electronic Information Technology Xi’an 710100China Shandong Institute of Aerospace Electronic Technology Yantai 264032China

X-ray pulsar-based navigation is a revolutionary technology which is capable of providing the required navigation information in the solar system. Performing as an important pulsar-based navigation technique, the Significance Enhancement of Pulse-profile with Orbit-dynamics(SEPO)can estimate orbital elements by using the distortion of pulse profile. Based on the SEPO technique,we propose a grouping bi-chi-squared technique and adopt the observations of Rossi X-ray Timing Explorer(RXTE) to carry out experimental verification. The pulsar timing is refined to determine spin parameters of the Crab pulsar(PSR B0531+21) during the observation periods, and a short-term dynamic model for RXTE satellite is established by considering the effects of diverse *** results suggest that the position and velocity errors are 16.3 km(3σ) and 13.3 m/s(3σ) with two adjacent observations split by one day(exposure time of 1.5 ks), outperforming those of the POLAR experiment whose results are 19.2 km(3σ) and 432 m/s(3σ). The approach provided is particularly applicable to the estimation of orbital elements via using high-flux observations.

关键词： Model buildings Navigation analysis Navigation testing Pulsars RXTE observations

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Manipulating the topological phase of coupled modes in a plasmonic array via engineering near-field asymmetry: From zigzag arrangement to dielectric substrate

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Physical Review B 2024年第8期110卷 085407-085407页

作者： Huizhou Wu Z. Z. Liu G. C. Wei Q. Zhang Jun-Jun Xiao College of Electronic and Information Engineering and Shenzhen Engineering Laboratory of Aerospace Detection and Imaging Research Center for Advanced Optics and Photoelectronics Department of Physics College of Science School of Mathematical and Physical Sciences Department of Physics and Optoelectronics College of Integrated Circuit

Photonic nanoparticle arrays that exhibit topologically nontrivial phases are often established by arranging nanoparticles in a lattice configuration in analog to the Su-Schrieffer-Heeger model. This design strategy is based on the principle that the optical interactions among the nanoparticles are predominantly dictated by the distances between them. However, these interactions are also significantly shaped by the near-field profiles of the nanoparticles. As an exemplary case, we examine a zigzag array of metallic ellipsoidal nanoparticles (ENPs) and illustrate how the topological phase of coupled plasmonic waves in such an array can be manipulated by controlling the orientation of the ENPs. More intriguingly, the near-field characteristics of the ENPs can be fine-tuned by the presence of a substrate, suggesting an alternative avenue for modulating the inter-particle interactions. We further show that topological phase transitions in both one-dimensional (1D) and 2D ENP arrays can be triggered by introducing a nearby dielectric substrate, while maintaining the original lattice structure unchanged. Our findings reveal a different mechanism for modulating the topological phases of nanoparticle arrays and provide a strategy that could be extrapolated to other photonic and classical wave systems, suggesting possibilities for the design and control of topological states in carefully engineered photonic systems.

关键词： Plasmonics Topological effects in photonic systems Nanoparticles Discrete dipole approximation

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Non-contact optical dynamic measurements at different ranges:a review

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Acta Mechanica Sinica 2021年第4期37卷 537-553,I0001页

作者： Yu Fu Yang Shang Wenxin Hu Bin Li Qifeng Yu Shenzhen Key Laboratory of Intelligent Optical Measurement and Detection Shenzhen UniversityShenzhen 518060China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

Optical dynamic measurements are widely used for non-contact vibration,continuous deformation,or moving *** measurement techniques were developed for different deformation *** paper reviews three types of technique for different measurement ranges:interferometric techniques for deformation or vibration(nanometer to submillimeter amplitude)whose measurement accuracies rely on phase extraction of interferometric signal;imaging based techniques for deformation or vibration(micrometer to centimeter amplitude)with the aid of moire,structured light,and man-made speckles,whose sensitivities is from 1/100 to 1/10 pixel;and videometrics for large deformation or movement detection(greater than centimeter amplitude).Many research groups have improved measurement capabilities for these three techniques to meet particular industrial application requirements.

关键词： Vibration measurement Laser interferometry Digital image correlation High-speed imaging Videometrics

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Welding depth measurement for different mode lasers using optical coherence tomography

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Chinese Optics Letters 2024年第1期22卷 41-46页

作者：谢冠明王三宏张跃强李由胡彪傅愉于起峰 Institute of Intelligent Optical Measurement and Detection Shenzhen UniversityShenzhen 518060China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Shenzhen Sincevision Technology Co. Ltd.Shenzhen 518055China National Key Laboratory of Human Factors Engineering China Astronaut Research and Training CenterBeijing 100094China College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China

Optical coherence tomography(OCT)allows a direct and precise measurement of laser welding depth by coaxially measuring the keyhole depth and can be used for process monitoring and *** OCT measurement was taken during single-beam laser welding,the keyhole instability of aluminum welding resulted in highly scattered OCT data and complicated the welding depth extraction *** a combination of an inner core beam and an outer ring beam,a novel adjustable ring mode(ARM)laser for producing a stable keyhole was applied to the OCT *** ARM laser power arrangements were conducted on aluminum and *** results indicated that the ring beam greatly improved the stability of the core beam-induced keyhole,and smooth welding depth can be extracted from the concentrated OCT data.

关键词： optical coherence tomography adjustable ring mode laser laser welding welding depth

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Z3-classified topological phases in plasmonic nanoparticle arrays

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Physical Review Applied 2025年第2期23卷 024032-024032页

作者： Huizhou Wu Guochao Wei Zhenzhen Liu Jun-Jun Xiao College of Integrated Circuit and Shenzhen Engineering Laboratory of Aerospace Detection and Imaging Harbin Institute of Technology (Shenzhen) Shenzhen 518055 China School of Mathematical and Physical Sciences Wuhan Textile University Wuhan 430200 China Research Center for Advanced Optics and Photoelectronics Department of Physics College of Science Shantou University Shantou 515063 China

The interplay between chains or layers, as additional degrees of freedom, provides an interesting approach to engineer the coupled modes in plasmonic arrays. In this study, we explore the application of interchain couplings to regulate the topological properties of a one-dimensional double chain composed of plasmonic ellipsoidal nanoparticles (ENPs). By aligning ENPs orthogonally in adjacent chains, we eliminate direct nearest-neighbor coupling across chains. We reveal that the distinctive interchain coupling enables the emergence of topological modes in the double chain, even though each individual chain is topologically trivial. We show that the double chain features three distinct topological phases, each characterized by a different number of topological modes safeguarded by the Z3 invariant. Additionally, we demonstrate that this approach can be extended to bilayer kagome arrays, also enabling multiple topological phase transitions. Our work unveils the unique topological phases in double-chain and bilayer arrays made of anisotropic plasmonic nanoparticles. The introduction of interchain or interlayer couplings opens up other directions for manipulating the topological properties of plasmonic arrays.

关键词： Degrees of freedom (mechanics)

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