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Chemical Research in Chinese Universities 2013年第2期29卷 384-388页

作者： XU Da ZHANG yu-xuan ren Dian-fu CHEN Xing-bo ZHANG Hai-bo JIANG Zhen-hua College of Chemistry Jilin University Changchun 130012 P. R. China

A series of azobenzene functionalized poly（aryl ether） copolymers（azo-PAEs） containing azo moieties on pendants was prepared by direct copolymerization. The amount of azobenzene chromophores could be controlled by the feed ratio of azo-monomer. Their chemical structures and properties were characterized by means of infrared（IR） spectrometry, UV-Vis, hydrogen nuclear magnetic resonance（Ill NMR）, difference scanning calorimetry（DSC）, and thermogravimetric analysis（TGA）. The results suggest that azo-PAEs had high glass transition temperatures（Tgs） and good thermal stability. By exposing their spin-coated films to an interference pattern laser beam, azo-PAEs could be used for the fabrication of thermal stable surface relief gratings（SRGs）.

关键词： Azo polymer Poly(aryl ether) Surface relief grating Photoactive

Broadband meta-converters for multiple Laguerre-Gaussian modes

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Photonics Research 2021年第9期9卷 1689-1698页

作者： HUADE MAO yu-xuan ren yuE yu ZEJIE yu XIANKAI SUN SHUANG ZHANG KENNETH KYWONG Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina Institute for Translational Brain Research Shanghai Medical SchoolFudan UniversityShanghai 200032China Department of Electronic Engineering The Chinese University of Hong KongHong KongChina Department of Physics The University of Hong KongHong KongChina Advanced Biomedical Instrumentation Centre Hong Kong Science ParkHong KongChina

Metasurface provides miniaturized devices for integrated ***,we design and realize a meta-converter to transform a plane-wave beam into multiple Laguerre-Gaussian(LG)modes of different orders at various diffraction *** metasurface is fabricated with Au nano-antennas,which vary in length and orientation angle for modulation of both the phase and the amplitude of a scattered wave,on a silica *** error analysis suggests that the metasurface design is robust over a 400 nm wavelength *** work presents the manipulation of LG beams through controlling both radial and azimuthal orders,which paves the way in expanding the communication channels by one more dimension(i.e.,radial order)and demultiplexing different modes.

关键词： orders radial Gaussian

Breathing dissipative soliton explosions in a bidirectional ultrafast fiber laser

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Photonics Research 2020年第10期8卷 1566-1572页

作者： YI ZHOU yu-xuan ren JIAWEI SHI KENNETH K.Y.WONG Department of Eectrical and Electronic Engineering The University of Rong KongHong KongChina

Soliton explosions,among the most exotic dynamics,have been extensively studied on parameter invariant stationary ***,the explosion dynamics are still largcly unexplored in breathing dissipative solitons as a dynamic solution to many nonlincar ***,we report on the first observation of a breathing dissipative soliton explosion in a nct-normal-dispersion bidirectional ultrafast fiber *** breathing soliton explos ionscould be stimulated by the soliton buildup process or alteration of polarization *** breathing soliton pairs with intensive repulsion that is sensitive to initial conditions can also be triggered by multiple soliton explosions in the soliton buildup process instead of being triggered by varying polarization *** high bchavior similarity also exists in the breathing soliton buildup and explosion process owing to the common gain and loss *** addition,dissipative rogue waves were detected in the breathing soliton explosion,and the collision of breathing soliton significantly enhanced the amplitude of rogue waves,which is characteristic of the breathing solitons in a bidirectional fiber *** results shed new insights into complex dissipative soliton dynamics.

关键词： dynamics. soliton dissipative

Parallelized volumetric fluorescence microscopy with a reconfigurable coded incoherent light-sheet array

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Light(Science & Applications) 2020年第1期9卷 1914-1924页

作者： yu-xuan ren Jianglai Wu Queenie T.K.Lai Hei Ming Lai Dickson M.D.Siu Wutian Wu Kenneth K.Y.Wong Kevin K.Tsia Department of Electrical and Electronic Engineering The University of Hong KongPokfulam RoadHong KongSAR 999077China Department of Physics University of CaliforniaBerkeleyCA 94720USA School of Biomedical Sciences Li Ka Shing Faculty of MedicineThe University of Hong KongHong KongSAR 999077China Department of Psychiatry Faculty of MedicineThe Chinese University of Hong KongHong KongSAR 999077China GHM Institute of CNS Regeneration Jinan University601 Huangpu Avenue WestGuangzhou 510632China Re-Stem Biotechnology Suzhou 215007China

Parallelized fluorescence imaging has been a long-standing pursuit that can address the unmet need for a comprehensive three-dimensional(3D)visualization of dynamical biological processes with minimal ***,the available approaches are limited to incomplete parallelization in only two dimensions or sparse sampling in three *** hereby develop a novel fluorescence imaging approach,called coded light-sheet array microscopy(CLAM),which allows complete parallelized 3D imaging without mechanical *** the concept of an“infinity mirror”,CLAM generates a light-sheet array with controllable sheet density and degree of ***,CLAM circumvents the common complications of multiple coherent light-sheet generation in terms of dedicated wavefront engineering and mechanical dithering/***,the encoding of multiplexed optical sections in CLAM allows the synchronous capture of all sectioned images within the imaged *** demonstrate the utility of CLAM in different imaging scenarios,including a light-scattering medium,an optically cleared tissue,and microparticles in fluidic *** can maximize the signal-to-noise ratio and the spatial duty cycle,and also provides a further reduction in photobleaching compared to the major scanning-based 3D imaging *** flexible implementation of CLAM regarding both hardware and software ensures compatibility with any light-sheet imaging modality and could thus be instrumental in a multitude of areas in biological research.

关键词： scattering light mirror

Biophotonic rogue waves in red blood cell suspensions

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Photonics Research 2023年第11期11卷 1838-1846页

作者： yu-xuan ren JOSHUA LAMSTEIN CHENSONG ZHANG CLAUDIO CONTI DEMETRIOS NCHRISTODOULIDES ZHIGANG CHEN Institute for Translational Brain Research MOE Frontiers Center for Brain ScienceFudan UniversityShanghai 200032China Department of Physics and Astronomy San Francisco State UniversitySan FranciscoCalifornia 94132USA Center for Systems and Therapeutics Gladstone InstitutesSan FranciscoCalifornia 94158USA Division of CryoEM and Bioimaging Stanford Synchrotron Radiation LightsourceSLAC National Accelerator LaboratoryMenlo ParkCalifornia 94025USA Department of Physics University SapienzaI-00185 RomaItaly Department of Electrical Engineering University of Southern CaliforniaLos AngelesCalifornia 90089USA TEDA Applied Physics Institute and School of Physics Nankai UniversityTianjin 300457China

Rogue waves are ubiquitous in nature,appearing in a variety of physical systems ranging from acoustics,microwave cavities,optical fibers,and resonators to plasmas,superfluids,and Bose–Einstein *** nonlinear solitary waves,rogue waves are extreme events that can occur even without nonlinearity by,for example,spontaneous synchronization of waves with different spatial frequencies in a linear ***,we report the observation of rogue-wave-like events in human red blood cell(RBC)suspensions under weak light illumination,characterized by an abnormal L-shaped probability *** biophotonic extreme events arise mostly due to the constructive interference of Mie-scattered waves from the suspended RBCs,whose biconcave shape and mutable orientation give rise to a time-dependent random phase modulation to an incident laser *** numerically simulate the beam propagation through the colloidal suspensions with added disorder in both spatial and temporal domains to mimic random scattering due to Brownian *** addition,at high power levels,nonlinear beam self-focusing is also observed,leading to a dual-exponential probability distribution associated with the formation of multiple soliton-like *** rogue wave events should also exist in environments with cells of other species such as swimming bacteria,and understanding of their underlying physics may lead to unexpected biophotonic applications.

关键词： suspensions extreme soliton

Optical trapping with structured light: a review

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Advanced Photonics 2021年第3期3卷 4-43页

作者： yuanjie Yang yu-xuan ren Mingzhou Chen Yoshihiko Arita Carmelo Rosales-Guzmán University of Electronic Science and Technology of China School of PhysicsChengduChina University of Hong Kong Department of Electrical and Electronic EngineeringHong Kong SARChina University of St Andrews SUPASchool of Physics and AstronomySt AndrewsUnited Kingdom Chiba University Molecular Chirality Research CenterChibaJapan Centro de Investigaciones enÓptica A.C.LeónGuanajuatoMexico Harbin University of Science and Technology Wang Da-Heng Collaborative Innovation Center for Quantum Manipulation and ControlHarbinChina

Optical trapping describes the interaction between light and matter to manipulate micro-objects through momentum *** the case of 3D trapping with a single beam,this is termed optical *** tweezers are a powerful and noninvasive tool for manipulating small objects,and have become indispensable in many fields,including physics,biology,soft condensed matter,among *** the early days,optical trapping was typically accomplished with a single Gaussian *** recent years,we have witnessed rapid progress in the use of structured light beams with customized phase,amplitude,and polarization in optical *** beam properties,such as phase singularities on-axis and propagation invariant nature,have opened up novel capabilities to the study of micromanipulation in liquid,air,and *** summarize the recent advances in the field of optical trapping using structured light beams.

关键词： optical trapping structured beams vortex beam optical angular momentum.

Maskless Microscopic Lithography through Shaping Ultraviolet Laser with Digital Micro-mirror Device

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Optics and Photonics Journal 2013年第2期3卷 227-231页

作者： Xiang-yu Ding yu-xuan ren Rong-De Lu 2Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences CAS Shanghai China 3National Center for Protein Sciences (Shanghai) Shanghai Institutes for Biological Sciences CAS Shanghai China Department of Physics University of Science and Technology of China Hefei China

Laser shaping was introduced to maskless projection soft lithography by using digital micro-mirror device (DMD). The predesigned intensity pattern was imprinted onto the DMD and the input laser beam with a Gaussian or quasi-Gaussian distribution will carry the pattern on DMD to etch the resin. It provides a method of precise control of laser beam shapes and?photon-induced curing behavior of resin. This technology provides an accurate micro-fabrication of microstructures used for micro-systems. As a virtual mask generator and a binary-amplitude spatial light modulator, DMD is equivalent to the masks in the conventional exposure system. As the virtual masks and shaped laser beam can be achieved flexibly, it is a good method of precision soft lithography for 2D/3D microstructures.

关键词： Digital Micro-mirror Device (DMD) Laser Shaping Maskless Projection Soft Lithography

Plasmonic resonant nonlinearity and synthetic optical properties in gold nanorod suspensions

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Photonics Research 2019年第1期7卷 28-35页

作者： HUIZHONG XU PEPITO ALVARO YINXIAO XIANG TREVOR S.KELLY yu-xuan ren CHENSONG ZHANG ZHIGANG CHEN Department of Physics and Astronomy San Francisco State University TEDA Applied Physics Institute and School of Physics Nankai University

We experimentally demonstrate self-trapping of light, as a result of plasmonic resonant optical nonlinearity,in both aqueous and organic(toluene) suspensions of gold nanorods. The threshold power for soliton formation is greatly reduced in toluene as opposed to aqueous suspensions. It is well known that the optical gradient forces are optimized at off-resonance wavelengths at which suspended particles typically exhibit a strong positive(or negative) polarizability. However, surprisingly, as we tune the wavelength of the optical beam from a continuous-wave(CW) laser, we find that the threshold power is reduced by more than threefold at the plasmonic resonance frequency. By analyzing the optical forces and torque acting on the nanorods, we show theoretically that it is possible to align the nanorods inside a soliton waveguide channel into orthogonal orientations by using merely two different laser wavelengths. We perform a series of experiments to examine the transmission of the soliton-forming beam itself, as well as the polarization transmission spectrum of a low-power probe beam guided along the soliton channel. It is found that the expected synthetic anisotropic properties are too subtle to be clearly observed, in large part due to Brownian motion of the solvent molecules and a limited ordering region where the optical field from the self-trapped beam is strong enough to overcome thermodynamic fluctuations. The ability to achieve tunable nonlinearity and nanorod orientations in colloidal nanosuspensions with low-power CW laser beams may lead to interesting applications in all-optical switching and transparent display technologies.

关键词： experimentally demonstrate greatly reduced suspended particles

Robust autofocusing propagation in turbulence

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Chinese Physics B 2024年第6期33卷 370-375页

作者：刘娜娜谭柳陈凯健洪佩龙莫小明邹炳锁任煜轩梁毅 Guangxi Key Laboratory for Relativistic Astrophysics Center on Nanoenergy ResearchSchool of Physical Science and TechnologyGuangxi UniversityNanning 530004China School of Mathematics and Physics Anqing Normal UniversityAnqing 246133China Institute for Translational Brain Research MOE Frontiers Center for Brain ScienceFudan UniversityShanghai 200032China

Turbulence in complex environments such as the atmosphere and biological media has always been a great challenge to the application of beam propagation in optical communication, optical trapping and manipulation. To overcome this challenge, this study comprehensively investigates the robust propagation of traditional Gaussian and autofocusing beams in turbulent environments. In order to select stable beams that exhibit high intensity and high field gradient at the focal position in complex environments, Kolmogorov turbulence theory is used to simulate the propagation of beams in atmospheric turbulence based on the multi-phase screen method. We systematically analyze the intensity fluctuations, the variation of the coherence factor and the change in the scintillation index with propagation distance. The analysis reveals that the intensity fluctuations of autofocusing beams are significantly smaller than those of Gaussian beams, and the coherence of autofocusing beams is better than that of Gaussian beams under turbulence. Moreover, autofocusing beams exhibit less oscillation than Gaussian beams, indicating that autofocusing beams propagate in complex environments with less distortion and intensity fluctuation. Overall, this work clearly demonstrates that autofocusing beams exhibit higher stability in propagation compared with Gaussian beams, showing great promise for applications such as optical trapping and manipulation in complex environments.

关键词： propagation beams autofocusing turbulence

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矿山掘进巷道顶板分类及稳定性研究

世界有色金属 2019年第13期44卷 263-263,265页

作者：于玄任神东煤炭集团大柳塔煤矿

在矿井掘进过程中,巷道顶板发生安全事故占有非常大的比重,因此在掘进工作中,加强对巷道顶板稳定性研究十分必要,这种做法能够有效减少采矿中出现事故的概率,保证矿井采掘过程中人员的安全,为矿企带来更大的经济效益。国内外将矿山巷道... 详细信息

在矿井掘进过程中,巷道顶板发生安全事故占有非常大的比重,因此在掘进工作中,加强对巷道顶板稳定性研究十分必要,这种做法能够有效减少采矿中出现事故的概率,保证矿井采掘过程中人员的安全,为矿企带来更大的经济效益。国内外将矿山巷道顶板稳定性进行分类正由单因素定性分类向多因素、多定量、多指标的综合模式发展。虽然分类方法及侧重点有所不同,但是其最终目的都是反映矿山巷道结构的复杂性,为矿山巷道支护参数及稳定性评价提供理论依据。

关键词：矿山掘进巷道顶板稳定性