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Temperature-driven reversible structural transformation and conductivity switching in ultrathin Cu_(9)S_(5)crystals

Nano Research 2023年第7期16卷 10515-10521页

作者： Lei Zhang Zeya Li Ying Deng Li Li Zhansheng Gao Jiabiao Chen Zhengyang Zhou Junwei Huang Weigao Xu Xuewen Fu Hongtao Yuan Feng Luo Jinxiong Wu Tianjin key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSmart Sensor Interdisciplinary Science CenterSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China National laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Ultrafast Electron Microscopy laboratory The Ministry of Education(MOE)Key Laboratory of Weak-Light Nonlinear PhotonicsSchool of PhysicsNankai UniversityTianjin 300071China school of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200093China

Two-dimensional(2D)materials with reversible phase transformation are appealing for their rich physics and potential applications in information ***,up to now,reversible phase transitions in 2D materials that can be driven by facile nondestructive methods,such as temperature,are still ***,we introduce ultrathin Cu_(9)S_(5)crystals grown by chemical vapor deposition(CVD)as an exemplary *** the first time,their basic electrical properties were investigated based on Hall measurements,showing a record high hole carrier density of~1022 cm^(-3) among 2D ***,an unusual and repeatable conductivity switching behavior at~250 K were readily observed in a wide thickness range of CVD-grown Cu_(9)S_(5)(down to 2 unit-cells).Confirmed by in-situ selected area electron diffraction,this unusual behavior can be ascribed to the reversible structural phase transition between the room-temperature hexagonalβphase and low-temperatureβ’phase with a *** work provides new insights to understand the physical properties of ultrathin Cu_(9)S_(5)crystals,and brings new blood to the 2D materials family with reversible phase transitions.

关键词： ultrathin Cu_(9)S_(5)crystals ultrahigh carrier density reversible phase transition conductivity switching chemical vapor deposition

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Plasmonic tip internally excited via an azimuthal vector beam for surface enhanced Raman spectroscopy

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photonics Research 2019年第5期7卷 526-531页

作者： Min Liu Wending Zhang Fan fan Lu Tianyang Xue Xin Li Lu Zhang Dong Mao Ligang Huang Feng Gao Ting Mei Jianlin Zhao moe key laboratory of Material physics and Chemistry under Extraordinary Conditions and Shaanxi key laboratory of Optical Information Technology School of Science Northwestern Polytechnical University Xi'an 710072 China moe key laboratory of Optoelectronic Technology and Systems Chongqing University Chongqing 400044 China moe key laboratory of weak-light nonlinear photonics TEDA Applied Physics Institute and School of Physics Nankai University Tianjin 300457 China

The synergy of a plasmonic tip and fiber-based structure light field excitation can provide a powerful tool for Raman examination. Here, we present a method of Raman spectrum enhancement with an Ag-nanoparticles(Ag-NPs)-coated fiber probe internally excited via an azimuthal vector beam(AVB), which is directly generated in a few-mode fiber by using an acoustically induced fiber grating. Theoretical analysis shows that gap mode can be effectively generated on the surface of the Ag-NPs-coated fiber probe excited via an AVB. The experimental result shows that the intensity of Raman signal obtained with analyte molecules of malachite green by exciting the Ag-NPs-coated fiber probe via an AVB is approximately eight times as strong as that via the linear polarization beam(LPB), and the activity of the AVB-excited fiber probe can reach 10^-11 mol∕L, which cannot be achieved by LPB ***, the time stability and reliability are also examined, respectively.

关键词： Raman spectroscopy azimuthal vector beam(AVB) Ag-nanoparticles(Ag-NPs) linear polarization beam(LPB)

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Emerging material platforms for integrated microcavity photonics

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Science China(physics,Mechanics & Astronomy) 2022年第10期65卷 10-28页

作者： Jin Liu Fang Bo Lin Chang Chun-Hua Dong Xin Ou Blake Regan Xiaoqin Shen Qinghai Song Baicheng Yao Wenfu Zhang Chang-Ling Zou Yun-Feng Xiao State key laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510000China moe key laboratory of weak-light nonlinear photonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300071China State key laboratory of Advanced Optical Communications System and Networks School of ElectronicsPeking UniversityBeijing 100871China CAS key Lab of Quantum Information University of Science and Technology of ChinaHefei 230026China State key laboratory of Functional Material for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China school of Mathematical and Physical Sciences University of Technology SydneyUltimo 2007Australia school of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Ministry of Industry and Information Technology key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of TechnologyShenzhen 518055China key laboratory of Optical Fiber Sensing and Communications(Ministry of Education) University of Electronic Science and Technology of ChinaChengdu 611731China State key laboratory of Transient Optics and photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China State key laboratory for Mesoscopic physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China

Many breakthroughs in technologies are closely associated with the deep understanding and development of new material *** the main material used in microelectronics,Si also plays a leading role in the development of integrated *** indirect bandgap,absence ofχ(2)nonlinearity and the parasitic nonlinear absorptions at the telecom band of Si imposed technological bottlenecks for further improving the performances and expanding the functionalities of Si microcavities in which the circulating light intensity is dramatically *** past two decades have witnessed the burgeoning of the novel material platforms that are compatible with the complementary metal-oxide-semiconductor(COMS)*** particular,the unprecedented optical properties of the emerging materials in the thin film form have resulted in revolutionary progress in microcavity *** this review article,we summarize the recently developed material platforms for integrated photonics with the focus on chip-scale microcavity *** material characteristics,fabrication processes and device applications have been thoroughly discussed for the most widely used new material *** also discuss open challenges and opportunities in microcavity photonics,such as heterogeneous integrated devices,and provide an outlook for the future development of integrated microcavities.

关键词： microcavity integrated optics nonlinear optics

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Highly Directional Emission from a Subwavelength Slit in Metal-Dielectric Layered Films

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Chinese physics Letters 2006年第5期23卷 1207-1210页

作者：李祖斌田建国周文远刘智波臧维平张春平 The moe key Lab of Advanced Technique & Fabrication for weak-light nonlinear photonics Materials and Tianjin Key Lab of Photonics Materials & Technology for Information Science Nankai University Tianjin 300457

The directional light emission from a single subwavelength slit surrounded by periodic grooves in layered films consisting of Ag and transparent dielectric is analysed numerically by the finite difference time domain method. The results show that the transmission through this structure is strongly confined by the modulation of the dielectric film with grooves on the output side. The role of evanescent waves in this phenomenon is discussed. It is the re-diffraction of the evanescent waves （that are generated by the diffraction of the subwavelength slit） caused by the grooves on the dielectric film that leads to the directional transmission. Some suggestions are given to obtain beaming light with high transmittance.

关键词： ENHANCED MICROWAVE TRANSMISSION APERTURE RADIATION light

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Dimension-dependent mechanical features of Au-nanocrystalline nanofilms

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Nano Research 2023年第12期16卷 13400-13408页

作者： Lijun Ma Lena Du Shu Wang Qing Wang Shifeng Xue Hanxing Zhu Qian Liu Department of Engineering Mechanics College of Pipeline and Civil EngineeringChina University of Petroleum(East China)Qingdao 266580China CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology&University of Chinese Academy of SciencesBeijing 100190China Department of physics Capital Normal UniversityBeijing 100048China school of Engineering Cardiff UniversityCardiff CF243AAUK moe key laboratory of weak-light nonlinear photonics TEDA Applied Physics InstituteSchool of PhysicsNankai UniversityTianjin 300457China College of Mechanical and Architectural Engineering Taishan UniversityTai’an 271000China

For metal nanofilms composed of nanocrystals,the multiple deformation mechanisms will coexist and bring unique and complex elastic-plastic and fracture mechanical *** successfully fabricating large quantities of uniform doubly-clamped suspended gold(Au)nanobeams with different thicknesses and nanograin sizes,we obtain full-spectrum mechanical features with statistical significance by combining atomic force microscopy(AFM)nanoindentation experiments,nonlinear theoretical model,and numerical *** yield and breaking strengths of the Au nanobeams have a huge increase by nearly an order of magnitude compared with bulk Au and exhibit strong nonlinear effects,and the corresponding strong-yield ratio is up to 4,demonstrating extremely high strength reserve and vibration *** strong-yield ratio gradually decreases with decreasing thickness,identifying a conversion of the failure type from ductile to ***,the Hall–Petch relationship has been identified to be still valid at the nanoscale,and K in the equation reaches 4.8 Gpa·nm1/2,nearly twice of bulk nanocrystalline Au,which is ascribed to the coupling effect of nanocrystals and nanoscale thickness.

关键词： nanocrystalline Au nanobeams atomic force microscopy numerical simulations full-spectrum mechanical properties

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Multi-Path Ghost Imaging by Means of an Additional Time Correlation

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Chinese physics Letters 2019年第4期36卷 39-42页

作者：刘瑞孔令军司宇王周祥齐文荣涂成厚李勇男王慧田 key laboratory of weak-light nonlinear photonics and school of physics Nankai University National laboratory of Solid State Microstructures Nanjing University Collaborative Innovation Center of Advanced Microstructures Nanjing University

Ghost imaging functions achieved by means of the spatial correlations between two photons is a new modality in imaging systems. With a small number of photons, ghost imaging is usually realized based on the position correlation of photon pairs produced from the spontaneous parametric down-conversion process. Here we demonstrate a way to realize multi-path ghost imaging by introducing an additional time correlation. Different delays of paths will induce the shift of the coincidence peak, which carries the information about objects. By choosing the suitable coincidence window, we obtain images of three objects simultaneously, with a visibility of 87.2%.This method provides insights and techniques into multi-parameter ghost imaging. It can be applied to other correlated imaging systems, for example, quantum spiral imaging.

关键词： Time images techniques

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Regulation of actin cytoskeleton via photolithographic micropatterning

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Journal of Innovative Optical Health Sciences 2023年第2期16卷 50-57页

作者： Fulin Xing Haimei Zhang Mengyu Li Hao Dong Xuehe Ma Shiyu Deng Fen Hu Imshik Lee Leiting Pan Jingjun Xu The key laboratory of weak-light nonlinear photonics of Education Ministry school of physics and TEDA Institute of Applied physics Nankai University Tianjin 300071 P.R.China State key laboratory of Medicinal Chemical Biology Frontiers Science Center for Cell Responses College of Life Sciences Nankai University Tianjin 300071P.R.China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan Shanxi 030006P.R.China Shenzhen Research Institute of Nankai University Shenzhen Guangdong 518083P.R.China

Actin cytoskeleton plays crucial roles in various cellular *** matrix(ECM)can modulate cell morphology by remodeling the internal *** define how geometry of ECM regulates the organization of actin cytoskeleton,we plated individual NIH 3T3 cells on micropatterned substrates with distinct shapes and *** was found that the stress fibers could form along the nonadhesive edges of T-shaped pattern,but were absent from the opening edge of V-shaped pattern,indicating that the organization of actin cytoskeleton was dependent on the mechanical ***,a secondary actin ring was observed on 50μm circular pattern while did not appear on 30μm and 40μm pattern,showing a size-dependent organization of actin ***,osteoblasts,MDCK and A549 cells exhibited distinct organization of actin cytoskeleton on T-shaped pattern,suggesting a cell-type specificity in arrangement of actin ***,our findings brought novel insight into the organization of actin cytoskeleton on micropatterned environments.

关键词： Actin cytoskeleton photolithography micropatterning extracellular matrix

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Stronger Hardy-like proof of quantum contextuality

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photonics Research 2022年第7期10卷 1582-1593页

作者： WEN-RONG QI JIE ZHOU LING-JUN KONG ZHEN-PENG XU HUI-XIAN MENG RUI LIU ZHOU-XIANG WANG CHENGHOU TU YONGNAN LI ADAN CABELLO JING-LING CHEN HUI-TIAN WANG key laboratory of weak-light nonlinear photonics and school of physics Nankai UniversityTianjin 300071China school of physics Henan Normal UniversityXinxiang 453007China Theoretical physics Division Chern Institute of MathematicsNankai UniversityTianjin 300071China National laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Naturwissenschaftlich-Technische Fakultät Universität Siegen57068 SiegenGermany Departamento de Física Aplicada II Universidad de SevillaE-41012 SevillaSpain

A Hardy-like proof of quantum contextuality is a compelling way to see the conflict between quantum theory and noncontextual hidden variables(NCHVs),as the latter predict that a particular probability must be zero,while quantum theory predicts a nonzero *** the existing Hardy-like proofs,the success probability tends to 1/2when the number of measurement settings n goes to *** means the conflict between the existing Hardy-like proof and NCHV theory is weak,which is not conducive to experimental *** we advance the study of a stronger Hardy-like proof of quantum contextuality,whose success probability is always higher than the previous ones generated from a certain n-cycle ***,the success probability tends to 1 when n goes to *** perform the experimental test of the Hardy-like proof in the simplest case of n=7 by using a four-dimensional quantum system encoded in the polarization and orbital angular momentum of single *** experimental result agrees with the theoretical prediction within experimental *** addition,by starting from our Hardy-like proof,one can establish the stronger noncontextuality inequality,for which the quantumclassical ratio is higher with the same n,which provides a new method to construct some optimal noncontextuality *** results offer a way for optimizing and enriching exclusivity graphs,helping to explore more abundant quantum properties.

关键词： properties proof quantum

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Observation of polarization topological singular lines

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photonics Research 2019年第6期7卷 705-710页

作者： GUAN-LIN ZHANG CHENGHOU TU YONGNAN LI HUI-TIAN WANG moe key laboratory of weak light nonlinear photonics and school of physics Nankai University Tianjin 300071 China National laboratory of Solid State Microstructures and school of physics Nanjing UniversityUniversity Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

We have theoretically designed and experimentally observed free-space propagation of topological singular lines of cylindrical vector optical fields with non-integer topological charges. The polarization singular lines are due to the orientation uncertainty of the polarization states, caused by non-integer topological charges. The results reveal that during propagation, evolution of the polarization singular lines results in the special intensity pattern,distribution of polarization states, and chains of polarization singularities. We have also proposed a method to generate triple straight and spiral singular lines, which may contribute to the research of complex optical fields.

关键词： topological singular lines polarization

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Visualization of a Maze-Like Reconstruction of Graphene on a Copper Surface at the Atomic Scale

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Chinese physics Letters 2013年第5期30卷 120-123页

作者：谢楠宮会期周智郭晓东颜世超孙骞邢思锐吴纬白先慎包吉明单欣岩郭阳陆兴华 The moe key laboratory of weak-light nonlinear photonics Tianjin Key Laboratory of Photonics Materials and Technology for Information ScienceSchool of PhysicsNankai UniversityTianjin 300071 Beijing National laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190 Department of Electrical and Computer Engineering University of HoustonHoustonTX 77204USA

Interaction with the substrate plays an essential role in determining the structure and electronic property of graphene supported by a *** observe a maze-like reconstruction pattern in graphene on flat copper *** functionalized scanning tunneling microscope tips,a triangular three-for-six structure of graphene and a mixed(2√2×√2)R45°reconstruction of a Cu(100)surface are separately visualized at the atomic ***-induced changes in the structure and electronic property are further illustrated by micro-Raman spectroscopy and scanning tunneling *** finding suggests a new method to effectively induce partial sp3 hybridization in a single-layer graphene and therefore to tune its electronic property through interaction with the substrate.

关键词： spectroscopy surface property

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