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Mechanically reprogrammable Pancharatnam-Berry metasurface for microwaves

Advanced Photonics 2022年第1期4卷 69-79页

作者： Quan Xu Xiaoqiang Su Xueqian Zhang Lijuan Dong Lifeng Liu Yunlong Shi Qiu Wang Ming Kang Andrea Alù Shuang Zhang Jiaguang Han Weili Zhang Tianjin University Center for Terahertz Waves and College of Precision Instrument and Optoelectronics EngineeringKey Laboratory of Optoelectronic Information Technology(Ministry of Education of China)TianjinChina Shanxi Datong University Institute of Solid State Physics and College of Physics and Electronic ScienceShanxi Province Key Laboratory of Microstructure Electromagnetic Functional MaterialsDatongChina Wuhan University of Technology School of Information EngineeringWuhanChina Tianjin Normal University College of Physics and Materials ScienceTianjinChina City University of New York Advanced Science Research CenterPhotonics InitiativeNew YorkUnited States City University of New York Graduate CenterPhysics ProgramNew YorkUnited States University of Hong Kong Faculty of ScienceDepartment of PhysicsHong KongChina University of Hong Kong Department of Electrical and Electronic EngineeringHong KongChina Guilin University of Electronic Technology Guangxi Key Laboratory of Optoelectronic Information ProcessingSchool of Optoelectronic EngineeringGuilinChina Oklahoma State University School of Electrical and Computer EngineeringStillwaterOklahomaUnited States

Metasurfaces have enabled the realization of several optical functionalities over an ultrathin platform,fostering the exciting field of flat *** metasurfaces are achieved by arranging a layout of static meta-atoms to imprint a desired operation on the impinging wavefront,but their functionality cannot be *** and programmability of metasurfaces are the next important step to broaden their impact,adding customized on-demand functionality in which each meta-atom can be individually *** demonstrate a mechanical metasurface platform with controllable rotation at the meta-atom level,which can implement continuous Pancharatnam–Berry phase control of circularly polarized *** the proof-of-concept experiments,we demonstrate metalensing,focused vortex beam generation,and holographic imaging in the same metasurface template,exhibiting versatility and superior *** dynamic control of electromagnetic waves using a single,low-cost metasurface paves an avenue towards practical applications,driving the field of reprogrammable intelligent metasurfaces for a variety of applications.

关键词： reprogrammable metasurfaces Pancharatnam-Berry phase mechanical metasurfaces microwaves

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Active beam steering enabled by photonic crystal surface emitting laser

Active beam steering enabled by photonic crystal surface emi...

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Optoelectronics and Communications Conference, OECC

作者： Jiahao Si Mingjin Wang Zihao Chen Yuanbo Xu Jingxuan Chen Zheng Zhang Wenzhen Liu Chao Peng Wanhua Zheng Laboratory of Solid State Optoelectronics Information Technology Institute of Semiconductors CAS Beijing China Laboratory of Solid State Optoelectronics Information Technology State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors CAS Beijing China Department of Electronics & Frontiers Science Center for Nano-optoelectronics State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China Huawei Technologies Co. Ltd. Wuhan China Peng Cheng Laboratory Shenzhen China Laboratory of Solid State Optoelectronics Information Technology State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors CAS College of Future Technology Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing China

A dynamically controlled beam steering photonic crystals surface-emitting laser is proposed in this work. We demonstrate its fast beam steering across a range of $3.2^{\circ} \times 4^{\circ}$ in a time scale of 500 n...

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Crystalline Structure-Dependent Mechanical and Thermoelectric Performance in Ag_(2)Se_(1‐x)S_(x)System

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research 2020年第1期2020卷 1089-1098页

作者： Jiasheng Liang Pengfei Qiu Yuan Zhu Hui Huang Zhiqiang Gao Zhen Zhang Xun Shi Lidong Chen State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Division of Solid-State Electronics Department of Electrical EngineeringUppsala UniversityUppsalaSweden School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Self-powered wearable electronics require thermoelectric materials simultaneously with a high dimensionless figure of merit(zT)and good flexibility to convert the heat discharged by the human body into ***_(2)(S,Se)-based semiconducting materials can well satisfy these requirements,and thus,they are attracting great attention in thermoelectric society ***_(2)(S,Se)crystalizes in an orthorhombic structure or monoclinic structure,depending on the detailed S/Se atomic ratio,but the relationship between its crystalline structure and mechanical/thermoelectric performance is still unclear to *** this study,a series of Ag_(2)Se_(1-x)S_(x)(x=0,0.1,0.2,0.3,0.4,and 0.45)samples were prepared and their mechanical and thermoelectric performance dependence on the crystalline structure was systematically investigated.x=0:3 in the Ag_(2)Se_(1-x)S_(x)system was found to be the transition boundary between orthorhombic and monoclinic *** property measurement shows that the orthorhombic Ag_(2)Se_(1-x)S_(x)samples are brittle while the monoclinic Ag_(2)Se_(1-x)S_(x)samples are ductile and *** addition,the orthorhombic Ag_(2)Se_(1-x)S_(x)samples show better electrical transport performance and higher zT than the monoclinic samples under a comparable carrier concentration,most likely due to their weaker electron-phonon *** study sheds light on the further development of flexible inorganic TE materials.

关键词： ductile crystalline attracting

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Symmetry selective directionality in near-field acoustics

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National science Review 2020年第6期7卷 1024-1035页

作者： Yang Long Hao Ge Danmei Zhang Xiangyuan Xu Jie Ren Ming-Hui Lu Ming Bao Hong Chen Yan-Feng Chen Center for Phononics and Thermal Energy Science China-EU Joint Center for Nanophononics Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Sciences and Engineering Tongji University Department of Materials Science and Engineering College of Engineering and Applied Sciences and National Laboratory of Solid State Microstructures Nanjing University Key Laboratory of Noise and Vibration Research Institute of Acoustics Chinese Academy of Sciences Collaborative Innovation Center of Advanced Microstructures Nanjing University Key Laboratory of Noise and Vibration Research Institute of Acoustics Chinese Academy of Sciences Beijing 100190 China and4Collaborative Innovation Center of Advanced Microstructures Nanjing University

Understanding unidirectional and topological wave phenomena requires the unveiling of intrinsic geometry and symmetry for wave dynamics. This is essential yet challenging for the flexible control of near-field evanescent waves, highly desirable in broad practical scenarios ranging from information communication to energy radiation. However, exploitations of near-field waves are limited by a lack of fundamental understanding about inherent near-field symmetry and directional coupling at sub-wavelengths, especially for longitudinal waves. Here, based on the acoustic wave platform, we show the efficient selective couplings enabled by near-field symmetry properties. Based on the inherent symmetry properties of three geometrically orthogonal vectors in near-field acoustics, we successfully realize acoustic Janus, Huygens,spin sources and quadrupole hybrid sources, respectively. Moreover, we experimentally demonstrate fertile symmetry selective directionality of those evanescent modes, supported by two opposite meta-surfaces. The symmetry properties of the near-field acoustic spin angular momenta are revealed by directly measuring local vectorial fields. Our findings advance the understanding of symmetries in near-field physics, supply feasible approaches for directional couplings, and pave the way for promising acoustic devices in the future.

关键词： acoustics near field symmetry

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A high efficiency electrolyte enables robust inorganic–organic solid electrolyte interfaces for fast Li metal anode

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science Bulletin 2021年第9期66卷 897-903,M0004页

作者： Feilong Qiu Siyun Ren Xueping Zhang Ping He Haoshen Zhou Center of Energy Storage Materials&Technology College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsNational Laboratory of Solid-State Microstructures and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Tsukuba 3058568Japan

Developing a high-rate Li metal anode with superior reversibility is a prerequisite for fast-charging Li metal ***,the build-up of large concentration gradients under high current density leads to inhomogeneous Li deposition and unstable passivation layers of Li metal,resulting in lower Coulombic *** we report a concentrated dual-salts LiFSI-LiNO_(3)/DOL electrolyte to improve the high-rate performance of Li metal *** Li salts help passivate the fresh Li deposition ***,DOL contributes to the formation of flexible organic layers that can accommodate the rapid volume change of Li metal upon *** metal in the electrolyte remains stable over 240 cycles with the average Coulombic efficiency of 99.14%under a high current density of 8.0 mA cm^(-2).

关键词： Lithium metal anode Concentrated electrolyte Coulombic efficiency Edge effect

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Heteroepitaxy of large-area, monocrystalline lead halide perovskite films on gallium arsenide

arXiv

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arXiv 2022年

作者： Kong, Deying Zhang, Yu Cheng, Dali Wang, Enze Zhang, Kaiyuan Wang, Huachun Liu, Kai Yin, Lan Sheng, Xing School Of Materials Science And Engineering The Key Laboratory Of Advanced Materials Of Ministry Of Education State Key Laboratory Of New Ceramics And Fine Processing Center For Flexible Electronics Technology Tsinghua University Beijing China Department Of Physics Tsinghua University Beijing China Department Of Electronic Engineering Beijing National Research Center For Information Science And Technology Center For Flexible Electronics Technology IDG/McGovern Institute For Brain Research Tsinghua University Beijing China

Lead halide perovskite materials have been emerging as promising candidates for highperformance optoelectronic devices. Significant efforts have sought to realize monocrystalline perovskite films at a large scale. Here, we epitaxially grow monocrystalline methylammonium lead tribromide (MAPbBr3) films on lattice-matched gallium arsenide (GaAs) substrates at a centimeter scale. In particular, a solutionprocessed lead(II) sulfide (PbS) layer provides a lattice-matched and chemical protective interface for the solid-gas reaction to form MAPbBr3films on GaAs. Structure characterizations identify the crystal orientations in the trilayer MAPbBr3/PbS/GaAs epi-structure and confirm the monocrystalline nature of MAPbBr3on PbS/GaAs. The dynamic evolution of surface morphologies during the growth indicates a two-step epitaxial process. These fundamental understandings and practical growth techniques offer a viable guideline to approach high-quality perovskite films for previously inaccessible applications. © 2022, CC BY-NC-ND.

关键词： Lead compounds

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A high-capacity cathode for rechargeable K-metal battery based on reversible superoxide-peroxide conversion

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National science Review 2021年第10期8卷 33-41页

作者： Yu Qiao Han Deng Zhi Chang Xin Cao Huijun Yang Haoshen Zhou Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Center of Energy Storage Materials &Technology College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsNational Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced MicrostructuresNanjing University

As a promising low-cost energy storage device, the development of a rechargeable potassium-ion battery（KIB） is severely hindered by the limited capacity of cathode candidates. Regarded as an attractive capacity-boosting strategy, triggering the O-related anionic redox activity has not been achieved within a sealed KIB system. Herein, in contrast to the typical gaseous open K-O2battery（O2/KO2redox）, we originally realize the reversible superoxide/peroxide（KO2/K2O2） interconversion on a KO2-based cathode. Controlled within a sealed cell environment, the irreversible O2evolution and electrolyte decomposition(induced by superoxide anion（O2-） formation) are effectively restrained. Rationally controlling the reversible depth-of-charge at 300 m Ah/g（based on the mass of KO2）, no obvious cell degradation can be observed during 900 cycles. Moreover, benefitting from electrolyte modification, the KO2-based cathode is coupled with a limited amount of K-metal anode（merely 2.5 times excess）,harvesting a K-metal full-cell with high energy efficiency（～90%） and long-term cycling stability（over 300 cycles）.

关键词： electrochemistry rechargeable battery beyond Li-ion battery long-term cycle life high capacity cathode

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Nonperturbative effects of attraction on dynamical behaviors of glass-forming liquids

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Chinese Physics B 2020年第12期29卷 396-401页

作者： Xiaoyan Sun Haibo Zhang Lijin Wang Zexin Zhang Yuqiang Ma Wenzheng College of Soochow University Suzhou 215104China Center for Soft Condensed Matter Physics and Interdisciplinary Research Soochow UniversitySuzhou 215006China School of Physics and Materials Science Anhui UniversityHefei 230601China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093China

We investigate systematically the effects of the inter-particle attraction on the structure and dynamical behaviors of glass-forming liquids via molecular dynamics *** find that the inter-particle attraction does not influence the structure,but greatly affects the dynamics and dynamical heterogeneity of the *** the system changes from a purely repulsive glass-forming liquid to an attractive one,the dynamics slows down and the dynamical heterogeneity becomes greater,which is found interestingly to be associated with larger cooperative rearrangement regions(CRRs).Additionally,the structures of CRRs are observed to be compact in attractive glass-forming liquids but string-like in purely repulsive *** findings constitute an important contribution to the ongoing study of the role of attractions in properties of glasses and glass-forming liquids.

关键词： attractive glass dynamics dynamical heterogeneity cooperative rearrangement regions(CRRs)

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Greatly promoted oxygen reduction reaction activity of solid catalysts by regulating the stability of superoxide in metal-O_(2)batteries

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science China materials 2021年第4期64卷 870-879页

作者： Hua Wang Liangliang Liu Xiao Liu Yu Jia Peng Zhang Yong Zhao Key Lab for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-efficiency Display and Lighting TechnologySchool of Materials Science and EngineeringCollaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China Department of Materials Science&Engineering ShenzhenKey Laboratory of Solid State Batteries ShenzhenGuangdong Provincial Key Laboratory of Energy Materials for Electric PowerSouthern University of Science and TechnologyShenzhen 518055China College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China

Oxygen reduction reactions(ORRs)with one-or two-electron-transfer pathways are the essential process for aprotic metal-oxygen batteries,in which the stability of superoxide intermediates/products(O_(2)^(-),LiO_(2),NaO_(2),etc.)mainly dominates the ORR activity/stability and battery ***,little success in regulating the stability of the superoxides has been achieved due to their highly reactive ***,we identified and modulated the stability of superoxides by introducing anthraquinone derivatives as cocatalysts which functioned as superoxide trapper adsorbing the superoxides generated via surface-mediated ORR and then transferring them from the solid catalyst surface into *** the studied trappers,1,4-difluoroanthraquinone(DFAQ)with electron-withdrawing groups showed the highest adsorption towards superoxides and could efficiently stabilize LiO_(2)in electrolyte,which greatly promoted the surface-mediated ORR rate and *** highlighted the magnitude of adsorption between the trapper and LiO_(2)on the ORR activity/*** an aprotic Li-O_(2)battery as a model metal-O_(2)battery,the overall performance of the cell with DFAQ was substantially improved in terms of cell capacity,rate capability and cyclic *** results represent a significant advance in the understanding of ORR mechanisms and promoting the performance of metal-O_(2)batteries.

关键词： oxygen reduction reaction adsorption energy superoxide lithium oxygen battery

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Three-dimensional MXenes heterostructures and their applications

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science China materials 2022年第11期65卷 2895-2910页

作者： Jizhou Jiang Fangyi Li Jing Zou Song Liu Jiamei Wang Yilun Zou Kun Xiang Han Zhang Guoyin Zhu Yizhou Zhang Xianzhu Fu Jyh-Ping Hsu School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205 Key Laboratory of Rare Mineral Ministry of Natural ResourcesGeological Experimental Testing Center of Hubei ProvinceWuhan 430034 Institute of Chemical Biology and Nanomedicine(ICBN) State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082 College of Materials Science and Engineering Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen 518060 Institute of Advanced Materials and Flexible Electronics(IAMFE) School of Chemistry and Materials ScienceNanjing University of Information Science&TechnologyNanjing 210044 Department of Chemical Engineering “National”Taiwan UniversityTaipei 10617

Due to their unique surface chemistry,highly adjustable metal components,hydrophilicity,and high carrier concentrations,MXenes are applied in a variety of *** to other two-dimensional(2D)materials,building heterostructures with additional materials to form a 3D porous architecture for MXenes can significantly enhance their functionality and ***,the open structures and well-defined pathways of these 3D structured MXenes can improve ionic and electronic transport,thereby promoting their applications in electrochemical energy storage,sensing,catalysis,and *** this review,the recent efforts made on preparing 3D porous MXenes with heterostructures,focusing on MXenes/C,MXenes/inorganics,and MXenes/polymers were *** discussion covers aspects ranging from the design to synthesis of 3D porous MXenes,and their applications in photocatalysis,environmental monitoring and electrochemical energy *** review is concluded by presenting the prospects and insights on exploring the relationships between the porosity formation mechanisms,properties and applications of the 3D porous MXenes *** review can provide meaningful guidance for the design,fabrication and application of 3D porous MXenes in high-performance materials and devices.

关键词： 3D porous MXenes MXenes heterostructures photocatalysis environmental monitoring electrochemical energy storage

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