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AI and Optical Data sciences IV 2023

作者： Ramezani, Fereshteh Parvez, Sheikh Fix, J. Pierce Battaglin, Arthur Whyte, Seamus Borys, Nicholas J. Whitaker, Bradley Electrical and Computer Engineering Department Montana State University Bozeman United States Department of Physics Montana State University Bozeman United States Materials Science Program Montana State University Bozeman United States Optical Technology Center Montana State University Bozeman United States

ISBN: (纸本)9781510659810

Computer vision algorithms can quickly analyze numerous images and identify useful information with high accuracy. Recently, computer vision has been used to identify 2D materials in microscope images. 2D materials have important fundamental properties allowing for their use in many potential applications, including many in quantum information science and engineering. In order to use these materials for research and product development, single-layer 2D crystallites must be prepared through an exfoliation procedure and then identified using reflected light optical microscopy. Performing these searches manually is a time-consuming and tedious task. Deploying deep learning-based computer vision algorithms for 2D material search can automate the flake detection task with minimal need for human intervention. In this work, we have implemented a new deep learning pipeline to classify crystallites of 2D materials based on coarse thickness classifications in reflected-light optical micrographs. We have used DetectorRS as the object detector and trained it on 177 images containing hexagonal boron nitride (hBN) flakes of varying thickness. The trained model achieved a high detection accuracy for the rare category of thin flakes ( © 2023 SPIE.

关键词： Object detection

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Single-fundamental-mode cryogenic(3.6 K)850-nm oxideconfined VCSEL

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Journal of Semiconductors 2024年第10期45卷 69-73页

作者： Anjin Liu Chenxi Hao Jingyu Huo Hailong Han Minglu Wang Bao Tang Lingyun Li Lixing You Wanhua Zheng Key Laboratory of Optoelectronic Materials and Devices Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Shanghai Key Laboratory of Superconductor Integrated Circuit Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Accelink technologies co. LtdWuhan 430205China Key Laboratory of Solid-State Optoelectronics Information Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Cryogenic oxide-confined vertical-cavity surface-emitting laser(VCSEL)has promising application in cryogenic optical interconnect for cryogenic *** this paper,we demonstrate a cryogenic 850-nm oxide-confined VCSEL at around 4 *** cryogenic VCSEL with an optical oxide aperture of 6.5μm in diameter can operate in single fundamental mode with a side-mode suppression-ratio of 36 dB at 3.6 K,and the fiber-coupled output power reaches 1 mW at 5 *** small signal modulation measurements at 298 and 292 K show the fabricated VCSEL has the potential to achieve a high modulation bandwidth at cryogenic temperature.

关键词： VCSEL cryogenic temperature cryogenic computing optical interconnect

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Antibacterial evaporator based on reduced graphene oxide/polypyrrole aerogel for solar-driven desalination

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Nano Research 2023年第4期16卷 4219-4224页

作者： Mengru Zhang Fan Xu Wenjie Liu Yaqi Hou Liyun Su Xin Zhang Ruihua Zhang Lijun Zhou Xiaomei Yan Miao Wang Xu Hou Yang Cao State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Department of Chemical Biology MOE Key Laboratory of Spectrochemical Analysis&InstrumentationKey Laboratory for Chemical Biology of Fujian ProvinceCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of Materials Xiamen UniversityXiamen 361005China College of Physical Science and Technology Xiamen UniversityXiamen 361005China Tan Kah Kee Innovation Laboratory Xiamen 361005China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China

Solar-driven water evaporation is a sustainable method to purify ***,traditional volumetric water-evaporation systems suffer from the poor sunlight absorption and inefficient light-to-thermal ***,their anti-bacterial and antifouling performances are crucial for the practical ***,we introduce reduced graphene oxide(RGO)with broadband absorbance across the entire solar spectrum,and polypyrrole(PPy),an antibacterial polymer with efficient solar absorption and low thermal conductivity,to develop integrated RGO/PPy aerogel as both the solar absorber and evaporator for highly efficient solar-driven steam *** a result,the RGO/PPy aerogel shows strong absorption and good photothermal performance,leading to an evaporation rate of 1.44 kg·m^(−2)·h^(−1)and high salt rejection(up to 99.99%)for real seawater,with photothermal conversion efficiency>90%under one sun *** result is attributed to the localized heat at the air-water interface by the RGO/PPy and its porous nature with functional groups that facilitates the water ***,the RGO/PPy demonstrates excellent durability and antibacterial efficiency close to 100%for 12 h,crucial characteristics for longterm *** well-designed RGO/PPy aerogel with efficient water desalination performance and antibacterial property provides a straightforward approach to improve the solar-driven evaporation performance by multifunctional materials integration,and offers a viable route towards practical seawater desalination.

关键词： solar-driven steam generation interfacial heating antibacterial property graphene-based material polypyrrole

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Scaled-up 2D solid-state laser array

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Optics Letters 2025年第8期50卷 2679-2682页

作者： Zhang, Nihui Shan, Zhenjiao Meng, Fansheng Xin, Di Wang, Hai Fu, Ting Qi, Aiyi Qu, Hongwei Zhou, Xuyan Zheng, Wanhua Zhang, Hongbo The Laboratory of Solid State Optoelectronics Information Technology Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China The Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing101408 China The School of Optoelectronics University of Chinese Academy of Sciences Beijing101408 China The School of Physics and Physical Engineering Qufu Normal University Jining273165 China The Weifang Academy of Advanced Opto-Electronic Circuits Weifang261000 China The State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China

The inherent trade-off between high-power and high beam quality has long been a critical technological challenge for high-power vertical-cavity surface-emitting lasers (VCSELs), fundamentally limiting their direct application, especially in remote large area irradiation and detection. Here, a compact and efficient two-dimensional (2D) laser array based on a vertical-cavity surface-emitting laser (VCSEL) array is proposed and demonstrated. By employing a highly doped Nd:YVO4 crystal and a specialized cavity to compensate thermal lensing effect, the laser array achieves a 1 μm wavelength, 4.7mJ pulse energy, 52% optical-tooptical (O-O) conversion efficiency, and a brightness of 1.27 kW cm-2 sr-1, which is three orders higher than that of the 808nm VCSEL array (5.9W cm-2 sr-1). The beam quality factors (M2) of individual emitters were 1.41 and 1.48 in the X and Y directions, respectively. Additionally, the laser power scales with the array size, demonstrating the potential for innovative photonics applications. © 2025 Optica Publishing Group.

关键词： Surface emitting lasers

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Batch growth of wafer-scale nanocrystalline NbSe_(2)film for surface-enhanced Raman spectroscopy

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National science Open 2025年第2期4卷 219-232页

作者： Huihui Lin Yiwen Li Yuxin Li Meng-Xuan Li Luyan Wu Zhaolong Chen Jing Li Institute of Sustainability for Chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and Research(A*STAR)Singapore 627833Singapore National Laboratory of Solid State Microstructures School of PhysicsNanjing UniversityNanjing 210093China State Key Laboratory of Nuclear Physics and Technology Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191China State Key Laboratory of Flexible Electronics(LoFE) Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials(IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)School of Materials Science and EngineeringNanjing University of Posts and TelecommunicationsNanjing 210023China Guangdong Provincial Key Laboratory of Nano-Micro Materials Research School of Advanced MaterialsPeking University Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China

Noble metal-based surface-enhanced Raman spectroscopy(SERS)has emerged as an ultrasensitive technique capable of detecting single molecules through their unique vibrational ***,achieving robust SERS nano-materials that combine significant enhancement factors,scalable reproducibility,and superior chemical stability remains a significant *** present an oxygen-free vapor deposition technique for wafer-scale fabrication of nanocrystalline NbSe_(2)(NC-NbSe_(2))films on SiO2/Si substrates,which is compatible with batch *** NC-NbSe_(2)films exhibit remarkable chemical stability across both crystalline domains(average size~8.1 nm)and grain *** stability,combined with enhanced surface adsorption and a high density of states near the Fermi level,enables superior SERS *** 6G detection demonstrates a sensitivity of 1×10^(-10)M,comparable to noble metal-based SERS ***,the NC-NbSe_(2)film maintains stable SERS signals under harsh thermal and chemical *** scalable approach enables the creation of uniform,reproducible SERS atomic thin film,advancing applications in microelectronics and sensing technologies.

关键词： NbSe_(2) metallic transition-metal dichalcogenides surface-enhanced Raman scattering(SERS) wafer-scale growth molecular sensing

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Surface Ligand Evolution:Sulfur-Directed Covalent Bonding of PPh_(3) on Pd_(4)S with Improved Semi-hydrogenation of Terminal Alkynes

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Precision Chemistry 2024年第5期2卷 200-207页

作者： Wentong Jing Shiguang Mo Weijie Zhang Wenting Zhou Kunlong Liu Jie Wei Ruixuan Qin Nanfeng Zheng New Cornerstone Science Laboratory State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy Materialsand National&Local Joint Engineering Research Center of Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China China Resources Cement Technology R&D(Guangxi)Co Ltd. Nanning 530008China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361102China

Surface modification of metallic nanocatalysts with organic ligands has emerged as an effective strategy to enhance catalytic selectivity,although offten at the expense of catalytic *** this study,we demonstrate a compelling approach by surface modifying Pd2S nanocrystals with PPhz ligands,resulting in a catalyst with excellent catalytic activity and durable selectivity for the semi-hydrogenation of terminal *** and theoretical investigations reveal that the presence of S sites on the Pd surface directs PPh_(3) ligands to preferentially form covalent bonds with S,creating distinctive surface S=PPh_(3) *** configuration induces a partial positive charge on Pd,facilitating hydrogen transfer and thus promoting catalytic ***,the covalent bond between the ligand and catalyst surface forms a robust network,ensuring ligand stability and increasing the hydrogenation energy barrier of ***,the Pd_(4)S@PPhz catalyst exhibits an improved catalytic selectivity with durability in terminal alkyne *** study introduces an effective strategy for designing selective hydrogenation catalysts with an enhanced performance.

关键词： Pd nanocatalysts surface modification selective hydrogenation catalytic stability alkyne semi-hydrogenation

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Thermally responsive ionic transport system reinforced by aligned functional carbon nanotubes backbone

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Chinese Chemical Letters 2023年第7期34卷 439-443页

作者： Lejian Yu Miao Wang Xipeng Li Xu Hou State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China The Higher Educational Key Laboratory for Biomedical Engineering of Fujian Province Research Center of Biomedical Engineering of XiamenDepartment of BiomaterialsCollege of MaterialsXiamen UniversityXiamen 361005China Research Institute for Biomimetics and Soft Matter Fujian Provincial Key Laboratory for Soft Functional Materials ResearchJiujiang Research InstituteCollege of Physical Science and TechnologyXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China

Ion transport plays an important role in energy conversion, biosensors, and a variety of biological processes. Carbon nanotubes, especially for the carbon nanotubes arrays with controlled vertically aligned structures, have displayed great potential as a promising material for regulating ion transport behaviors in the applications of the nanofluidic devices and osmotic energy conversion. Herein, we demonstrate the thermo-controlled ion transport system through the vertically aligned multiwall carbon nanotubes arrays membrane modified by the thermo-responsive hydrogel in a simple and reliable way. The functional carbon nanotubes backbone with the inherent surface charge and interstitial channels structure renders the system improved ion transport behaviors and well controlled switching property by thermo. Based on the integrated properties, the energy output from osmotic power in this system could be regulated by the reversible temperature switches. Moreover, it can realize a higher osmotic energy conversion property regulated by the thermos, which may extend the practical application in the future. The system that combines intelligent response with controlled ion transport behaviors and potential osmotic energy utilizations presents a valuable paradigm for the use of carbon nanotubes and hydrogel composite materials and provides a promising way for applications of nanofluidic devices.

关键词： Carbon nanotubes arrays Ion transport system Interstitial channels Thermo-controlled Osmotic energy

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Bioinspired nanofluidic iontronics for brain-like computing

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Nano Research 2024年第2期17卷 503-514页

作者： Lejian Yu Xipeng Li Chunyi Luo Zhenkang Lei Yilan Wang Yaqi Hou Miao Wang Xu Hou State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Institute of Artificial Intelligence Xiamen UniversityXiamen 361005China Department of Physics Research Institute for Biomimetics and Soft MatterFujian Provincial Key Laboratory for Soft Functional Materials ResearchJiujiang Research InstituteCollege of Physical Science and TechnologyXiamen UniversityXiamen 361005China The Higher Educational Key Laboratory for Biomedical Engineering of Fujian Province Department of BiomaterialsResearch Center of Biomedical Engineering of XiamenCollege of MaterialsXiamen UniversityXiamen 361005China The Institute of Flexible Electronics(IFE Future Technologies)Xiamen UniversityXiamen 361005China Binzhou Institute of Technology Binzhou 256600China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361102China Engineering Research Center of Electrochemical Technologies of Ministry of Education Xiamen UniversityXiamen 361005China

The human brain performs computations via a highly interconnected network of *** inspiration from the information delivery and processing mechanism of the human brain in central nervous systems,bioinspired nanofluidic iontronics has been proposed and gradually engineered to overcome the limitations of the conventional electron-based von Neumann architecture,which shows the promising potential to enable efficient brain-like *** and tunable nanofluidic ion transport behaviors and spatial confinement show promising controllability of charge carriers,and a wide range of structural and chemical modification paves new ways for realizing brain-like ***,a comprehensive framework of mechanisms and design strategy is summarized to enable the rational design of nanofluidic systems and facilitate the further development of bioinspired nanofluidic *** review provides recent advances and prospects of the bioinspired nanofluidic iontronics,including ion-based brain computing,comprehension of intrinsic mechanisms,design of artificial nanochannels,and the latest artificial neuromorphic functions ***,the challenges and opportunities of bioinspired nanofluidic iontronics in the pioneering and interdisciplinary research fields are proposed,including brain–computer interfaces and artificial neurons.

关键词： human brain ion transport nanofluidics brain-like computing memristive effect

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Flexoelectric-induced photovoltaic effects and tunable photocurrents in flexible LaFeO_(3) epitaxial heterostructures

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Journal of Materiomics 2022年第2期8卷 281-287页

作者： Zhizheng Jiang Zhiyu Xu Zhongnan Xi Yihao Yang Ming Wu Yuke Li Xiang Li Qianying Wang Chen Li Di Wu Zheng Wen College of Physics and Center for Marine Observation and Communications Qingdao UniversityQingdao266071China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsAnd Department of Materials Science and EngineeringNanjing UniversityNanjing210093China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anShannxi710049China

By engineering strain gradients in dielectrics,the flexoelectric effect can be created,which yields interesting physical properties via electromechanical ***,we report flexoelectric-induced photovoltaic effects in centrosymmetric LaFeO_(3) thin-film heterostructures grown on flexible mica sub-strates,in which partial relaxation of lattice-mismatch strain against LaAlO_(3) stretching layers results in giant strain gradients and pronounced electrical *** flexoelectric polarization modulates band alignment and leads to significant photovoltaic effects with a short-circuit current density of~0.4 mA/cm^(2) and an open circuit voltage of~-0.45 V in Pt/LaFeO_(3)/LaNiO_(3) *** addition,by con-cavely/convexly bending the mica substrate,mechanical strain gradients give rise to bi-directionally tunable photocurrents,in which continuously change of short-circuit current density with a magni-tude of~100% and good reproducibility in repetitive bending operations are observed in the Pt/LaFeO_(3)/LaNiO_(3) *** present work demonstrates an approach to design self-powered photoelectric de-vices with an electromechanical degree of freedom based on the flexoelectric effect in flexible thin-film heterostructures.

关键词： Flexoelectric effect Photovoltaic effect Strain gradient Flexible electronics Epitaxial heterostructures

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Relationship between orbital moment anisotropy, magnetocrystalline anisotropy, and Dzyaloshinskii-Moriya interaction in W/Co/Pt trilayers

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Physical Review B 2024年第18期110卷 184401页

作者： Zhendong Chi Yong-Chang Lau Vanessa Li Zhang Goro Shibata Shoya Sakamoto Yosuke Nonaka Keisuke Ikeda Yuxuan Wan Masahiro Suzuki Masashi Kawaguchi Masako Suzuki-Sakamaki Kenta Amemiya Naomi Kawamura Masaichiro Mizumaki Motohiro Suzuki Hyunsoo Yang Masamitsu Hayashi Atsushi Fujimori Department of Physics Tsukuba Ibaraki 305-0047 Japan School of Physics and Technology Materials Sciences Research Center Institute for Solid State Physics Institute of Materials Structure Science Graduate School of Science and Technology Gunma University Kiryu Gunma 376-8515 Japan (JASRI) Sayo 679-5198 Japan Department of Electrical and Computer Engineering Department of Physics and Center for Quantum Science and Technology

We have studied the Co layer thickness dependences of magnetocrystalline anisotropy (MCA), Dzyaloshinskii-Moriya interaction (DMI), and orbital moment anisotropy (OMA) in W/Co/Pt trilayers, in order to clarify their correlations with each other. We find that the MCA favors magnetization along the film normal and monotonically increases with decreasing effective magnetic layer thickness (teff). The magnitude of the Dzyaloshinskii-Moriya exchange constant (|D|) increases with decreasing teff until teff∼1 nm, below which |D| decreases. The MCA and |D| scale with 1/teff for teff larger than ∼1 nm, indicating an interfacial origin. The increase of MCA with decreasing teff continues below teff∼ 1 nm, but with a slower rate. To clarify the cause of the teff dependences of MCA and DMI, the OMA of Co in W/Co/Pt trilayers is studied using x-ray magnetic circular dichroism. We find nonzero OMA when teff is smaller than ∼0.8 nm. The OMA increases with decreasing teff more rapidly than what is expected from the MCA, indicating that factors other than OMA contribute to the MCA at small teff. The teff dependence of the OMA also suggests that |D| at teff smaller than ∼1 nm is not related to the OMA at the interface. We propose that the growth of Co on W results in a strain and/or texture that reduces the interfacial DMI, and, to some extent, MCA at small teff.

关键词： Dzyaloshinskii-Moriya interaction Magnetic anisotropy Multilayer thin films X-ray absorption spectroscopy X-ray magnetic circular dichroism

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