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Phonon Polariton Dispersion in Metal-Doped Nanocomposite Superlattice System

Journal of Optical Communications 2023年第2期44卷 237-242页

作者： Krishnamurthy, R. Revathy, V. Wilson, K. S. Joseph Taya, Sofyan A. Amiri, I.S. Department of Electronics and Communication Engineering Sri Vasavi Engineering College Andhra Pradesh Tadepalligudem India Department of Physics Sethu Institute of Technology Tamilnadu Kariapatti India Karumathur Tamilnadu Madurai625 514 India Physics Department Islamic University of Gaza Gaza Palestine Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam

Copper nanoparticles (Cu) anchored lithium niobate (LiNbO3) nanostructures were prepared by a simple hydrothermal technique. The fine and sparse Cu nanoparticles were homogeneously dispersed over the surface of LiNbO3. An effectual anchoring of Cu was evidenced from the acquired reflection planes in diffraction analysis, which clearly indicate the face-centered cubic structure of Cu. The UV-Visible spectrum of LiNbO3 and Cu/LiNbO3 nanocomposites were also studied. When the Cu nanoparticles were doped with LiNbO3/LiTaO3 superlattice system, the change in the dispersion relation was observed theoretically. The characteristics of the polariton dispersion variation with filling factor of Cu nanoparticles concentration were investigated systematically. The importance of the polariton modes in communication sector was analyzed and the occurrence of new modes on the polaritonic gap, where the propagation of the electromagnetic wave is forbidden, were obtained in the system due to the presence of copper nanoparticles. © 2019 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Polariton

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Mapping the antiparallel aligned domain rotation by microwave excitation

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Chinese Physics B 2024年第9期33卷 599-605页

作者： Jing Zhang Yuanzhi Cui Xiaoyu Wang Chuang Wang Mengchen Liu Jie Xu Kai Li Yunhe Zhao Zhenyan Lu Lining Pan Chendong Jin Qingfang Liu Jianbo Wang Derang Cao College of Physics Qingdao UniversityQingdao 266071China National Demonstration Center for Experimental Applied Physics Education Qingdao UniversityQingdao 266071China SKLSM Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Chemistry Chemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin 150040China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and ElectronicsHunan University of Science and TechnologyXiangtan 411201China CAS Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Key Laboratory of Optic-Electronic Information and Materials of Hebei Province Research Center for Computational PhysicsCollege of Physics Science and TechnologyHebei UniversityBaoding 071002China Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education Lanzhou UniversityLanzhou 730000China Key Laboratory of Special Functional Materials and Structural Design Ministry of EducationLanzhou UniversityLanzhou 730000China

The evolution process of magnetic domains in response to external fields is crucial for the modern understanding and application of *** this study,we investigated the domain rotation in stripe domain films of varying thicknesses by examining their response to microwave excitation in four different *** resonance spectra indicate that the rotation field of stripe domain film under an applied magnetic field approaches the field where the resonance mode of sample *** saturation field of the stripe domain film corresponds to the field where the resonance mode disappears when measured in the stripe direction parallel to the microwave magnetic *** results are reproducible and consistent with micromagnetic simulations,providing additional approaches and techniques for comprehending the microscopic mechanisms of magnetic domains and characterizing their rotation.

关键词： stripe domain magnetic film microwave excitation micromagnetic simulation

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利用电荷转移工程提高红色SrLa(Sc,Ga)O_(4):Ce^(3+)荧光粉的热稳定性

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science China Materials 2023年第5期66卷 1989-1996页

作者：杨至雨赵逸飞 Jumpei Ueda Maxim S.Molokeev 尚蒙蒙夏志国 State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Centre of Special Optical Fibre Materials and DevicesSchool of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510641China Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong 999077China Graduate School of Advanced Science and Technology Japan Advanced Institute of Science and Technology(JAIST)NomiIshikawa 923–1292Japan Laboratory of Crystal Physics Kirensky Institute of PhysicsFederal Research Center KSC SB RASKrasnoyarsk 660036Russia Department of Engineering Physics and Radioelectronic Siberian Federal UniversityKrasnoyarsk660041Russia Research and Development Department Kemerovo State UniversityKemerovo 650000Russia Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China

可被蓝光激发的高热稳定性红色荧光粉是制作高性能白光二极管(WLED)的关键材料.研究发现,Ce^(3+)掺杂的SrLaScO_(4)(SLO:Ce^(3+))荧光粉在440 nm激发下呈现峰值为640 nm的反常宽带红光发射.光谱学和结构分析证实Ce^(3+)离子在SLO中进入[... 详细信息

可被蓝光激发的高热稳定性红色荧光粉是制作高性能白光二极管(WLED)的关键材料.研究发现,Ce^(3+)掺杂的SrLaScO_(4)(SLO:Ce^(3+))荧光粉在440 nm激发下呈现峰值为640 nm的反常宽带红光发射.光谱学和结构分析证实Ce^(3+)离子在SLO中进入[LaO_(8)]多面体,产生强的晶体场劈裂和较大的Stokes位移,实现了比Eu^(2+)更低能量的红光发射.我们还设计并揭示了一种电荷转移相互作用的策略:在Sc^(3+)位置引入电负性较大的Ga^(3+),Ga^(3+)可以吸引更多邻位配合基团的电荷,以减少导带底部的电子占用而扩大带隙.Sc/Ga取代有效地抑制了热激活电离过程,使SrLa(Sc,Ga)O_(4):Ce^(3+)的热稳定性获得了显著提升,即在150℃的发光强度比(相对于20℃)从15%提升至31%.本研究为发现具有良好热稳定性的新型Ce^(3+)掺杂红色荧光粉提供了有效的设计原则.

关键词： Ce^(3+) thermal stability band gap broadband red luminescence

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Coherent enhancement of a frequency comb modulated by a terahertz laser field in high-order harmonic generation

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Physical Review A 2023年第4期108卷 043101-043101页

作者： Yuan-Yuan Wu Chang-Tong Liang Bao-Guang Zhao Peng-Cheng Li Research Center for Advanced Optics and Photoelectronics Department of Physics College of Science Shantou University Shantou Guangdong 515063 China Key Laboratory of Intelligent Manufacturing Technology of MOE Shantou University Shantou Guangdong 515063 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China

We present the coherent enhancement of the frequency comb via high-order harmonic generation (HHG) in a train of infrared laser pulses combined with terahertz (THz) laser fields. The HHG spectra are obtained by solving the three-dimensional time-dependent Schrödinger equation by means of the time-dependent generalized pseudospectral method. We find that the structure of the frequency comb via HHG becomes much smoother and more regular, and the yield of the comb is increased by nearly two orders of magnitude. By analyzing the phase coherence of HHG spectra, we demonstrate that the THz laser fields are responsible for the optimization of the structure and yield of the frequency comb since the constructive phase coherence of the HHG spectra is modulated by the THz field. The physical origin of the constructive phase coherence is thanks to the uniform ionization efficiency induced by the THz laser field for each laser pulse, which greatly improves the synchronization of the harmonic emission. Our finding provides a promising method for the enhancement of the frequency comb via HHG.

关键词： Atomic & molecular processes in external fields High-order harmonic generation Light-matter interaction Ultrafast phenomena

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Overcoming water, sanitation, and hygiene challenges in critical regions of the global community

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Water-Energy Nexus 2024年第1期7卷 277-296页

作者： Bose, Debajyoti Bhattacharya, Riya Kaur, Tanveen Banerjee, Ritesh Bhatia, Tanya Ray, Aritra Batra, Bhavika Mondal, Arnab Ghosh, Paulami Mondal, Surajit AI-Research Centre School of Business Woxsen University Telangana Hyderabad India School of Biotechnology Faculty of Applied Sciences & Biotechnology Shoolini University of Biotechnology & Management Sciences Himachal Pradesh Solan India Institute of Environment and Sustainable Development Banaras Hindu University Uttar Pradesh Varanasi India Department of Allied Health Science School of Health Sciences and Technology University of Petroleum & Energy Studies Uttarakhand Dehradun India Department of Electrical and Electronics Engineering School of Advanced Engineering University of Petroleum & Energy Studies Uttarakhand Dehradun India Delhi New Delhi Hauz Khas India Centre of Excellence in Health Technology Ecosystems & Biodiversity Woxsen University Telangana Hyderabad India Roy J. Carver Department of Biochemistry Biophysics and Molecular Biology Iowa State University of Science and Technology AmesIA United States

This review provides a critical analysis of the global water and sanitation crisis, as well as how community-based approaches have led to innovative water management solutions. Regions of sub-Saharan Africa, south Asia, the Middle East, and island countries have been taken as models to understand mitigating crises related to water, sanitation, and hygiene (WASH) services. Selected WASH cases based on specific inclusion and exclusion criteria that highlighted finance, sustainability, and community engagement. The review analyses methods through which communities below the poverty line, living in densely populated areas, war zones, and island countries can foster innovation, and collaborations. © 2024

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Evoking dynamic Fe–Nx active sites through the immobilization of molecular Fe catalysts on N-doped graphene quantum dots for the efficient electroreduction of nitrate to ammonia

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Journal of Materials Chemistry A 2024年第33期12卷 22070-22081页

作者： Mia Rinawati Yen-Shuo Chiu Ling-Yu Chang Chia-Yu Chang Wei-Nien Su Ni Luh Wulan Septiani Brian Yuliarto Wei-Hsiang Huang Jeng-Lung Chen Min-Hsin Yeh Department of Chemical Engineering National Taiwan University of Science and Technology Taipei 10607 Taiwan Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei Taiwan Sustainable Electrochemical Energy Development Center National Taiwan University of Science and Technology Taipei 10607 Taiwan Research Center for Nanotechnology Systems National Research and Innovation Agency (BRIN) Kawasan Puspiptek Serpong South Tangerang 15314 Indonesia Advanced Functional Materials Laboratory Department of Engineering Physics Institute of Technology Bandung (ITB) Bandung Indonesia National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan

The excessive energy demand of the conventional Haber–Bosch process for ammonia (NH3) generation, coupled with the disruptive effects of nitrate (NO3−) pollution on the global nitrogen cycle, has made the electrocata...

The excessive energy demand of the conventional Haber–Bosch process for ammonia (NH₃) generation, coupled with the disruptive effects of nitrate (NO₃⁻) pollution on the global nitrogen cycle, has made the electrocatalytic nitrate reduction reaction (NO₃⁻RR) an essential exit strategy for sustainable NH₃ synthesis. However, the intricate multi-step proton and electron transfer process posed a great challenge in achieving high-efficiency electrocatalysts. In this study, we report a selective and highly active NO₃⁻RR electrocatalyst featuring molecular M–N_x sites derived from the immobilization of Fe ions within N-doped graphene quantum dots (NGQDs). We demonstrated that the formation of molecular Fe–N_x coordination activated the NO₃⁻RR of NGQDs-Fe, despite the initial inactivity of NGQDs. In situ Raman analysis revealed that those Fe–N_x sites served as favourable adsorption sites for *NO₃. Such catalyst achieved an FE of 93% and a yield rate of 15.41 mmol h⁻¹ cm⁻² for NH₃ at −0.8 V (vs. RHE) in an alkaline medium. These findings revealed the preferential sequential 2e⁻ and 6e⁻ transfer pathways over the direct 8e⁻ pathway in the NO₃⁻RR, which provides new mechanistic insights into the nitrate reduction reaction.

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Segmentation and Multi-facet Classification of Individual Logs in Wooden Piles 18th

Segmentation and Multi-facet Classification of Individual Lo...

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18th International Conference on Computer Aided Systems Theory, EUROCAST 2022

作者： Praschl, Christoph Auersperg-Castell, Philipp Forster-Heinlein, Brigitte Zwettler, Gerald Adam Research Group Advanced Information Systems and Technology Research and Development Department University of Applied Sciences Upper Austria Hagenberg Austria Department of Software Engineering School of Informatics Communications and Media University of Applied Sciences Upper Austria Hagenberg Austria Bluedynamics Auersperg-Castell KG Kritzing 31 Freinberg Austria Faculty of Computer Science and Mathematics University of Passau Passau Germany

ISBN: (纸本)9783031253119

The inspection of products and assessment of quality is connected with high costs and time effort in many industrial domains. This also applies to the forestry industry. Utilizing state-of-the-art deep learning models allows automizing the analysis of wooden piles in a vision-based manner. In this work, a parallel two-step approach is presented for the segmentation and multi-facet classification of individual logs, according to the wood type and quality. The present approach is based on a preliminary log localization step and like this allows determining the quality, volume and also the value of individual logs, respectively the whole wooden pile. Using a YOLOv4 model for wood species classification for douglas firs, pines and larches results in an accuracy of 74.53%, while a quality classification model for spruce logs reaches 86.58%. In addition to that, the trained U-NET segmentation model reaches an accuracy of 93%. In the future, the underlying data set and models will be further improved and integrated to a mobile application for the on site analysis of wooden piles by foresters. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Deep learning

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Internal moisture barrier layer for improving high-humidity reliability of miniature light emitting diode die without encapsulation

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Optics Express 2023年第20期31卷 33732-33740页

作者： Hsu, Chia-Hsun Luo, Hai-Long Li, Shi-Tao Bian, Fu-Qiang Chen, Ya-Zhen Peng, G.A.O. Wu, Wan-Yu Wuu, Dong-Sing Lai, Feng-Min Lien, Shui-Yang Zhu, Wen-Zhang Xiamen Key Laboratory of Development Application for Advanced Semiconductor CoatingTechnology School of Opto-Electronic and Communication Engineering Xiamen University of Technology Fujian Xiamen361024 China Xiamen Silan Advanced Compound Semiconductor Co. Ltd. Fujian Xiamen361026 China Fujian Institute of Research the Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China Department of Materials Science and Engineering National United University Miaoli36063 Taiwan Department of Applied Materials and Optoelectronic Engineering National Chi Nan University Nantou54561 Taiwan Department of Biomedical Engineering Da-Yeh University Changhua51591 Taiwan

Atomic layer deposited Al2O3 films are incorporated into miniature light emitting diodes (mini-LEDs) as an internal moisture barrier layer. The experimental results show that the water vapor transmission rate reaches ≤10−4 g/m2/day when the Al2O3 thickness is ≥40 nm. The mini-LED with a 40 nm-thick Al2O3 layer shows negligible degradation after 1000 h of 85°C/85% relative humidity testing, whereas the device without an Al2O3 layer fails after only 500 h due to delamination occurring at the GaN surface. Current-voltage characteristics of the device without an Al2O3 moisture barrier layer indicate an increase in series resistance and ideality factor. This study provides a simple, light-weighting method to have a satisfactory encapsulation function for miniature LEDs. © 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： III-V semiconductors

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Complete Characterizations of Intermediate and Final State Wave Functions with Photoionization of Polarized Rb

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Physical Review Letters 2025年第12期134卷 123204-123204页

作者： Huanyu Ma Linxuan Zhang Xincheng Wang Zhihan Zou Rujin Lv Zhenjie Shen Ahai Chen Matthias Weidemüller Kiyoshi Ueda Center for Transformative Science and School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China Graduate School China Academy of Engineering Physics Beijing 100193 China Physikalisches Institut Universität Heidelberg Im Neuenheimer Feld 226 69120 Heidelberg Germany

The amplitude and phase of a photoionization channel provide deep insights into the nature of ionization dynamics. Here, we propose a novel experimental approach to retrieve these parameters from the photoelectron momentum distribution (PMD), where a 400 nm femtosecond laser is used to ionize polarized Rb atoms prepared in the 5p state. The magnetic quantum numbers of polarized atoms are well controlled by breaking down the symmetry of the cooling laser in a magneto-optical trap reaction microscope. From the tilt angle of the PMD and the interference structure of εs and εd ionization channels, we are able to extract their relative amplitude and phase shift, in good agreement with ab initio calculations. This exhibits a benchmark one-photon single ionization study of the hydrogen-like atom, providing a complete measurement with full characterizations of intermediate and final state wave functions.

关键词： Wave functions

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Unconventional excitonic states with phonon sidebands in layered silicon diphosphide (Jun, 10.1038/s41563-022-01285-3, 2022)

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NATURE MATERIALS 2022年第10期21卷 1212-1212页

作者： Zhou, Ling Huang, Junwei Windgaetter, Lukas Ong, Chin Shen Zhao, Xiaoxu Zhang, Caorong Tang, Ming Li, Zeya Qiu, Caiyu Latini, Simone Lu, Yangfan Wu, Di Gou, Huiyang Wee, Andrew T. S. Hosono, Hideo Louie, Steven G. Tang, Peizhe Rubio, Angel Yuan, Hongtao National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing China Max Planck Institute for the Structure and Dynamics of Matter Center for Free Electron Laser Science Hamburg Germany Department of Physics University of California Berkeley CA USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA USA School of Materials Science and Engineering Peking University Beijing China Materials Research Center for Element Strategy Tokyo Institute of Technology Yokohama Japan College of Materials Science and Engineering National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing China Center for High Pressure Science and Technology Advanced Research Beijing China Department of Physics National University of Singapore Singapore Singapore School of Materials Science and Engineering Beihang University Beijing China Center for Computational Quantum Physics Simons Foundation Flatiron Institute New York NY USA

Complex correlated states emerging from many-body interactions between quasiparticles (electrons, excitons and phonons) are at the core of condensed matter physics and material science. In low-dimensional materials, quantum confinement affects the electronic, and subsequently, optical properties for these correlated states. Here, by combining photoluminescence, optical reflection measurements and ab initio theoretical calculations, we demonstrate an unconventional excitonic state and its bound phonon sideband in layered silicon diphosphide (SiP2), where the bound electron–hole pair is composed of electrons confined within one-dimensional phosphorus–phosphorus chains and holes extended in two-dimensional SiP2 layers. The excitonic state and emergent phonon sideband show linear dichroism and large energy redshifts with increasing temperature. Our ab initio many-body calculations confirm that the observed phonon sideband results from the correlated interaction between excitons and optical phonons. With these results, we propose layered SiP2 as a platform for the study of excitonic physics and many-particle effects.

关键词： Electronic properties and materials Electronic structure Optical spectroscopy Two-dimensional materials

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