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Nanometer displacement measurement based on metrological self-mixing grating interferometer traceable to the pitch standard of one-dimension chromium self-traceable grating

arXiv

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arXiv 2023年

作者： Gu, Zhenjie Xie, Zhangning Chang, Zhikun Xiao, Guangxu Yin, Zhijun Lin, Zichao Tong, Zhou Lei, Lihua Jin, Tao Xue, Dongbai Deng, Xiao Chen, Xinbin Li, Tongbao Institute of Precision Optical Engineering Tongji University Shanghai200092 China MOE Key Laboratory of Advanced Micro-Structured Materials Tongji University Shanghai200092 China Shanghai Frontiers Science Center of Digital Optics Tongji University Shanghai200092 China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications Tongji University Shanghai200092 China School of Physics Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Measurement and Testing Technology Shanghai200093 China University of Shanghai for Science and Technology Shanghai200093 China

Traceability of precision instrument and measuring method is the core issue in metrology science. In the field of nanometer length measurement, the laser interferometers are usually used to trace the measurement value to the laser wavelength, but the laser wavelength is sensitive to the environment disturbance. Chromium self-traceable grating is an ideal nanometer length reference grating with pitch traceability, fabricated by the atomic lithography technique. The new nanometer length traceability chain can be established based on the pitch traceability of chromium self-traceable grating, which is often used to calibrate the systematic error of the atomic force microscope. In this paper, the metrological self-mixing grating interferometer based on the chromium self-traceable grating (SMGI-Cr) is firstly established, whose interfere phase is traceable to the pitch of the chromium self-traceable grating directly and traceable to the chromium atomic transition frequency of energy level 7S3 →7P4 indirectly. The nanometer displacement measurement is also achieved by the SMGI-Cr. The measurement error is no more than 0.2366%, compared to a commercial interferometer. © 2023, CC BY.

关键词： Displacement measurement

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Chromium Self-Traceable Length Standard: Investigating Geometry and Diffraction for Length Traceability Chain

arXiv

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arXiv 2023年

作者： Lin, Zichao Yao, Yulin Xie, Zhangning Xue, Dongbai Zhou, Tong Tang, Zhaohui Lei, Lihua Jin, Tao Dun, Xiong Deng, Xiao Cheng, Xinbin Li, Tongbao Institute of Precision Optical Engineering Tongji University Shanghai200092 China MOE Key Laboratory of Advanced Micro-Structured Materials Tongji University Shanghai200092 China Shanghai Frontiers Science Center of Digital Optics Tongji University Shanghai200092 China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications Tongji University Shanghai200092 China School of Physics Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Measurement and Testing Technology Shanghai201203 China University of Shanghai for Science and Technology Shanghai200093 China

Natural constant-based metrology methods offer an effective approach to achieving traceability in nanometric measurements. The Cr grating, fabricated by atom lithography and featuring a pitch of d=212.7705±0.0049 nm traceable to the Cr transition frequency 7S3→7P40, demonstrates potential as a self-traceable length standard in nano-length metrology by grating interferometer. This research aims to analyze and engineer the diffraction characteristics that enhance the Cr grating as a self-traceable length standard within the length traceability chain based on the Cr transition frequency. Accordingly, we investigate the geometric morphology and diffraction characteristics of the Cr grating, analyzes the influence of the grating's polarization-sensitive characteristics on the Littrow configuration grating interferometer, and establishes the criteria for Cr grating fabrication. Experimentally, we fabricate an expanded Cr grating by scanning atom lithography, characterize its diffraction performance, and conduct preliminary verification of length measurement in a self-traceable grating interferometer. This work adheres to the international trend of flattened metrology development, offering a valuable reference for advancing subsequent metrological technologies throughout the new traceability chain. Copyright © 2023, The Authors. All rights reserved.

关键词： Diffraction

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Design rules of pseudocapacitive electrode materials:ion adsorption,diffusion,and electron transmission over prototype TiO_(2)

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science China materials 2022年第2期65卷 391-399页

作者： Lijing Wang Xiaolong Yao Da Chen Jin Wang Zhenzhou Zhang Jieyu Liu Tianquan Lin Wei-Hua Wang Zhanglian Hong Fuqiang Huang Weichao Wang Integrated Circuits and Smart System Lab(Shenzhen) Renewable Energy Conversion and Storage CenterTianjin Key Laboratory of Photo-Electronic Thin Film Device and TechnologyCollege of Electronic Information and Optical EngineeringNankai UniversityTianjin 300071China Key Laboratory of Civil Aviation Thermal Hazards Prevention and Emergency Response Civil Aviation University of ChinaTianjin 300300China CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

The development of a high-performing pseudocapacitor requires a comprehensive understanding of electrode materials from the aspects of electron transfer and electrolyte ion adsorption and ***,these factors are considered over the prototype TiO_(2),and a high pseudocapacitance is achieved via the introduction of various defects,i.e.,oxygen defect(V_(O))and co-doped defect(V_(O)+N_(O)).The study is based on joint explorations of first-principle calculations and the transfer matrix *** to pristine TiO_(2)(300 F g^(-1)),defective TiO_(2) produces pseudocapacitance as high as 1700 F g^(-1).Moreover,defects induce small barriers for electron transmission caused by surface band *** climbing image nudged elastic band diffusion of H ions displays a much higher barrier in TiO_(2)-V_(O) than in TiO_(2)-V_(O)+N_(O).Such a result indicates easy H diffusion in the co-doped *** work provides insights into the adsorption and diffusion of electrolyte ions and the influence of defects on electron *** results are also significant for the design and optimization of electrode materials for the next generation of supercapacitors.

关键词： pseudocapacitance charge storage ion diffusion electron transmission

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Research on mechanism of improving the cut-off frequency of terahertz Schottky diodes in air-bridge structures by structure optimization

Research on mechanism of improving the cut-off frequency of ...

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International Conference on (ICEPT) Electronic Packaging technology

作者： Yuebo Liu Ke Zhang QiuLing Qiu Xi Luo Xiaoting Chen Ruihan Liu Honghui Liu Reliability Physics and Application Technology of Electronic Component Key Laboratory China Electronic Product Reliability and Environmental Testing Research Institute (CEPREI) Guangzhou China Reliability Research and Analysis Centre China Electronic Product Reliability and Environmental Testing Research Institute (CEPREI) Guangzhou China Components and materials sector data center China Electronic Product Reliability and Environmental Testing Research Institute (CEPREI) Guangzhou China State Key Laboratory of High Power Semiconductor Lasers Changchun University of Science and Technology Changchun China School of Materials Science and Engineering Xiamen University of Technology Xiamen China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China Testing technology Research Center China Electronic Product Reliability and Environmental Testing Research Institute (CEPREI) Guangzhou China

ISBN: (数字)9798350353808

ISBN: (纸本)9798350353815

In the realm of air bridge structures for Schottky barrier diodes operating in the millimetre wave or terahertz band, cut-off frequency serves as a critical metric for gauging device performance. This research holds significance in guiding device design and enhancing performance by refining the device's architecture, thereby reducing capacitance values and elevating cut-off frequency without adding complexity to the manufacturing process. In this study, we investigate how the shape and spacing of mesas or pads impact device capacitance through electrostatic field simulations, leveraging Maxwell's capacitance matrix and mutual capacitance matrix. Simulation analysis and experimental validation reveal that devices with circular Schottky contact electrode pads and minimal pad area exhibit lower capacitance values. Furthermore, we observe that the capacitance of the device initially decreases and then increases with the length of the air bridge. An optimal air bridge length exists that minimizes the capacitance of the device. This research offers valuable insights for refining these devices.

关键词： Electrodes Performance evaluation Schottky diodes Shape Atmospheric modeling Cutoff frequency Schottky barriers

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Efficient Water Evaporation Using Black Silicon

ACS Sustainable Resource Management

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ACS Sustainable Resource Management 2025年第2期2卷 316-321页

作者： Yoshiaki Nishijima Hiroyoshi Nishijima Makoto Ohashi Tomas Katkus Saulius Juodkazis Department of Electrical and Computer Engineering Graduate School of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan；Precursory Research for Embryonic Science and Technology (PRESTO) Japan Science and Technology Agency (JST) 7 Gobancho Chiyoda-ku Tokyo 102-0076 Japan；Institute of Advanced Sciences Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan；Institute for Multidisciplinary Sciences Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan；Research Institute for Electronic Science (RIES) Hokkaido University North 20 West 10 Kita-ku Sapporo Hokkaido 001-0020 Japan Hokkaido Obihiro South Commercial High School 36-1 West 21 South 5 Obihiroshi Hokkaido 080-2471 Japan Department of Electrical and Computer Engineering Graduate School of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials School of Science Swinburne University of Technology Hawthorn Victoria 3122 Australia Institute of Advanced Sciences Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan；Optical Sciences Centre Swinburne University of Technology Hawthorn Victoria 3122 Australia；Tokyo Tech World Research Hub Initiative School of Materials and Chemical Technology Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8550 Japan；Laser Research Center Physics Faculty Vilnius University Vilnius 01513 Lithuania

The black silicon (b-Si)─plasma-etched nanostructured surface of crystalline Si─was used as a light absorber due to its extremely low reflectivity (<1%) at the visible-to-near-IR spectral range. Flat Fresnel lenses of 1.47 and 0.36 m2were used to focus light onto b-Si, which was a photothermal absorber. Experiments to distill water were carried out from October 2021 to April 2022 in Obihiro (42°55′N 143°12′E), Hokkaido, Northern Japan. The same b-Si has biocidal properties (antibactericidal, antiviral, and antifungal) due to mechanical nanoscale needles, which complement the water purification when gray water sources are used in applications.

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AdS/CFT correspondence in hyperbolic lattices

arXiv

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arXiv 2023年

作者： Chen, Jingming Chen, Feiyu Yang, Linyun Yang, Yuting Chen, Zihan Wu, Ying Meng, Yan Yan, Bei Xi, Xiang Zhu, Zhenxiao Cheng, Minqi Liu, Gui-Geng Shum, Perry Ping Chen, Hongsheng Cai, Rong-Gen Yang, Run-Qiu Yang, Yihao Gao, Zhen Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China School of Materials Science and Physics China University of Mining and Technology Xuzhou221116 China School of Physics Nanjing University of Science and Technology Nanjing210094 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center College of Information Science and Electronic Engineering ZJU-UIUC Institute Zhejiang University Hangzhou310027 China CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China Center for Joint Quantum Studies Department of Physics School of Science Tianjin University Tianjin300350 China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Southern University of Science and Technology Guangdong Shenzhen China Guangdong Key Laboratory of Integrated Optoelectronics Intellisense Southern University of Science and Technology Shenzhen518055 China

The celebrated anti-de Sitter/conformal field theory (AdS/CFT) correspondence1-3, also known as the gravity/gauge duality, posits a dual relationship between the quantum gravity in an AdS spacetime and the CFT defined on its lower-dimensional boundary. This correspondence not only offers profound insights into the enigmatic nature of quantum gravity but also shows mighty power in addressing strongly-correlated systems. However, despite its importance in contemporary physics, the AdS/CFT correspondence remains a conjecture, and further experimental investigation is highly sought after. Here, we present the first experimental exploration of this conjecture by testing its core corollary: the leading-order effects of a strongly-coupled CFT can be exactly described by a weakly-coupled classical field in a higher-dimensional AdS spacetime. Through measuring the bulk entanglement entropy (BEE) and boundary-boundary correlation function (BBCF) of scalar fields in both conventional type-I and previously overlooked type-II hyperbolic lattices, serving as the discretized regularizations of spatial geometries of pure AdS2+1 spacetime and AdS2+1 black hole, respectively, we experimentally confirm that BEE exhibits a logarithmic scaling with the subsystem size, following the Ryu-Takayanagi (RT) formula, while BBCF showcases an exponential law dependence on the boundary separation, the scaling dimension of which conforms to the Klebanov-Witten (KW) relation, both of which align remarkably well with the established CFT outcomes. This heuristic experimental effort opens a new avenue for in-depth investigations on the gravity/gauge duality and extensive exploration of quantum-gravity-inspired phenomena in classical systems. © 2023, CC BY.

关键词： Gravitation

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Novel Type-I Photosensitizer with Hybridized Local Charge Transfer (Hlct) Characteristic for Efficient Photodynamic Therapy

SSRN

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SSRN 2024年

作者： Wang, Haiyang Chen, Xiaojie Dai, Hui Wang, Wen Lin, Faxu Yan, Wenqing Chi, Zhenguo Yang, Zhiyong Qin, Wei PCFM Lab Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films School of Chemistry Sun Yat-sen University Guangzhou510275 China PCFM Lab School of Materials Science and Engineering Sun Yat-sen University Guangzhou510275 China Medical Research Institute Guangdong Provincial People’s Hospital Guangdong Academy of Medical Sciences Southern Medical University Guangzhou510080 China Guangdong Provincial Key Laboratory of Optical Chemicals Xinhuayue Group Maoming525000 China

Photodynamic therapy (PDT) is a promising option for tumour treatment, due to its non-invasive and spatiotemporal selectivity. However, PDT for tumours still faces many obstacles. The hypoxic environment of solid tumours has become a critical factor limiting the effectiveness of PDT. In recent years, Type I photosensitizers have gained considerable attention for their potential to foster efficient PDT under hypoxic conditions. Unlike type II photosensitizers, which rely on energy transfer mechanisms, type I photosensitizers participate in direct electron transfer with substrates, resulting in the generation of free radicals. Currently, there are relatively few reports regarding purely organic Type I photosensitizers. Herein, we report two compounds, TPABTPA and TPABCHO. Compared to TPABTPA molecules, TPABCHO molecules have a smaller ΔEst and smaller electron cloud overlap areas of HOMO and LOMO, which results in TPABCHO molecules having a stronger ROS generation capacity. TPABTPA and TPABCHO can simultaneously generate singlet oxygen and hydroxyl radicals, exhibiting the characteristics of type I and type II photosensitizers. After being encapsulated in DSPE-PEG2000 copolymers, TPABTPA-NPs and TPABCHO-NPs were able to effectively enter the 4T1 cells. When exposed to light, the nanoparticles induced a significant production of reactive oxygen species (ROS) within the cells, leading to the initiation of apoptotic processes in the 4T1 cells. This study introduces a novel approach to the design and production of innovative organic Type I photosensitizers. © 2024, The Authors. All rights reserved.

关键词： Charge transfer

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Length traceability chain based on chromium atom transition frequency

arXiv

引用

arXiv 2023年

作者： Deng, Xiao Lin, Zichao Dai, Gaoliang Tang, Zhaohui Xie, Zhangning Xiao, Guangxu Yin, Zhijun Lei, Lihua Jin, Tao Xue, Dongbai Gu, Zhenjie Cheng, Xinbin Li, Tongbao Institute of Precision Optical Engineering Tongji University Shanghai200092 China Moe Key Laboratory of Advanced Micro-Structured Materials Tongji University Shanghai200092 China Shanghai Frontiers Science Center of Digital Optics Tongji University Shanghai200092 China Shanghai Prof. Tech. Serv. Platform for Full-Spectrum and High-Perf. Optical Thin Film Devices and Applic. Tongji University Shanghai200092 China School of Physics Science and Engineering Tongji University Shanghai200092 China Physikalisch-Technische Bundesanstalt Braunschweig38116 Germany Shanghai Institute of Measurement and Testing Technology Shanghai201203 China University of Shanghai for Science and Technology Shanghai200093 China

Precise positioning measurement plays an important role in in today's advanced manufacturing industry, and length traceability chain has been optimizing and enriching to fulfill the developing and various precise positioning requirement. In this paper, we propose a new length traceability chain based on chromium atom transition frequency, which is a combining utilization of fundamental physical constant's accuracy and grating interferometer's environmental robustness. The self-traceable grating pitch standard, the self-traceable angle standard and the self-traceable grating interferometer are promising to improve the measurement accuracy, consistency and self-calibration ability in situ for precise positioning. Copyright © 2023, The Authors. All rights reserved.

关键词： Chromium

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Origin of the injection-dependent emission blueshift and linewidth broadening of III-nitride light-emitting diodes

arXiv

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arXiv 2022年

作者： Pant, Nick Li, Xuefeng DeJong, Elizabeth Feezell, Daniel Armitage, Rob Kioupakis, Emmanouil Applied Physics Program University of Michigan Ann ArborMI48109 United States Department of Materials Science & Engineering University of Michigan Ann ArborMI48109 United States Center for High Technology Materials University of New Mexico AlbuquerqueNM87106 United States Lumileds LLC San JoseCA95131 United States

III-nitride light-emitting diodes (LEDs) exhibit an injection-dependent emission blueshift and linewidth broadening that is severely detrimental to their color purity. Using first-principles multi-scale modelling that accurately captures the competition between polarization-charge screening, phase-space filling, and many-body plasma renormalization, we explain the current-dependent spectral characteristics of polar III-nitride LEDs fabricated with state-of-the-art quantum wells. Our analysis uncovers a fundamental connection between carrier dynamics and the injection-dependent spectral characteristics of light-emitting materials. For example, polar III-nitride LEDs offer poor control over their injection-dependent color purity due to their poor hole transport and slow carrier recombination dynamics, which forces them to operate at or near degenerate carrier densities. Designs that accelerate carrier recombination and transport and reduce the carrier density required to operate LEDs at a given current density lessen their injection-dependent wavelength shift and linewidth broadening. Copyright © 2022, The Authors. All rights reserved.

关键词： Carrier concentration

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Three-level all-fiber laser at 915 nm based on polarization-maintaining Nd^3+-doped silica fiber

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Chinese Optics Letters 2020年第1期18卷 40-43页

作者： Yafei Wang Xingyu Li Jiamin Wu Xiulin Peng Jiangkun Cao Changsheng Yang Shanhui Xu Zhongmin Yang Mingying Pen State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesSchool of Materials Science and TechnologySouth China University of TechnologyGuangzhou 510640China Guangdong Engineering Technology Research and Development Center of High-performance Fiber Laser Techniques and Equipments Zhuhai 519031China

Nd3+-doped fiber lasers at around 900 nm based on the 4F3/2→4I9/2 transition have obtained much research attention since they can be used as the laser sources for generating pure blue fiber lasers through the frequency ***,an all-fiber laser at 915 nm was realized by polarization-maintaining Nd3+-doped silica fiber.A net gain per unit length of up to 1.0 dB/cm at 915 nm was obtained from a 4.5 cm fiber,which to our best knowledge is the highest gain coefficient reported in this kind of silica *** optical-to-optical conversion efficiency varies with the active fiber length and the reflectivity of the output fiber Bragg grating(FBG),presenting an optimal value of 5.3%at 5.1 cm fiber length and 70%reflectivity of the low reflection ***,the linear distributed Bragg reflector short cavity was constructed to explore its potential in realizing single-frequency 915 nm fiber *** measurement result of longitudinal-mode properties shows it is still multi-longitudinal mode laser operation with 40 mm laser *** results indicate that the Nd3+-doped silica fiber could be used to realize all-fiber laser at 915 nm,which presents potential to be the seed source of high-power fiber laser.

关键词： fiber laser laser materials neodymium

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