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2021 European Powder Metallurgy Congress and Exhibition, Euro PM 2021

作者： Köhler, Marie Luise Herzog, Simone Kaletsch, Anke Broeckmann, Christoph Institute for Materials Applications in Mechanical Engineering RWTH Aachen University Germany

ISBN: (纸本)9781899072545

Carbide-rich tool steels are known to be difficult to process by Laser Powder Bed Fusion (LPBF). In order to enhance processability and mechanical properties, alloy development is required. Simultaneously, powder mixtures as feedstock for the LPBF process become increasingly attractive for researchers, as this is a cost-efficient way of alloy development. A high chromium alloyed cold work tool steel, based on conventionally available AISI H13 powder and modified by additions of Cr3C2, Cr and FeCrC powder was processed by LPBF. Different powder particle size distributions were used to characterize their influence on the microstructure of the cold work tool steel. The microstructure is analysed in detail by light optical microscopy, backscattered electron imaging and electron backscatter diffraction. The resulting chemical homogeneity and mechanical properties of the steel are further analysed by optical emission spectroscopy, energy dispersive X-ray spectroscopy and hardness testing. © European Powder Metallurgy Association (EPMA)

关键词： Microstructure

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WSO-Uv mission WUvS instrument FUv-Uv CCD detectors qualification campaign main results

WSO-UV mission WUVS instrument FUV-UV CCD detectors qualific...

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2020 International Conference on Space Optics, ICSO 2020

作者： Shugarov, Andrey S. Sachkov, Mikhail E. Bruce, Graham Robbins, Mark Walker, Andrew Waltham, Nick Clapp, Matthew Salter, Mike Patel, Gayatri Kuzin, Sergey vishnyakov, Eugene A. Kirichenko, Alexey S. Pertsov, Andrey A. Ivlyushkin, Denis v. Zavertkin, Pavel S. Nikolenko, Anton D. Institute of Astronomy of the Russian Academy of Sciences 48 Pyatnitskaya Street Moscow119017 Russia Teledyne UK Limited 106 Waterhouse Lane Essex ChelmsfordCM1 2QU United Kingdom STFC Rutherford Appleton Laboratory Harwell Oxford DidcotOX11 0QX United Kingdom P.N.Lebedev Physical Institute of the Russian Academy of Sciences 53 Leninskiy Prospekt Moscow119991 Russia Budker Institute of Nuclear Physics Russian Academy of Sciences 11 Ac. Lavrentiev Prospekt Novosibirsk630090 Russia

World Space Observatory Ultraviolet (WSO-Uv) is a major Russian-led international collaboration to develop a large Space-borne 1.7 m Ritchey-Chrétien telescope and instrumentation to study the Universe in the ultraviolet wavelengths. The WSO-Uv WUvS spectrograph consists of three channels: two high resolution channels (R=50000) with spectral ranges of 115-176 nm and 174-310 nm, and a low resolution (R=1000) channel with a spectral range of 115-305 nm. Each of the three channels has an almost identical custom detector consisting of a CCD inside a vacuum Enclosure, and drive electronics with associated cables. The main challenges of the WUvS detectors are to achieve high quantum efficiency in the FUv-NUv range, to provide low readout noise (≤3 e- at 50 kHz) and low dark current (≤ 12 e-/pixel/hour), to operate with integral exposures of up to 10 hours, and to provide good photometric accuracy. Teledyne e2v has designed three variants of a custom CCD272-64 sensor with different Uv AR coatings, optimised for each WUvS channel. The custom vacuum Enclosure, also designed by Teledyne e2v, prevents contamination and maintains the CCD at the operating temperature of -100oC, while the temperature of the WUvS optical bench is +20oC. STFC RAL Space has developed the Camera Electronics Box (CEB) which houses the CCD drive electronics. Digital correlated double sampling technology provides extremely low readout noise and also enables flexibility to optimise readout noise against pixel frequency for a number of normal and binned pixel readout modes. This paper presents the general trade-offs of the WUvS detector design, methods for extending the service life of the CCD sensors working with low signals in a Space radiation environment, and a summary of the measured and calculated key parameters of the WUvS detectors. © 2021 ESA and CNES

关键词： Antireflection coatings

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Renewing Fiber Optics Infrastructure on Mature Offshore Assets at Campos Basin

Renewing Fiber Optics Infrastructure on Mature Offshore Asse...

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Offshore Technology Conference, OTC 2025

作者： Ribeiro, H.L.v.F. Aloise, D. Silva, E.D. Siqueira, B.B. Nascimento, G.L. Davico, S.P. A B PETROBRAS RJ Rio de Janeiro Brazil

ISBN: (纸本)9781959025610

The "New Fiber Optic Network for Campos Basin" Project is a strategic initiative aimed at renewing the Campos Basin mature offshore assets' communication infrastructure. The project began as a business case proposition in 2020 and initiated the construction in 2024. It involves laying 500km fiber optic cables connecting two onshore stations, in Rio de Janeiro and Espírito Santo States to 12 stationary production units at depths of up to 1,800m, providing 100 Gbps links. The paper will describe all the steps in the project approval and deployment phases, including a technical description of the solutions selected for implementation, the risks associated with such choices, and how they are being mitigated. The first illumination is scheduled to take place in 2025, and as such the project is in an advanced completion stage, which shall provide valuable insights into the way in which the project is being implemented. The business case demonstrates the project strategic importance to assure investments returns by supporting the use of current and new technology on monitoring and controlling production and to assure operational safety from remote control rooms and real time integrated operation centers. The project is being executed through an engineering, procurement, construction, and installation (EPCI) contract, which is a comprehensive approach that covers the main aspects of the project from design to installation. During the initial phase, a thorough evaluation was conducted to determine the feasibility and value of investing in connectivity for mature field assets. This involved assessing the infrastructure ability to ensure actual increase of oil production. In the second phase, the project scope was detailed, designed, and the hiring strategy was defined. This phase took place in a post-pandemic booming market scenario and included not only the offshore installation of the optical fiber network but also necessary adjustments to the operating platforms and the de

关键词： Gas industry

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基于体端调制技术的快速瞬态响应LDO设计

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电子元件与材料 2024年第12期43卷 1493-1501页

作者：夏荣华陈磊崔杰上海电力大学电子与信息工程学院上海201306 南京理工大学电子工程与光电技术学院南京210094

随着Wi-Fi 7标准的提出,对低压差线性稳压器(LDO)的瞬态响应能力提出了更高的要求。为满足需要,基于0.11μm CMOS工艺,设计了一种快速瞬态响应的无输出电容高性能LDO。利用体端调制技术,为功率管级缓冲级体端提供自适应偏置,在负载跳变... 详细信息

随着Wi-Fi 7标准的提出,对低压差线性稳压器(LDO)的瞬态响应能力提出了更高的要求。为满足需要,基于0.11μm CMOS工艺,设计了一种快速瞬态响应的无输出电容高性能LDO。利用体端调制技术,为功率管级缓冲级体端提供自适应偏置,在负载跳变时实现快速瞬态响应。同时,采用以比较器为核心的摆率增强电路,进一步减小LDO输出的下冲电压。主通路通过采用折叠共源共栅与超级源跟随的架构,并使用加入调零电阻的混合共源共栅补偿来提高增益与相位裕度。仿真结果表明,在各负载条件下,相位裕度均能达到50°以上,满足稳定性需求。当负载电流在1μs内从空载跳变到40 mA时,输出下冲电压为123.6 mv,输出过冲电压为45.9 mv,相比传统LDO分别减小了1.26 v和72.5 mv。

关键词：快速瞬态响应无片外电容体端调制技术 Hybrid Cascode补偿超级源跟随

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Consumer Electronic Optics: How Small a Lens Can Be Using Metasurfaces 20

Consumer Electronic Optics: How Small a Lens Can Be Using Me...

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Conference on current developments in Lens design and optical engineering XX

作者： Thibault, Simon Univ Laval Ctr Opt Photon & Lasers COPL Quebec City PQ Canada Immervis Inc Montreal PQ Canada

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Miniature optics are used in many applications and particularly in consumer optics for such products as webcams, mobile phones, automotive components, endoscopes, tablets, and many other connected devices. Mobile phone cameras are probably the ones that have driven the race for shorter TTL over the past 10 years. Ten years ago, cell phone cameras were composed of 3-4 optical plastic elements within one camera lens;today it takes more than 6 optical elements to obtain mega pixel resolution. But it is still not enough. The market has an insatiable appetite for greater optical performance. Consequently, the lens system has become more complex and now may require more optical elements with more complex optical functions. In this context, can the metasurface lens play a role? In this paper, we will try to address this question and discuss how metasurfaces promise to become a game changer in the consumer electronics market.

关键词： Lens design Metasurface Dielectric Nanofin Aberration Cell Phone Camera Phone

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Indoor Organic Photovoltaics: Optimal Cell design Principles with Synergistic Parasitic Resistance and optical Modulation Effect

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ADvANCED ENERGY MATERIALS 2021年第27期11卷

作者： Saeed, Muhammad Ahsan Kim, Sang Hyeon Kim, Hyeok Liang, Jiaen Woo, Han Young Kim, Tae Geun Yan, He Shim, Jae Won Dongguk Univ Div Elect & Elect Engn Seoul 04620 South Korea Korea Univ Sch Elect Engn Seoul 02841 South Korea Univ Seoul Sch Elect & Comp Engn Seoul 02504 South Korea Hong Kong Univ Sci & Technol Chinese Natl Engn Res Ctr Tissue Restorat & Recon Dept Chem Kowloon Clear Water Bay Hong Kong Peoples R China Hong Kong Univ Sci & Technol Chinese Natl Engn Res Ctr Tissue Restorat & Recon Hong Kong Branch Kowloon Clear Water Bay Hong Kong Peoples R China Korea Univ Dept Chem Seoul 02841 South Korea

Recently, indoor organic photovoltaics (OPvs) has attracted substantial research attention, due to the emergence of self-powered electronic devices for Internet-of-Things (IoT) applications. This progress report discusses recent developments in indoor OPvs, focusing on the strategic role of synergistic parasitic resistance in suppressing the leakage current to achieve high indoor efficiencies. Moreover, an underexplored area is presented, namely the impact of optical modulation on enhancing light absorption in indoor OPvs. First, the main advances in material design for indoor OPvs are briefly presented. This is followed by detailed discussions of the crucial strategies, including interfacial engineering, the effect of photoactive layer thickness, and the effectiveness of transparent conducting electrodes for improving the OPv performance. Overall, this review highlights that understanding the indispensable role of parasitic resistance under dim light conditions may provide new opportunities for developing efficient indoor OPvs for practical applications. Finally, after summarizing recent progress in indoor OPvs, a critical perspective is provided.

关键词： charge transport layers indoor organic photovoltaics optical modulation effects parasitic resistance effects photoactive materials transparent conducting electrodes

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Roadmap on Advances in visual and Physiological Optics

arXiv

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arXiv 2024年

作者： Gómez-Correa, Jesús E. vohnsen, Brian Pierścionek, Barbara K. Chávez-Cerda, Sabino Kling, Sabine Rozema, Jos J. Applegate, Raymond A. Scarcelli, Giuliano Randleman, J. Bradley Goncharov, Alexander v. Fitzpatrick, Amy Morgan, Jessica I.W. Roorda, Austin Atchison, David A. Trevino, Juan P. Consejo, Alejandra Börjeson, Charlie Lundström, Linda Bang, Seung Pil Yoon, Geunyoung Karnowski, Karol Kaluzny, Bartlomiej J. Grulkowski, Ireneusz Barbero, Sergio Artal, Pablo Tabernero, Juan Kollbaum, Pete Thébault, Stéphanie C. Instituto Nacional de Astrofísica Óptica y Electrónica Coordinación de Óptica Pue 72840 Mexico Optics Group School of Physics University College Dublin Beech Hill Ireland Faculty of Health Medicine and Social Care Medical Technology Research Centre Anglia Ruskin University Bishops Hall Lane Chelmsford United Kingdom ARTORG Center for Biomedical Engineering Research University of Bern Freiburgstrasse 3 Bern3010 Switzerland Visual Optics Lab Antwerp Faculty of Medicine and Health Sciences University of Antwerp Wilrijk Belgium Dept. of Ophthalmology Antwerp University Hospital Edegem Belgium College of Optometry University of Houston HoustonTX United States University of Maryland College ParkMD United States Cole Eye Institute ClevelandOH United States School of Natural Sciences University of Galway Ireland Scheie Eye Institute Department of Ophthalmology University of Pennsylvania PhiladelphiaPA United States Center for Advanced Retinal and Ocular Therapeutics University of Pennsylvania PhiladelphiaPA United States Herbert Wertheim School of Optom. Vis. Sci. University of California Berkeley BerkeleyCA94720-2020 United States Centre for Vision and Eye Research Queensland University of Technology Kelvin Grove Australia Universidad Politécnica de Puebla Cuanalá Puebla 72640 Mexico Tecnológico de Monterrey Mexico University of Zaragoza Zaragoza Spain KTH Royal Institute of Technology Department of Applied Physics Stockholm Sweden Department of Ophthalmology Keimyung University Dongsan Medical Center Daegu Korea Republic of International Centre for Translational Eye Research ul. Skierniewicka 10A Warsaw01-230 Poland Institute of Physical Chemistry Polish Academy of Sciences ul. M. Kasprzaka 44/52 Warszawa01-224 Poland Department of Ophthalmology Collegium Medicum Nicolaus Copernicus University ul. M. Curie Sklodowskiej 9 Bydgoszcz85-094 Poland Institute of Physics Faculty of Physics Astronomy and Informatics Nicolaus Copernicus Un

The field of visual and physiological optics is undergoing continuous significant advancements, driven by a deeper understanding of the human visual system and the development of cutting-edge optical technologies. This Roadmap, authored by leading experts, delves into critical areas such as corneal biomechanical properties, keratoconus, and advancements in corneal imaging and elastography. It explores the intricate structure-function relationship within the eye lens, offering new perspectives through lens models and ray tracing techniques. The document also covers advancements in retinal imaging, highlighting the current state and future directions, and the role of adaptive optics in evaluating retinal structure and function in both healthy and diseased eyes. Furthermore, it addresses the modelling of ocular surfaces using different mathematical functions and examines the factors affecting peripheral image quality in the human eye, emphasizing the importance of these aspects in visual performance. Additional topics include schematic and functional models of the human eye, the impact of optical and chromatic aberrations, and the design of contact, and intraocular lenses. Finally, the Roadmap addresses the intersection of neurosciences with vision health, presenting a comprehensive overview of current research and future trends aimed at improving visual health and optical performance. Ultimately, this Roadmap aims to serve as a valuable resource for ophthalmologists, optometrists, vision scientists, and engineers dedicated to advancing the field of visual and physiological optics. Copyright © 2024, The Authors. All rights reserved.

关键词： Adaptive optics

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Scanless Spectral Imaging of Terahertz vortex Beams Generated by High-Resolution 3D-Printed Spiral Phase Plates

SMALL SCIENCE

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SMALL SCIENCE 2024年第12期4卷 2400352页

作者： Paraipan, Andreea Aura Gonzalez-Hernandez, Diana Reddy, Innem v. A. K. Balistreri, Giacomo Zanotto, Luca Shalaby, Mostafa Morandotti, Roberto Liberale, Carlo Razzari, Luca Inst Natl Rech Sci INRS Ctr Energie Mat Telecommun 1650 Blvd Lionel Boulet Varennes PQ J3X 1P7 Canada King Abdullah Univ Sci & Technol KAUST Biol & Environm Sci & Engn Div Thuwal 239556900 Saudi Arabia Univ Buffalo Dept Biomed Engn Buffalo NY 14260 USA Swiss Terahertz GmbH Swiss Terahertz Res Zurich CH-8005 Zurich Switzerland King Abdullah Univ Sci & Technol KAUST Comp Elect & Math Sci & Engn Div Thuwal 239556900 Saudi Arabia

Terahertz technology has experienced significant advances in the past years, leading to new applications in the fields of spectroscopy, imaging, and communications. This progress requires the development of dedicated optics to effectively direct, control and manipulate terahertz radiation. In this regard, 3D printing technologies have shown great potential, offering fast prototyping, high design flexibility, and good reproducibility. While traditional 3D printing techniques allow for the preparation of terahertz optical components operating at relatively low frequencies (<0.4 THz) due to their limited resolution, two-photon polymerization lithography (TPL) exhibits high detail resolution and low surface roughness and can thus potentially enable the fabrication of high-frequency terahertz devices. Here, as a proof of principle, spiral phase plates operating at 1 THz are designed and fabricated by means of TPL. Moreover, these samples are characterized via a rapid and scanless terahertz imaging technique customized to obtain a coherent hyperspectral analysis of the generated vortex beams at varying distances along propagation. Numerical simulations are also conducted for comparison with experiments, revealing a good agreement. current limitations of the technique are found to be mainly related with terahertz loss in TPL polymers, and possible solutions are discussed.

关键词： high-resolution 3D printing scanless terahertz hyperspectral imaging spiral phase plate terahertz vortex beam two-photon polymerization lithography

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原子芯片的基本原理、关键技术及研究进展

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物理学报 2021年第2期70卷 50-69页

作者：李沫陈飞良罗小嘉杨丽君张健电子科技大学电子科学与工程学院成都611731 中国工程物理研究院电子工程研究所绵阳621999

飞速发展的激光冷却、囚禁与操控中性原子的理论和实验技术不仅促进了人们对微观物质运动规律的认知,而且在精密测量和量子信息领域催生了多项颠覆性的器件与应用.不同于传统复杂庞大的原子光学实验装置,原子芯片通过在硅等基底上制备... 详细信息

飞速发展的激光冷却、囚禁与操控中性原子的理论和实验技术不仅促进了人们对微观物质运动规律的认知,而且在精密测量和量子信息领域催生了多项颠覆性的器件与应用.不同于传统复杂庞大的原子光学实验装置,原子芯片通过在硅等基底上制备的表面微纳结构或器件来精准控制磁场、电场或光场,从而在小尺度、低功耗条件下实现对原子的强束缚与相干操控,被认为是一种稳定、精确、功能及扩展性强大的原子及其量子态片上实验平台,具有广泛且重大的应用价值.本文首先简要回顾了原子芯片的发展历程,然后介绍了基于载流导线的微势阱及微导引实现原子芯片的基本原理,并着重讨论了基于载流导线的原子芯片制备技术、测试方法和集成的全链条关键实现技术.随后,本文综述了各国与原子芯片相关的研究计划布局和主要应用进展,指出原子芯片走向实用面临的挑战性问题,并对其未来发展进行了展望.

关键词：原子芯片原子磁导引冷原子原子光学

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Novel A-π-A-D type perylene diimide acceptor for high-performance fullerene-free organic solar cells

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Synthetic Metals 2022年 286卷 117054-117054页

作者： Ge, XianXian Chen, Daoyuan Yin, Yuli Zheng, Zhi Guo, Fengyun Gao, Shiyong Zhang, Yong School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China School of Chemistry and Chemical Engineering University of South China Hengyang421001 China School of Materials Science and Engineering Zhengzhou University Zhengzhou450001 China

Two novel PDI-based acceptors PDI-SPAc and FPDI-SPAc, which contain perylene diimide (PDI) and a quasi-two-dimensional (quasi-2D) fused PDI (FPDI), respectively, with electron-rich unit 10 H-spiro[acridan-9,9′-fluorene] (SPAc), were designed and synthesized to investigate their application in non-fullerene organic solar cells (NF-OSCs). Expectedly, FPDI-SPAc obtained a fairly twisted conformation in consequence of the quasi-2D configuration of FPDI unit and significant dihedral angle between FPDI and SPAc units. Geometry of PDI-SPAc containing only dihedral angle between PDI and SPAc units was confirmed, too. The optical properties, electron energy levels, charge transport properties, photovoltaic performance, charge dissociation probabilities, and surface morphology were systematically investigated subsequently. By blending with a narrow band-gap polymer PTB7-Th as the polymer donor, NF-OSC based on PTB7-Th:FPDI-SPAc achieved a power conversion efficiency (PCE) of 3.92% with the dominant configuration characteristic, whereas the PDI-SPAc-based NF-OSC exhibited a PCE of only 0.32% with a significantly reduced short-circuit current density (Jsc) of 1.2 mA/cm2. The interesting results indicate that, the quasi-2D structure of FPDI unit produced impressive effect on the photovoltaic performances of the FPDI derivative acceptors, which can demonstrate that quasi-2D structure is a better electron-deficient segment in comparison with PDI for the design of n-type photovoltaic materials. © 2022 Elsevier B.v.

关键词： Organic solar cells

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