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光电工程 2023年第3期50卷 74-99页

作者：董彬张娟王达伟张亦元张乐然李瑞辛晨刘顺利张子航吴昊蒋绍军朱苏皖刘炳瑞吴东中国科学技术大学精密机械与精密仪器系中国科学院材料力学行为与设计重点实验室安徽省高等学校精密科学仪器重点实验室安徽合肥230026 中国科学技术大学第一附属医院生命科学与医学部安徽合肥230001

光学器件正在向着小型化、集成化以及柔性可变形等方向发展,基于集成微纳光学器件的光学系统以其较低的功耗、快速的响应时间以及高信息容量等优势脱颖而出。然而目前的高精度微纳加工手段如聚焦离子束(focused ion beam,FIB)刻蚀、半... 详细信息

光学器件正在向着小型化、集成化以及柔性可变形等方向发展,基于集成微纳光学器件的光学系统以其较低的功耗、快速的响应时间以及高信息容量等优势脱颖而出。然而目前的高精度微纳加工手段如聚焦离子束(focused ion beam,FIB)刻蚀、半导体光刻等工艺复杂,且缺乏灵活性。飞秒激光作为一种非接触、高精度、高脉冲强度的“冷”加工工具在微纳加工方面受到格外青睐。本文首先阐述了飞秒激光加工微纳光学器件的背景及相关机理,然后讨论了提高飞秒激光加工分辨率的各种方法,接着综述了基于飞秒激光的多种先进加工手段,其后总结了近年来飞秒激光加工微透镜、光栅、光波导以及光子晶体方面的代表性研究进展。最后,本文概括了飞秒激光加工微纳光学器件研究领域所面临的挑战以及未来发展方向。

关键词：飞秒激光高精度微纳结构光学器件

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显微集成术中光学相干断层血流造影术

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中国激光 2022年第15期49卷 119-126页

作者：张子艺俞晨阳乔依琳沈丽君程丹李鹏浙江大学光电科学与工程学院浙江杭州310027 浙江大学嘉兴研究院智能光电创新中心浙江嘉兴324000 温州医科大学附属眼视光医院杭州院区眼底病专科浙江杭州310020

提出一种集成手术显微镜的术中光学相干血流造影系统(iOCTA)来实现术中眼底视网膜血流灌注的动态监测。通过光学相干断层扫描血管造影(OCTA)系统的光路与商用手术显微镜的助手镜的成像光路耦合,实现显微镜-OCTA的系统集成,这种简捷的耦... 详细信息

提出一种集成手术显微镜的术中光学相干血流造影系统(iOCTA)来实现术中眼底视网膜血流灌注的动态监测。通过光学相干断层扫描血管造影(OCTA)系统的光路与商用手术显微镜的助手镜的成像光路耦合,实现显微镜-OCTA的系统集成,这种简捷的耦合方式便于现有手术显微镜的功能升级。采用基于逆信噪比和去相关的光学相干血流运动造影(ID-OCTA)算法,实现高信噪比的眼底微血管成像。利用该系统实现了活体兔眼的术中眼底血流灌注成像,揭示了血流灌注随眼内压的时空动态演变过程,发现急性高眼内压(60 mmHg;1 mmHg=133.32 Pa)将导致血流灌注密度值在短时间内降低至基线值的20%以下。所研制的iOCTA系统有望实现眼科手术中眼底血流灌注的实时监测,有助于外科医生客观评价手术过程和预测术后效果。

关键词：医用光学生物医学成像光学相干层析成像光学相干血流造影术中成像

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Roles of Bioelectronics for Quality of Life

Roles of Bioelectronics for Quality of Life

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European Conference on Solid-State Circuits (ESSCIRC)

作者： H. Schmidt A. Shakouri M. Isaacson S. M. Kang Baskin School of Engineering University of California Santa Cruz Santa Cruz CA USA

Bioelectronics is an important technology in enhancing the quality of life, especially for those who are suffering from physiological difficulties. Novel biomimetic microelectronic systems will enable treatment of some of presently incurable human handicaps such as hearing loss, blindness (retinal prosthesis), paralysis (neuron-muscular prosthesis), and memory loss (cortical prosthesis). With advancement of bionanotechnology and quantitative medical research, the potential application of biomimetic systems is highly promising. In this paper we review the current status of biomimetic microelectronic systems and challenging issues in basic interface between electrodes and neuronal network, laboratory on a chip (LoC), and generation of power for implantable devices. For laboratory-on-a-chip (LoC), we examine a new way of detecting and sensing molecules on a chip with single molecule/particle sensitivity by fusing integrated optics with microfluidics, based on integrated hollow-core antiresonant reflecting optical waveguides (ARROW) waveguides. With multilayer dielectric confinement, the light is guided through hollow channels with cross sections of a few microns squared. We have demonstrated efficient light guiding in liquid-core ARROWs, single-molecule fluorescence sensitivity in fully planar beam geometry, surface-enhanced Raman scattering, fluorescence from live ribosomes in buffer solution, and electrical fluorescence control by applying a voltage between fluidic reservoirs connected to the waveguide channels. For electrical power sourcing of implantable biomimetic devices and systems, we illustrate the potential of the diffusion potential differences established between two half-cells of electrolyte solutions of different concentrations to generate directly an electric current. This concentration cell operates solely on a salt concentration gradient. The future advancement of biomimetic systems design will critically depend on computer aids as in VLSI developments

关键词： Biomimetics Prosthetics optical waveguides Fluorescence Laboratories Lab-on-a-chip Power generation Integrated optics optical buffering optical waveguide components

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Temperature dependence on the energy gap selection in two cell, four terminal tandem solar cell design

Temperature dependence on the energy gap selection in two ce...

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The Conference Record of the Twenty-Second IEEE Photovoltaic Specialists Conference - 1991

作者： Z. Lin X. Huang W.B. Berry Department of Electrical Engineering University of Notre Dame Notre Dame IN USA

Temperature effects on the choice of the optimum energy gap combination (OEGC) for a two-cell, four-terminal tandem system are considered. The OEGC variation with temperature and the variation of the constant system efficiency contour curves with temperature are presented by using the typical GaAs/sub 1-x/P/sub x/ and Si experimental values. Calculation shows that OEGC shifts to higher energy values with increasing temperature under the optimum AM1.5 tabulated spectra photon flux approximation formula. Temperature dependence of a single-cell energy gap for fixed bottom cell and the material property effects are also considered. As an example, the design for GaAs/sub 1-x/P/sub x/ and Si tandem system is presented.< >

关键词： Temperature dependence Photovoltaic cells Photonic band gap P-n junctions optical saturation Absorption current density Material properties Energy conversion Power conversion

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Utilization of polymer enclosed intermediate class arresters to improve the performance of modern power systems

Utilization of polymer enclosed intermediate class arresters...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： D.W. Lenk J.L. Koepfinger J.D. Sakich Ohio Brass Company Wadsworth OH USA Duquesne Light Company Pittsburgh PA USA

The first commercially available polymer enclosed intermediate class metal oxide surge arrester is introduced. The unique construction of the design is described, including reduced size, increased flexibility, a collared seal on the polymer housing and an open webbed fiberglass-epoxy module which houses the metal oxide disc elements. Performance advantages are discussed. These include improved short term contamination performance of the insulator-like polymer design when compared to multi-unit porcelain housed designs. Data show that polymer housed open-webbed fiberglass module construction extends the pressure relief capability beyond that of typical porcelain enclosed designs. The capability of the polymer enclosed design to withstand repeated pressure relief tests, simulating system reclose on a failed arrester, is also discussed. The circumstances at one utility which has considered utilizing polymer enclosed intermediate class arresters to effectively upgrade their system protection capabilities are discussed. Some suggested changes to the current ANSI C62.11 standard relative to testing polymer enclosed intermediate class arresters are addressed.< >

关键词： Polymers Arresters Modular construction Porcelain Surge protection Seals Contamination Plastic insulation optical fiber testing System testing

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In-channel modifications for improved optical detection of phosphate in a microfluidic chip design

In-channel modifications for improved optical detection of p...

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OCEANS - Europe

作者： Joyce O’Grady Nigel Kent Ivan Maguire Philip McGinnity Eleanor Jennings Fiona Regan DCU Water Institute School of Chemical Sciences Dublin City University Dublin Ireland engCORE School of Aerospace Mechanical and Electronic Engineering Carlow Institute of Technology Carlow Ireland School of Biological Earth and Environmental Sciences University College Cork Cork Ireland line 2 Centre for Freshwater Studies and Department of Applied Sciences Dundalk Institute of Technology Dundalk Ireland

Recent developments in the area of low cost optical analysers has enabled rapid, reliable and robust analysis of water nutrient levels, such as phosphate, in water systems. Herein, describes an enhancement study of a previously demonstrated lab- on-a-disc (LOAD) centrifugal microfluidic device for the detection of phosphate in freshwater. The LOAD device utilizes a microfluidic sample processing to enable high precision metering and reagent mixing, followed by colorimetric analysis (at 880 nm) of the resultant complex. A customisable and complementary, in-house analysis system was also developed to enhance user interaction and enable rapid analysis. This analysis system delivers both disc centrifugation and automated colourimetric detection of the LOAD device, with recording of data transmitted via PC interface. The aim of this study is to maintain the same level of sensitivity of the current[1] system with a reduced pathlength. The limit of detection (LOD) and limit of quantification (LOQ) for this new revised system are as follows: The blackened chip obtained the best sensitivity with an LOD and LOQ of 6 and 19 μg L -1 respectively, followed by the P80 roughened chip which achieved 13 and 38 μg L -1 , these results will be discussed further in this *** previously demonstrated microfluidic platform demonstrated an optical path length detection of 75 mm for optimal detectability, resulting in low quantity of sample testing per disc. This work details the optimisation of the disc design through a reduction of path length, therefore increasing the number of test replications on-disc by two-fold and a reduction in reagent consumption, whilst maintaining the same sensitivity using photo-enhancement techniques. The photo-enhancement techniques described in this paper utilize detection channel surface modifications, e.g. coatings and refractive index modification. These assist in significantly improving the signal-to-noise (S/N) with increased transmittance, hence

关键词： optical sensors Microfluidics Chemicals Sensitivity Paints Detectors Light emitting diodes

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III-V compund based heterostructure opto-thyristor for pulsed power applications

III-V compund based heterostructure opto-thyristor for pulse...

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International Conference on Pulsed Power

作者： J.H. Hur P. Hadizad H. Zhao S.G. Hummel J.S. Osinski P.D. Dapkus H.R. Fetterman M.A. Gundersen Department of Electrical Engineering Electrophysics University of Southern California Los Angeles CA USA Department of Electrical Engineering University of California Los Angeles CA USA

An analysis od III-V compound based eterostructure opto-thyristor (HOT) for pulsed power switching application which require gate isolation, fast current rate of rise, and high gating gain is presented. design, fabrication, and performance of the device are discussed. The device has AlGaAs/GaAs heterojunction whigh allows an efficient coupling of gatin light to the critical region of the device, thus improving the gating gain and the current rate of rise.

关键词： III-V semiconductor materials Gallium arsenide Photonic band gap Circuits Pulse measurements Diode lasers MOCVD Heterojunctions Cathodes optical fiber devices

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Investigation of induction cells and modulator design for heavy ion accelerators

Investigation of induction cells and modulator design for he...

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IEEE/NPSS Symposium on Fusion engineering

作者： C.G. Fong L.R. Reginato Lawrence Berkeley National Laboratory Berkeley CA USA

The induction linear accelerator has been a leading candidate in the US for the acceleration of high-current heavy ion beams to initiate inertial confinement fusion. The authors describe the rather unique parameters derived from the accelerator beam dynamics, and address the design and development of accelerator induction cells and their modulators to be used in a near-term driver scaling experiment named the Induction Linac Systems Experiments (ILSE) planned for construction starting in 1994. Work is underway to develop the cells and their pulse modulators. Tradeoffs between the amorphous core material, pulse length, and risetime and falltime are made against efficiency, costs, and technical risks. The tradeoffs between ferromagnetic material efficiency and costs are made with the size and costs of the PFNs. With a total requirement of up to 100 metric tons, ILSE could well become one of the largest users of ferromagnetic materials for pulsed applications.< >

关键词： Costs Pulse modulation Magnetic materials Linear accelerators Acceleration Ion beams Inertial confinement Particle beams Ion accelerators optical modulation

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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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POLYMER LIQUID-CRYSTALLINE MATERIALS

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INTERNATIONAL MATERIALS REVIEWS 1991年第5期36卷 165-186页

作者： JACKSON, CL SHAW, MT NATL INST STAND & TECHNOL GAITHERSBURG MD USA UNIV CONNECTICUT INST MAT SCI DEPT CHEM ENGN STORRS CT 06268 USA

A review of the chemical structures, physical properties, and current and potential applications of liquid crystalline polymers (LCPs) is presented. Comparisons are made between LCPs, low molecular weight liquid crystals (LCs), and conventional polymers for readers unfamiliar with the field. The ordered liquid phases are classified and molecular requirements for the formation of LC phases in both LCP melts (thermotropics) and LCP solutions (lyotropics) are discussed. The theoretical predictions of the formation of ordered phases given by Flory and Onsager are compared with experimental data, and other aspects of the phase behaviour of LCPs in solution are considered, including physical gelation and crystal-solvate complexes. A wide variety of polymer structures that exhibit LC behaviour are presented. These include main chain (rigid rod), semiflexible, main chain with flexible spacers, and side chain LCPs, and various new combinations that have been recently devised. An emphasis is placed on the relationship between chemical and physical structure of LCPs, rather than on the details of the synthesis. The unique physical properties of these materials, including the rheological or flow behaviour, optical, electrical, and mechanical properties, and possible applications in blends, composites, optical devices, elastomers, and other areas are highlighted.

关键词： Thermal barrier coatings Bond coat Yttria stabilised zirconia Low thermal conductivity EB-PVD CMAS Erosion Impact design methodologyPreview | Abstract | Full Text | PDF (2259 KB) | FiguresNovember 18 2013C SuryanarayanaC Suryanarayana A InoueA InoueSuryanarayanaSuryanarayana InoueInoueSuryanarayana et al.Suryanarayana et al.Iron-based bulk metallic glassesIron-based bulk metallic glassesC SuryanarayanaC Suryanarayana A InoueA InoueSuryanarayanaSuryanarayana InoueInoueSuryanarayana et al.Suryanarayana et al.Volume: 58 Issue: 3 pp. 131–166http://***/10.1179/1743280412Y.0000000007Keywords: Fe-based bulk metallic glasses Soft magnetic materials Structural materials Glass-forming ability ApplicationsPreview | Abstract | Full Text | PDF (1298 KB) | FiguresNovember 12 2013D E AstonD E Aston J R BowJ R Bow D N GangadeanD N GangadeanAstonAston BowBow GangadeanGangadeanAston et al.Aston et al.Mechanical properties of selected nanostructured materials and complex bio-nano hybrid and hierarchical systemsMechanical properties of selected nanostructured materials and complex bio-nano hybrid and hierarchical systemsD E AstonD E Aston J R BowJ R Bow D N GangadeanD N GangadeanAstonAston BowBow GangadeanGangadeanAston et al.Aston et al.Volume: 58 Issue: 3 pp. 167–202http://***/10.1179/1743280412Y.0000000012Keywords: Nanomaterials Mechanical properties Nanomechanics Size-scale effects Ultra-strength Deformation mechanismsPreview | Abstract | Full Text | PDF (1660 KB) | FiguresNovember 12 2013R P SearR P SearSearSearSearSearThe non-classical nucleation of crystals: microscopic mechanisms and applications to molecular crystals ice and calcium carbonateThe non-classical nucleation of crystals: microscopic mechanisms and applications to molecular crystals ice and calcium carbonateR P SearR P SearSearSearSearSearVolume: 57 Issue: 6 pp. 328–356http://***/10.1179/1743280411Y.0000000015Keywords: Nucleation Crystallisation Molecular crystals Ionic crystals ReviewPreview | Abstract | Full Text | PDF (1004 KB) | FiguresNovember 12 2013T H Sil

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