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current developments in optical design and engineering v

ISBN: (纸本)0819418994

This conference proceedings contains 31 papers on optical systems, devices and materials. The main topics are: design of anastigmat microscopes;abnormal dispersion liquids;optical imaging systems;telescopes;speckle cameras;spaceborne optical instruments;polymeric optical components;lidar;optical design and analysis;optical waveguides;infrared cameras;etc.

关键词： optical systems

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current developments in optical design and engineering vII

Current developments in optical design and engineering VII

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current developments in optical design and engineering vII

The proceedings contains 41 papers from the conference on current developments in optical design and engineering vII. The topics discussed include: laser beams;spherical aberrations;bar code scanners;zoom lenses;mirror telescopes;linear detector arrays;streak cameras;laser projection displays;video color mixers;optomechanical design;aspherical mirrors;x-ray optics system;optical resins;high-power lasers;birefringence;light reflection;finite element method and mumerical simulation.

关键词： optical design

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Wireless Devices for optical Brain Stimulation: A Review of current developments for Optogenetic Applications in Freely Moving Mice

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CELLULAR AND MOLECULAR BIOengineering 2025年第1期18卷 1-13页

作者： Silva, Patricia Jacinto, Luis Fac Med Univ Porto FMUP Dept Biomed Expt Biol Unit P-4200319 Porto Portugal

PurposeOptogenetics is an invaluable tool to study brain circuits, but typical systems rely on tethered approaches to deliver light to the brain that hinder natural behavior. With the increasing prevalence of complex behavioral phenotyping in neuroscience experiments, wireless devices for optical stimulation offer great promise to overcome these *** this work we critically review recent systems engineering and device design approaches to deliver light to the brain with wireless operation for optogenetic *** describe strategies used for wireless control and communication, wireless power transfer, and light delivery to the brain with a focus on device integration for in vivo operation in freely behaving *** advances in optoelectronic systems, material science, and microtechnology have enabled the design and realization of miniaturized wirelessly-controlled optical stimulators for true untethered experiments in rodent models.

关键词： Optogenetics Wireless devices Optoelectronics Rodent behavior Neural modulation

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Photodetector Innovations for Advancing Wearable optical Biosensors: A Review

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IEEE SENSORS JOURNAL 2025年第3期25卷 4070-4095页

作者： Ebrahimi, Zobair Gosselin, Benoit Univ Laval Dept Elect & Comp Engn Quebec City PQ G1V 0A6 Canada

optical biosensors such as photoplethysmography (PPG), pulse oximetry, and near-infrared spectroscopy (NIRS) are critical health monitoring tools, providing critical insights into physiological indicators such as heart rate (HR), oxygen saturation, blood pressure (BP), and respiratory rate (RR). At the core of these sensors are photodetectors (PDs), which are available in various types, including inorganic [such as p-n, p-i-n, avalanche, CMOS, single-photon avalanche, silicon photomultiplier (SiPM), and dynamic PDs (DPDs)] and organic (such as bulk heterojunction (BHJ), photomultiplication (PM), and hybrid CMOS PDs). The choice of a PD significantly influences optical biosensor performance by affecting key factors such as photosensitivity, detectivity, signal-to-noise ratio (SNR), dynamic range (DR), low-light detection, parasitic capacitance, dark current, noise, power consumption, and design complexity. This article provides a detailed review of the latest innovations in PDs and their associated readout circuit designs, highlighting how they enhance the performance of optical biosignal sensing. It also explores future trends in PD development, including high-mobility semiconductors, ultrathin PD layers, and novel fabrication techniques that are driving the evolution of the next-generation biosignal sensing solutions.

关键词： optical sensors Sensors Biosensors Biomedical optical imaging optical pulses Monitoring optical variables measurement optical saturation optical device fabrication optical reflection Health monitoring near-infrared spectroscopy (NIRS) optical biosensor photodetector (PD) photoplethysmography (PPG) sensor pulse oximeter readout circuit design vital signs

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First partial pressure measurements using optical Penning Gauge at the COMPASS tokamak

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FUSION engineering AND design 2025年 216卷

作者： Weinzettl, v. vartanian, S. Dejarnac, R. Jerab, M. Havranek, A. Jaulmes, F. Dimitrova, M. Naydenkova, D. Czech Acad Sci Inst Plasma Phys U Slovanky 2525-1a Prague 8 Czech Republic CEA IRFM F-13108 St Paul Les Durance France

The optical Penning Gauge for partial pressure measurements has been successfully implemented in the lower high-field side diagnostic port of the COMPASS tokamak, demonstrating a cost-effective way for resolving deuterium and helium and enabling measurements on timescales of about ten milliseconds. The procedure of its implementation is described in detail. Calibration data for deuterium and helium are discussed, including the effect of deuterium pressure on the helium channel. Time-resolved measurements of the working gas (deuterium) and the main gaseous impurity (helium) show, how helium, used for glow discharge conditioning and typically amounting to 5 - 10 % in the shots, is released from the surface of the tokamak vacuum vessel and the plasmafacing components during the subsequent shot. Behavior of both gases in L-mode, ELM-free and ELMy H-mode regimes and even just after the main (high-current high-temperature) discharge is exemplified. Surprisingly long low-current after-discharges (2 - 3 kA, about 100 ms), predominantly in helium, were observed with the optical Penning Gauge and confirmed with other diagnostics. Simulations of the breakdown and burn-through phase for COMPASS using the DYON code are introduced, showing reasonable agreement with the measured data.

关键词： optical Penning Gauge Partial pressure COMPASS Plasma diagnostic Tokamak

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current developments in optical design and engineering vI

Current Developments in Optical Design and Engineering VI

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current developments in optical design and engineering vI 1996

The proceedings contain 53 papers. The topics discussed include: development of a three-channel SWIR camera, for ground-based astronomical imaging. (two micron all sky survey, 2MASS);evaluation of a demonstration telescope for the pluto express mission;impact of zonal irregularity and refractive index errors on infrared lens performance;optical performance budget for the far ultraviolet spectroscopic explorer;compact prism-based optics for two-axis gimbal systems allowing large aperture and field of regard;using wavefront sensor information in image post-processing to improve the resolution of telescopes with small aberrations;scanning near-field infrared microscope with a free electron laser illumination source;infrared incoherent imaging: elements of rotary encoder optical design;and dry resist technology to fabricate optimized microlenses centered to the end of a monomode fiber with electron-beam lithography.

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Subcell-Resolved EQE Method Using Reverse voltage Biasing for Multijunction Photovoltaics With Overlapping Subcell Absorptance

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PROGRESS IN PHOTOvOLTAICS 2025年

作者： Beattie, Meghan N. Schachtner, Michael Siefer, Gerald Lackner, David Hoehn, Oliver Hinzer, Karin Helmers, Henning Fraunhofer Inst Solar Energy Syst ISE Freiburg Germany Univ Ottawa Sch Elect Engn & Comp Sci SUNLAB Ottawa ON Canada

External quantum efficiency (EQE) measurements of individual subcells in multijunction photovoltaic devices are essential to evaluate current matching and to iterate the design process. The standard light biasing technique used to measure subcell EQE falls short when multiple subcells absorb within the same spectral region. In this work, we demonstrate a three-step reverse voltage biasing EQE method, which measures any number of subcells with overlapping absorptance: (1) A light bias is applied to generate current mismatch between the subcells. (2) current-voltage (I-v) characteristics are measured into reverse bias, where the limiting subcell enters reverse-bias breakdown and the device current climbs to a plateau at the photocurrent of the next limiting subcell, producing a staircase I-v curve. (3) Each subcell EQE curve is measured using a voltage bias within its current plateau. We demonstrate this approach for a two-junction GaAs-based photonic power converter, comparing to the standard light biasing method and revealing better than 0.8% absolute agreement when the top junction is preferentially biased in the reverse voltage biasing method. We demonstrate the viability of the method by measuring the EQE of all subcells in a six-junction GaAs-based photonic power converter.

关键词： external quantum efficiency III-v semiconductors laser power converter luminescence coupling multijunction optical power transmission photonic power converter power by light spectral responsivity

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design, fabrication, and testing of freeform mirror-based head-up display system

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OPTICS AND LASER TECHNOLOGY 2025年 186卷

作者： Kumar, Sumit Zhong, Wenbin Williamson, James Kumar, Prashant Furness, Thomas Lou, Shan Zeng, Wenhan Jiang, Xiangqian Univ Huddersfield Ctr Precis Technol Sch Comp & Engn EPSRC Future Metrol Hub Huddersfield HD1 3DH England

Head-up displays (HUDs) in aircraft, spacecraft, and automobiles are principally considered a safety assistance system. HUDs are transparent displays that are installed in the vehicle in an order that the observer, driver, or pilot can see pertinent information in their line of sight. current HUD systems are developed with conventional optics, which requires a large amount of space occupancy in the cabin or cockpit, thus creating accommodation challenges for the other devices. HUD systems containing multiple components have more operational challenges such as precise micron-level angular movement of folding mirror and associated significant amount of power drain of the vehicle's battery. In this research article, a HUD design containing a single freeform mirror without compromising the optical performance of the system is proposed. The novel design provides the opportunity to make the system more compact and energy efficient as no separate electro-mechanical component is required for beam folding and additional tracking devices. Also, the larger Eyebox dimension obtained with the use of freeform mirror makes the HUD system definitive for extreme operational conditions and flexible observation from various heights. With the utilization of concurrent engineering, a two-phase authentic developmental process chain is presented for the freeform mirror-based HUD system. Ultra-precision single-point diamond turning with on-machine surface measurement is utilized to convert the design of various surfaces to physical functional elements of sub-micron level form accuracy and nano-metric level surface roughness. Finally, the HUD system is validated through optical functional testing.

关键词： Head-up display Freeform optics optical system Ultra-precision manufacturing On-machine surface measurement optical functional testing

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Physical stimuli-responsive DNA hydrogels: design, fabrication strategies, and biomedical applications

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JOURNAL OF NANOBIOTECHNOLOGY 2025年第1期23卷 233页

作者： Acharya, Rumi Dutta, Sayan Deb Mallik, Hemadri Patil, Tejal v. Ganguly, Keya Randhawa, Aayushi Kim, Hojin Lee, Jieun Park, Hyeonseo Mo, Changyeun Lim, Ki-Taek Kangwon Natl Univ Dept Biosyst Engn Chunchon 24341 South Korea Kangwon Natl Univ Interdisciplinary Program Smart Agr Chunchon 24341 South Korea Kangwon Natl Univ Inst Forest Sci Chunchon 24341 South Korea Univ Burdwan Dept Bot Bardhaman 713104 West Bengal India Virginia Tech Dept Mech Engn Blacksburg VA 24061 USA

Physical stimuli-responsive DNA hydrogels hold immense potential for tissue engineering due to their inherent biocompatibility, tunable properties, and capacity to replicate the mechanical environment of natural tissue, making physical stimuli-responsive DNA hydrogels a promising candidate for tissue engineering. These hydrogels can be tailored to respond to specific physical triggers such as temperature, light, magnetic fields, ultrasound, mechanical force, and electrical stimuli, allowing precise control over their behavior. By mimicking the extracellular matrix (ECM), DNA hydrogels provide structural support, biomechanical cues, and cell signaling essential for tissue regeneration. This article explores various physical stimuli and their incorporation into DNA hydrogels, including DNA self-assembly and hybrid DNA hydrogel methods. The aim is to demonstrate how DNA hydrogels, in conjunction with other biomolecules and the ECM environment, generate dynamic scaffolds that respond to physical stimuli to facilitate tissue regeneration. We investigate the most recent developments in cancer therapies, including injectable DNA hydrogel for bone regeneration, personalized scaffolds, and dynamic culture models for drug discovery. The study concludes by delineating the remaining obstacles and potential future orientations in the optimization of DNA hydrogel design for the regeneration and reconstruction of tissue. It also addresses strategies for surmounting current challenges and incorporating more sophisticated technologies, thereby facilitating the clinical translation of these innovative hydrogels.

关键词： Physical stimuli DNA hydrogel Extracellular matrix Biomechanical cues Tissue regeneration

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design of a Transimpedance Amplifier for Self-Mixing optical Feedback System

Design of a Transimpedance Amplifier for Self-Mixing Optical...

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International Conference on Systems, Control and Automation, ICSCA 2023

作者： Bhardwaj, vibhor Kumar Maini, Surita Teerthanker Mahaveer University Uttar Pradesh Moradabad India Sant Longowal Institute of Engineering and Technology Punjab Sangrur India

ISBN: (纸本)9789819773831

The interferometric signal acquired in the photodetection method, under weak feedback conditions, often has a less magnitude, typically in the microampere range (≈10–6). Due to low magnitude, the characteristical points of the interferometric signal are highly susceptible to noise originating from optical and electronic arrangements. This meager range of current signals has been translated into an appropriate voltage level for faithful signal processing. In this paper, the authors proposed a dedicated transimpedance amplifier (TIA) to convert the photodiode current from 0.05 to 0.4 mA to a voltage level between 0.1 v and 3.2 v. The TIA has been designed using OPA320 and exhibits a gain of 8 kv/A with a −3 dB bandwidth of 250 kHz. The proposed TIA is simulated in TINA-TI and validated by fabricating a four-layer PCB prototype. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： optical feedback

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