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Conference on current developments in Lens design and optical engineering XX

作者： Gonzalez-Acuna, Rafael G. Gutierrez-vega, Julio C. Tecnol Monterrey Photon & Math Opt Grp Monterrey 64849 Mexico

We present the general formula to generated aspheric collimator lens free of spherical aberration and astigmatism. The presented formula describes the second surface of the aspheric singlet such as it correct the sphe... 详细信息

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

关键词： optical design aspheric collimator

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1300nm应变补偿量子阱激光器光电性能研究

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激光与红外 2023年第10期53卷 1520-1526页

作者：吴亚宁董海亮贾志刚贾伟梁建许并社太原理工大学新材料界面科学与工程教育部重点实验室山西太原030024 山西浙大新材料与化工研究院山西太原030024 太原理工大学材料科学与工程学院山西太原030024 陕西科技大学材料原子·分子科学研究所陕西西安710021

为了提升1300nm半导体激光器的光电特性,采取k·p方法的激光器模拟软件SiLENSe设计了GaAsSb/GaAsP/InGaAsSb应变补偿激光器,调控了有源区的能带结构,并对该结构进行了仿真计算。结果表明,与传统InGaAsSb/GaAsSb有源区对比,应变补偿... 详细信息

为了提升1300nm半导体激光器的光电特性,采取k·p方法的激光器模拟软件SiLENSe设计了GaAsSb/GaAsP/InGaAsSb应变补偿激光器,调控了有源区的能带结构,并对该结构进行了仿真计算。结果表明,与传统InGaAsSb/GaAsSb有源区对比,应变补偿结构LD2阈值电流从135mA降低至95mA。在15 A的注入电流下,工作电压从138 v降低至125 v,其输出功率从107W提高到121W,电光转换效率从521提高至646。这主要由于在势垒中引入张应变改善了有源区的能带结构,从而使载流子的泄漏受到抑制,器件性能得到了显著提升。该有源区的设计将对制备高性能中红外单模半导体激光器具有重要的理论参考价值。

关键词：半导体激光器有源区输出功率阈值电流能带结构

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Silicon/Graphene-Ito Multiple Heterojunctions and 1-D Phc Waveguide-Based Photodetection for Mid-Nir Ipe with High Responsivity

SSRN

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SSRN 2022年

作者： Laxmi, vijay Tyagi, Deepika Parveen, Abida Singh, Lalit Ouyang, Zhengbiao THz Technical Research Center of Shenzhen University Shenzhen Key Laboratory of Micronano Photonic Information Technology Key Laboratory of Optoelectronic Devices and Systems Ministry of Education College of Physics and Optoelectronic Engineering Shenzhen University Guangdong Province Shenzhen518060 China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Shenzhen University Shenzhen518060 China Centre for Optoelectronics and Biophotonics School of Electrical and Electronic Engineering Nanyang Technological University Singapore

A nanophotonic photodetector is proposed on multi-junction based on silicon-ITO (Indium Tin Oxide) slot waveguide covered with 2D (two-dimensional) graphene sheets. A heavily n-doped ITO layer is used to cover the whole device and also works as an electrode to reduce the insertion losses at the metal-graphene interfaces. Different waveguides are arranged to design a one-dimensional photonic crystal (1D PhC) and the slot is defined by creating a defect in it. Multi-junction support improves the number of carriers during illumination which results in high photocurrent, fast response across a large bandwidth, strong electron-phonon interaction, and also enhancement of photocarrier multiplications. The photodetector realizes a photoresponsivity beyond 0.6 A/W at around 1550 µm. From 0.5 v and 2 v of the bias voltage, the difference between the photocurrent and the dark current for the device with the PhC is more than 5 times that for the device without the PhC. Moreover, a 25 Gbit/s non-return to zero optical transmission is measured at 10 km transmission. The proposed device has diverse applications such as telecommunications, optical computing, interconnects, laser radar, lab-on-chip for sensing, and on-chip quantum photonics. © 2022, The Authors. All rights reserved.

关键词： Graphene

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An incentive-based approach for information sharing control between human and computer interface

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optical and Quantum Electronics 2024年第3期56卷 312-312页

作者： Goswami, Chandrashekhar vaishnavi, T. Sarma, Parismita Krishnammal, P. Muthu Sagar, K. v. Daya Kumar, S. Hari Department of CSE School of Computing MIT ADT University Maharashtra Pune 412201 India Department of ECE Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Chennai India Department: Information Technology Gauhati University Assam Guwahati India School of Electronics Engineering VIT-AP University Andhra Pradesh Amaravati India Department of Electronics and Computer Engineering Koneru Lakshmaiah Education Foundation Andhra Pradesh Vaddeswaram Guntur India Department of ECE Kongunadu College of Engineering and Technology Tamil Nadu Trichy India

Methods for sharing information have attracted more and more interest as a way to reduce repetitious labor drastically. However, issues with building confidence and boosting user involvement in the information-sharing procedure still need to be resolved. The current option is to utilize another entity as a trustworthy organization for sharing information. However, there isn't an evolving incentive structure for data exchange with many consumers. A constrained informational shared controller architectural methodology is presented in this work. When the automation cannot measure all system conditions or standard paths, LISC gets employed. The most common instances are technologies that are partially regulated by humans, where certain components are automated while an individual manages other parts. The suggested comprehensive design methodology utilizes the proximal potential divergence series (PPDS), an entirely new activity, to study human-machine interplay. We develop a method for locating a PPDS that fully represents a given divergent activity and required and adequate criteria for a PPDS's occurrence. A huge vehicle-manipulator structure is regulated using the suggested layout technique, with the manipulation being operated by an individual operator while the vehicle remains autonomous. A quicker and more precise controller layout contrasted with manual adjustment is made possible by experiments that demonstrate the appropriateness of such PPDS for simulating asymmetrical events. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

关键词： Cooperative shared control Human–machine co-operation (HMC) Incentive approach Limited data sharing

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Application of GPUs in optical design software 20

Application of GPUs in optical design software

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Conference on current developments in Lens design and optical engineering XX

作者： Mischuck, Brian Page, Erik Croce, Alessandra Zemax 10230 NE Points Dr 500 Kirkland WA 98033 USA

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

We present an overview of the pros and cons of using GPUs in optical design software. While GPUs can run multiple calculations in parallel, that parallelization comes with a price. We will discuss the trade-offs that allow GPUs to run up to thousands of cores in parallel and how those trade-offs effect the use of GPUs in optical design software. In particular, we review the use of GPUs in several steps of design calculations, including ray-tracing and computationally expensive steps such as calculating Huygens integrals.

关键词： OpticStudio GPU PSF Scientific Computing

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High-voltage high-current vertical geometry Ga2O3 rectifiers 11

High-voltage high-current vertical geometry Ga2O3 rectifiers

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Oxide-based Materials and Devices XI 2020

作者： Xian, Minghan Fares, Chaker Carey, Patrick Ren, Fan Tadjer, Marko Liao, Yu-Te Chang, Chin-Wei Lin, Jenshan Sharma, Ribhu Law, Mark E. Raad, Peter E. Komarov, Pavel L. Islam, Zahabul Haque, Aman Kuramata, Akito Pearton, S.J. Dept. of Chemical Engineering University of Florida GainesvilleFL32611 United States Naval Research Laboratory WashingtonDC United States Dept. of Electrical and Computer Engineering National Chiao Tung University Hsinchu Taiwan Department of Electrical and Computer Engineering University of Florida GainesvilleFL32611 United States Department of Materials Science and Engineering University of Florida GainesvilleFL32611 United States Department of Mechanical Engineering Southern Methodist University DallasTX United States TMX Scientific Inc. RichardsonTX75081 United States Department of Mechanical Engineering Penn State University University ParkPA United States Tamura Corporation and Novel Crystal Technology Inc. Saitama350-1328 Japan

ISBN: (纸本)9781510633254

There are continuing rapid developments in vertical geometry Ga2O3 for high voltage switching applications. Ga2O3 is emerging as a viable candidate for certain classes of power electronics with capabilities beyond existing technologies due to its large bandgap, controllable doping and the availability of large diameter, relatively inexpensive substrates. These include power conditioning systems, including pulsed power for avionics and electric ships, solid-state drivers for heavy electric motors and advanced power management and control electronics. There are already cases where the performance exceeds the theoretical values for SiC. Existing Si, SiC (vertical devices), and heteroepitaxial GaN (lateral devices) enjoy tremendous advantages in terms of process maturity, an advantage that is especially true for Si, where the ability to precisely process the material has resulted in devices such as super-junctions that surpass the unipolar "limit". Continued development of low defect substrates, optimized epi growth and surface treatments and improved device design and processing methods for Ga2O3 are still required to push the experimental results closer to their theoretical values. Even 3 μm epi layers with doping concentration of 1016 cm-3 should have a theoretical breakdown voltage of ∼1800v. The actual experimental value of vB is currently well below the theoretical predictions. Thermal management is a key issue in Ga2O3 power devices for practical high current devices and initial studies have appeared on both the experimental and theoretical fronts. We summarize progress in edge termination design, temperature measurement using thermoreflectance-based thermography to measure the thermal rise and decay of the active diodes, failure under forward bias and development of large current (up to 130A) arrays. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Wide band gap semiconductors

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Light in the Larynx: a Miniaturized Robotic optical Fiber for In-office Laser Surgery of the vocal Folds

arXiv

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arXiv 2022年

作者： Chiluisa, Alex J. Pacheco, Nicholas E. Do, Hoang S. Tougas, Ryan M. Minch, Emily v. Mihaleva, Rositsa Shen, Yao Liu, Yuxiang Carroll, Thomas L. Fichera, Loris The Department of Robotics Engineering Worcester Polytechnic Institute WorcesterMA01609 United States The Department of Mechanical Engineering Worcester Polytechnic Institute WorcesterMA01609 United States The Department of Biomedical Engineering Worcester Polytechnic Institute WorcesterMA01609 United States The Department of Otolaryngology-Head and Neck Surgery Harvard Medical School BostonMA02115 United States

This paper reports the design, construction, and experimental validation of a novel hand-held robot for in-office laser surgery of the vocal folds. In-office endoscopic laser surgery is an emerging trend in Laryngology: It promises to deliver the same patient outcomes of traditional surgical treatment (i.e., in the operating room), at a fraction of the cost. Unfortunately, office procedures can be challenging to perform;the optical fibers used for laser delivery can only emit light forward in a line-of-sight fashion, which severely limits anatomical access. The robot we present in this paper aims to overcome these challenges. The end effector of the robot is a steerable laser fiber, created through the combination of a thin optical fiber (0.225 mm) with a tendon-actuated Nickel-Titanium notched sheath that provides bending. This device can be seamlessly used with most commercially available endoscopes, as it is sufficiently small (1.1 mm) to pass through a working channel. To control the fiber, we propose a compact actuation unit that can be mounted on top of the endoscope handle, so that, during a procedure, the operating physician can operate both the endoscope and the steerable fiber with a single hand. We report simulation and phantom experiments demonstrating that the proposed device substantially enhances surgical access compared to current clinical fibers. Copyright © 2022, The Authors. All rights reserved.

关键词： Endoscopy

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Inorganic-Organic Hybrid Dielectrics for Energy Conversion: Mechanism, Strategy, and Applications

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ADvANCED FUNCTIONAL MATERIALS 2023年第28期33卷

作者： Wu, Fan Xie, Aming Jiang, Lai Mukherjee, Soumya Gao, Han Shi, Jiaoyan Wu, Jiale Shang, Hongcheng Sheng, Zhengxiao Guo, Ronghui Wu, Lipeng Liu, Jun Suss, Matthew E. Terzis, Alexandros Li, Weijin Zeng, Haibo Nanjing Univ Sci & Technol Herbert Gleiter Inst Sch Mat Sci & Engn MIIT Key Lab Adv Display Mat & Devices Nanjing 210094 Peoples R China Nanjing Univ Sci & Technol Sch Mech Engn Nanjing 210094 Peoples R China Univ Limerick Bernal Inst Dept Chem Sci Limerick V94 T9PX Ireland Nanjing Univ Sci & Technol Sch Chem Engn Nanjing 210094 Peoples R China Natl Key Lab Electromagnet Environm Effects & Elec Nanjing 210094 Jiangsu Peoples R China Technion Israel Inst Technol Fac Mech Engn IL-300003 Haifa Israel Technion Israel Inst Technol Fac Aerosp Engn IL-300003 Haifa Israel

Dielectric materials with higher energy storage and electromagnetic (EM) energy conversion are in high demand to advance electronic devices, military stealth, and mitigate EM wave pollution. Existing dielectric materials for high-energy-storage electronics and dielectric loss electromagnetic wave absorbers are studied toward realizing these goals, each aligned with the current global grand challenges. Libraries of dielectric materials with desirable permittivity, dielectric loss, and/or dielectric breakdown strength potentially meeting the device requirements are reviewed here. Regardless, aimed at translating these into energy storage devices, the oft-encountered shortcomings can be caused by either of two confluences: a) low permittivity, high dielectric loss, and low breakdown strength;b) low permittivity, low dielectric loss, and process complexity. Contextualizing these aspects and the overarching objectives of enabling high-efficiency energy storage and EM energy conversion, recent advances in by-design inorganic-organic hybrid materials are reviewed here, with a focus on design approaches, preparation methods, and characterization techniques. In light of their strengths and weaknesses, potential strategies to foster their commercial adoption are critically interrogated.

关键词： dielectric capacitors dielectric losses dielectric materials microwave absorptions polarizations

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Laser strength multilayer interference coatings with the Gaussian profile for Nd:YAG lasers 20

Laser strength multilayer interference coatings with the Gau...

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Conference on current developments in Lens design and optical engineering XX

作者： Kuznetsov, E. v. Novopashin, v. v. Shestakov, A. v. Polyus Res Inst MF Stelmah JSC3 Moscow 117342 Russia

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

The development of laser technologies defined the novel quality demands to optical interference coatings. For many technological applications is very important to use lasers with equal distribution of laser intensity across the beam. Gradient mirrors is one of the most simple and convenient means to manage spatial distribution of laser radiation, and can be used in various lasers and laser devices. These mirrors are used as output coupler in the laser cavity to form radiation close to the Gaussian distribution which using radially varying thickness that have been proved the most practical. Multilayer dielectric mirrors with a smooth changing reflection are used in various types of laser resonators. However, in practice, not equal distributions take place especially for Q-switch lasers. It can be arise due to as mode structure of laser irradiation, as optical defects of rod. So, application of such mirrors, permit realize the selection of transverse modes in which the minimal losses possess the transverse mode with amplitude distribution close to distribution of mirror reflection. This paper presents the methodology of fabricating multilayer dielectric mirror with altering over surface parameters of reflectance.

关键词： Gaussian distribution dielectric graded reflectivity mirrors Nd:YAG laser electron-beam evaporation with ion-beam source

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Beyond the State of the Art of Electric vehicles: A Fact-Based Paper of the current and Prospective Electric vehicle Technologies

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WORLD ELECTRIC vEHICLE JOURNAL 2021年第1期12卷 20页

作者： van Mierlo, Joeri Berecibar, Maitane El Baghdadi, Mohamed De Cauwer, Cedric Messagie, Maarten Coosemans, Thierry Jacobs, valery Hegazy, Omar Vrije Univ Brussel VUB Fac Engn Dept Elect Engn & Energy Technol ETEC Mobil Logist & Automot Technol Res Ctr MOBI B-1050 Brussels Belgium Flanders Make B-3001 Heverlee Belgium

Today, there are many recent developments that focus on improving the electric vehicles and their components, particularly regarding advances in batteries, energy management systems, autonomous features and charging infrastructure. This plays an important role in developing next electric vehicle generations, and encourages more efficient and sustainable eco-system. This paper not only provides insights in the latest knowledge and developments of electric vehicles (Evs), but also the new promising and novel Ev technologies based on scientific facts and figures-which could be from a technological point of view feasible by 2030. In this paper, potential design and modelling tools, such as digital twin with connected Internet-of-Things (IoT), are addressed. Furthermore, the potential technological challenges and research gaps in all Ev aspects from hard-core battery material sciences, power electronics and powertrain engineering up to environmental assessments and market considerations are addressed. The paper is based on the knowledge of the 140+ FTE counting multidisciplinary research centre MOBI-vUB, that has a 40-year track record in the field of electric vehicles and e-mobility.

关键词： electric vehicle digital twin wide bandgap semiconductors power converters solid-state batteries ultra-high fast chargers vehicle-to-grid (v2G) vehicle-to-X (v2X) sustainable energy communities renewable energy sources autonomous electric vehicles optical wireless communications

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