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High-Speed Biomedical Imaging and Spectroscopy IX 2024

作者： Ahamed, Ahasan Rawat, Amita McPhillips, Lisa N. Marcu, Laura Saif Islam, M. Electrical and Computer Engineering Department University of California DavisCA95616 United States Biomedical Engineering Department University of California DavisCA95616 United States

ISBN: (纸本)9781510669659

Fluorescence Lifetime Imaging (FLIM) is a powerful technique that measures the decay time of fluorophores present in tissue samples alluding to their constituent molecules. FLIM has gained popularity in biomedical imaging for applications such as detecting cancerous tumors, surgical guidance, etc. However, conventional FLIM systems are limited by a reduced number of spectral bands and long acquisition time. Moreover, the large footprint, complexity, and cost of the instrumentation make it difficult for clinical applications. In this paper, we demonstrate a reconstruction-based hyperspectral detector that can resolve decay time and intensities in broad spectral ranges while providing high sensitivity, high gain, and fast response time. The hyperspectral detector is comprised of an array of efficient, ultrafast avalanche photodetectors integrated with nanophotonic structures. We utilize different nanostructures in the detectors to modulate light-matter interactions in spectral channels. This allows us to computationally reconstruct the spectral profile of the incoming fluorescence spectrum without the need for additional filters or dispersive optics. Also, the nanophotonic structures enhance efficiency (by a factor of 2 to 10 over different wavelengths) while providing fast response time. An innovative detector design has been employed to reduce the breakdown of the avalanche photodetectors to-7.8v while maintaining high gain (∼50) across the spectral range. Therefore, enabling low light detection with a high signal-To-noise ratio for FLIM applications. Added spectral channels would provide valuable information about tissue materials, morphology, and disease diagnosis. Such innovative hyperspectral sensors can now be integrated on-chip capable of miniaturizing the FLIM system and making it a commercially viable tool for clinical use. This technology has the potential to revolutionize the current FLIM system with improved detection capabilities opening doors for new ho

关键词： Hyperspectral imaging

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Realization of Free Space optical Communication

Realization of Free Space Optical Communication

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2023 International Conference on Smart Systems for Applications in Electrical Sciences, ICSSES 2023

作者： Preksha, T.v. Gaganashree, C. Shilpa, S.P. Chandrika, T.N. Siddaganga Institute of Technology Department of Electronics and Telecommunication Engineering Tumakuru India

ISBN: (纸本)9798350347296

Free Space optical (FSO) communication is a wireless method that sends data via air using light. This paper describes the integration of a FSO communication system that is powered by solar energy. The transmitter and reception ends of the experimental setup are composed of an Arduino Uno board, a laser, and a solar panel, respectively. The goal of this study is to demonstrate the viability and efficiency of an FSO communication system that uses a laser and a solar panel. In the proposed FSO communication system, the microcontroller modulates and demodulates the data transmitted over the light beam and manages the laser and solar panel. Using an Arduino and a solar panel simplifies the system's design, lowers costs, and consumes less energy. According to test results, the system can reliably transmit data up to a distance of 10 meters with low bit error rates (BER). The proposed system is an attractive alternative to current FSO communication methods, which can be costly and cumbersome due to their complexity. The results of the experiments show that the proposed system can achieve dependable communication over short to medium distances, offering a promising wireless communication option in situations where conventional communication technologies are not practical. This paper demonstrates the implementation of an FSO communication system using a laser and solar panel, as well as its viability, effectiveness, and some of the potential industries it might be utilized in, such as healthcare, transportation, and telecommunications. © 2023 IEEE.

关键词： Solar energy

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A study of electrical and optical characteristics of CZTSe solar cell using Silvaco Atlas 2nd

A study of electrical and optical characteristics of CZTSe s...

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2nd International Conference on Smart and Sustainable developments in Materials, Manufacturing and Energy engineering (SME)

作者： Mebelson, T. Joseph Elampari, K. ST Hindu Coll Phys Res Ctr Nagercoil 2 India Manonmaniam Sundaranar Univ Tirunelveli 627012 Tamil Nadu India ST Hindu Coll Dept Phys Nagercoil 2 India

This work represents the modeling and simulation of a CZTSe solar cell using the simulation software Silvaco Atlas. This simulation gives prominent results on the electrical and optical behavior of the CZTSe solar cell. In the physical structure of the cell, Indium Tin Oxide (ITO) and ZnO were used as the transparent conducting layer and the window layer respectively. The simulation study gives judicious results as open-circuit voltage (voc) of 0.45 v, Short Circuit current Density (Jsc) of 0.044 A/cm2, Fill Factor (FF) of 62.7%, Photon Conversion Efficiency (PCE) of 12.2%. The photon response characteristics of the solar cell validate the External Quantum Efficiency and the spectral response nature. The simulated CZTSe solar cell gives good results on its overall performance. (c) 2021 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Conference on Smart and Sustainable developments in Materials, Manufacturing and Energy engineering.

关键词： CZTSe Solar cell Silvaco Atlas Spectral response I-v characteristics

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Smart city compatible thin film solar cell based on extraordinary transmission and metallic patch nanoantenna

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optical Materials: X 2024年 22卷

作者： Pahuja, Abhishek Agrawal, Sachin Kumar, Sandeep Parihar, Manoj Singh Kumar v, Dinesh Department of Electronics and Communication Engineering Koneru Lakshmaiah Education Foundation AP Vijayawada522502 India Department of Electronics and Communication Engineering National Institute of Technology Delhi Delhi 110036 India School of Engineering & Technology BML Munjal University Haryana Gurugram122413 India Department of Electronics and Communication Engineering PDPM Indian Institute of Information Technology Design & Manufacturing Jabalpur MP Jabalpur482005 India

An effective performance enhancement model for the thin film solar cell conjointly based on extraordinary transmission and nanoantenna is proposed and investigated. The absorber layer of the extraordinary transmission based solar cell contains a metallic thin film with periodic holes. Maximum extraordinary transmission is accomplished as the metallic film has the same refractive index on both sides. Increased light transmission causes the absorber layer to absorb more light, which increases short circuit current density and subsequently the efficiency of the thin film solar cell. The presented analysis demonstrates that adding a square nano patch on the top surface of the absorber layer can further boost the extraordinary transmission. The extraordinary transmission is increased because of the formation of cavity nanoantenna. Cavity nanoantenna increases the coupling of light into the hole due to the excitation of surface plasmons polaritons. The proposed design of solar cell exhibits around 98% absorption and the short circuit current density is increased by a factor of 3.23. The study has been carried out using finite difference time domain (FDTD) method. © 2024 The Author(s)

关键词： Nanoantennas

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A permanent insulator system for hydrometallurgy with a significant increase in electric efficiency and without short circuit 10

A permanent insulator system for hydrometallurgy with a sign...

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10th International Conference on Lead and Zinc Processing, PbZn 2023

作者： Dufresne, Robert Arabzadeh, Hamid Pultrusion Technique St-BrunoQCJ3V 6B9 Canada

A permanent insulator system for hydrometallurgy has been developed with a significant increase in electric efficiency and without short circuits. The system consists of a double electric contact point for each cathode and anode and a new design of the insulating and contact system of the electrodes. The combination of these technologies provides a more uniform electric density inside each cathode and anode, in each cell, and also for the whole electric circuit in the cellhouse. Keeping a consistent maximum performance necessitates using parts with extreme durability against chemical attacks and short circuits. Hence, a comprehensive research into chemical stoichiometry and the behaviour of different molecules resulted in the development of an outstanding chemical resistance level to sulfuric acid and extremely high temperatures throughout the entire hydrometallurgical process. Field observations show that this formulation has been able to resist up to 19 years of continuous operation without maintenance. The goal of these developments combined with a new contact system was to reduce any type of short circuit by 70 to 80%, which in turn increases the electric current effectiveness by 8 to 10%. As a result, higher contact efficiencies have doubled the lifetime of the cathode and anode with this system. Consequently, the overall electric efficiency in a refinery cellhouse can be improved by 10-12%. Observations from real-world applications over the past decades have proven the efficiency of the earlier versions of this new concept. The system was found to be applicable to any type of contact system and has been used in various hydrometallurgical processes with great success. With the increasing price of energy and CO2 production, it has become more important to operate ecologically and efficiently to maximize profitability and this permanent insulator system can address many challenges which lead to a more efficient and cost-effective process. © 2024 Institute of Phys

关键词： Cathodes

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Modeling of 1300 nm hybrid III-v/silicon lasers

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Optik 2023年第1期288卷

作者： Saglam, Hilal Kubra Duman, Caglar Cakmak, Bulent Department of Electrical and Energy Technical Science Vocational School Atatürk University Erzurum Turkey Faculty of Engineering and Architecture Department of Electrical and Electronics Engineering Erzurum Technical University Erzurum Turkey

In this study, the modeling of a III–v-Si hybrid semiconductor laser with an InGaAsP 80 nm thick active layer at a wavelength of 1300 nm was carried out using the LaserMOD commercial software program. The mesh, gain, optical output power, optical spectrum, transient response, and near-field and far-field of the laser designed as a result of the simulations were analyzed. It was observed that the light generated in the multi quantum well (MQW) layer can be successfully transferred to the Si waveguide, allowing for light transfer from one point to another in the photonic integrated circuit (PIC) structure. From the L-I curve of the hybrid laser, the threshold current and spectral width were found to be 5 mA and 13 nm, respectively. These results were compared with those of the InGaAsP/InP laser which had a threshold current of 30 mA and spectral width of 36 nm. This demonstrates that the hybrid laser outperforms the InGaAsP diode laser by having a significantly lower threshold current and better spectral coherence. The material gain peaks and the center wavelength of the optical spectrum were obtained around 1305 nm (0.96 ev), which is consistent with the design target of the laser. Additionally, in the transient response of the hybrid laser, it was observed that the oscillations that occur at the rising and falling edges of the light output were damped after approximately 500 ps. Finally, near-field and far-field results demonstrate that a single mode operation was achieved from the hybrid laser. © 2023

关键词： III-v semiconductors

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Microstructural Changes, Tensile, and Hardness Behaviour of Welded Ti-6Al-4v Plates

Material Design and Processing Communications

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Material design and Processing Communications 2024年第1期2024卷

作者： Dewangan, Saurabh Mohite, Shlok Bhadoriya, Yash Agarwal, Ayush Paul, Adhir Chandra Department of Mechanical Engineering Manipal University Jaipur Rajasthan Jaipur303007 India Department of Leather Engineering Faculty of Mechanical Engineering Khulna University of Engineering and Technology Fulbarigate Khulna 9203 Bangladesh

In this work, Ti-6Al-4v alloy was joined by tungsten inert gas (TIG) welding and the plates were undergone through optical microscopy test, elemental study, tensile test, hardness test, and fractographic observation. Plate-A, with low value of current input, possesses α + β bimodal structure at BM, acicular martensite at HAZ, and Widmanstätten structure with a low amount of martensite at the WZ. Plate-B, with comparatively higher value of current during welding, possesses similar structure at the BM. The HAZ area was comparatively lesser with significant martensite formation, and the WZ contains considerable formation of Widmanstätten structure. The elemental composition of BM and WZ was established by EDS. The stress-strain curves for both plates show that plate-B has almost 3%, 8%, and 7% greater UTS, YS, and elongation, respectively, than plate-A. The significant formation of Widmanstätten structure has made the WZ of plate-B more ductile and tough, although the fractography analysis of both the plates has shown macrodimples and flowing sign of metal as indicators of good ductility. Copyright © 2024 Saurabh Dewangan et al.

关键词： Stress-strain curves

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optically-Controlled 3.3 kv SiC MOSFET with Fast Switching Speed and Low optical Power

Optically-Controlled 3.3 kV SiC MOSFET with Fast Switching S...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Xin Yang Guannan Shi Liyang Jin Yuan Qin Matthew Porter Che-Wei Chang Xiaoting Jia Dong Dong Linbo Shao Yuhao Zhang Center for Power Electronics Systems (CPES) Virginia Tech Blacksburg USA Bradley Department of Electrical and Computer Engineering Virginia Tech Blacksburg USA Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong China

ISBN: (数字)9798331516116

ISBN: (纸本)9798331516123

optically-controlled high-voltage power devices hold good promise for grid and renewable energy applications by providing superior electromagnetic interference (EMI) immunity and reduced switching delay. This paper proposed a novel optically-controlled gate driver architecture that applies complementary optical signals to two photodiodes (PDs) arranged in a totem-pole configuration. This configuration enables fast switching of power semiconductor devices using minimal optical power, as only low-power driver signals are optically modulated and device main current is not photogenerated. To validate this approach, we employ two InGaAs PDs to drive a 3.3 kv SiC MOSFET, the highest-voltage industrial unipolar device currently available. When each PD is illuminated by 21.7 mW optical power, the SiC MOSFET achieves hard-switching at 1500v/3A, with rise and fall times of 152 ns and 214 ns, respectively. These results set new records for switching voltage, speed, and power capacity-to-optical power ratio in optically-controlled unipolar power switches. This general optical driver design is also applicable to the future development of integrated optics for power electronics in diverse (ultra-) wide-bandgap semiconductors. 1

关键词： Integrated optics MOSFET optical design Silicon carbide optical switches optical recording optical materials Ultrafast optics optical modulation optical devices

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The Giant Magellan Telescope Mount: The Core of a Next Generation 25.4-m aperture ELT 9

The Giant Magellan Telescope Mount: The Core of a Next Gener...

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Conference on Ground-based and Airborne Telescopes IX

作者： Burgett, W. Park, S. Beifus, K. Echols, C. Lam, K-M Loewen, N. Smith, B. Ashby, D. Bernstein, R. GMTO Corp 465 N Halstead StSuite 250 Pasadena CA 91107 USA Sightline Engn Ltd 1493 Paisley Rd N Vancouver BC V7R 1C4 Canada X Double Dot LLC POB 99 Flagstaff AZ 86002 USA Steward Observ 933 N Cherry Ave Tucson AZ 85719 USA

ISBN: (纸本)9781510653467;9781510653450

The Giant Magellan Telescope (GMT) is one of three planned ground-based optical/IR Extremely Large Telescopes (ELTs) that will provide a generational leap in ground-based optical/IR capability. The GMTO Corp. completed in 2019 a multi-stage acquisition process that led to the selection of OHB Digital Connect (formerly MT-Mechatronics or MTM) and Ingersoll Machine Tools (IMT) to supply the final design, fabrication, and installation of the GMT Mount. The similar to 2000 metric ton GMT Mount comprises the telescope structures, mechanisms, and utilities but does not include the optics and science instruments. This paper provides a general overview of the technical scope of the GMT Mount including the key and driving requirements, systems engineering framework, and planned design development. Due to the GMT site location in Chile, the Mount design must accommodate a challenging seismic environment. Major Mount subsystems are also described including the Hydrostatic Bearing System (HBS), Gregorian Instrument Rotator (GIR), and the Azimuth Track and its interface to the telescope Pier. In addition, a summary is presented of the design path forward to the Final design Review (FDR) from the point of completing the Preliminary design Review (PDR) in early 2021, including the current status of critical prototyping efforts. Finally, management processes are outlined that are necessary to execute the Mount design-build contract spanning the next 8-9 years.

关键词： GMT GMTO Giant Magellan Telescope ELT Extremely Large Telescope Mount

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Structural, optical, photoluminescence, magnetic and electrochemical supercapacitor application of tin oxide nanoparticles

Structural, optical, photoluminescence, magnetic and electro...

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作者： Manikandan, E. Kannan, J.C. Devabharathi, v. Pushpa, S. Ahmad Mala, Nazir Department of Physics K S R Institute for Engineering and Technology Tamil Nadu Tiruchengode-637215 India Department of Physics Annamalai University Annamalainagar 608 002 India

The present work deals with the structural, thermal, morphological, optical, electrochemical and magnetic behavior probes of tetragonal tin dioxide (SnO2) nanoparticles (NPs) that were synthesized via chemical precipitation technique. The thermal, crystallinity, grain size, optical, magnetic and capacitive behaviors of the product were investigated by TG-DTA, XRD, SEM, HR-TEM, Uv–vis DRS, PL, Cv and vSM studies at 700 °C. The X-ray diffraction result shows the well-crystallized tetragonal structure and SEM with HR-TEM results shows the spherical morphology. The broadband visible emission band is noted in the luminescence spectrum and also the predictable band gap energy is concerning 3.94 ev. The magnetic properties were studied with the high value of magnetic moment 0.7488 × 10-3 emu g−1 at RT for SnO2 NPs displaying superparamagnetic behavior. The electrochemical performance was deliberated by cyclic voltammetry. A Specific capacitance value of 176F g−1 is obtained at a scan rate for 5 mvs−1 in SnO2NPs at 700 °C. © 2023

关键词： Magnetic moments

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