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First Coupling of AC-LGAD Sensors to a Timepix3 Chip

First Coupling of AC-LGAD Sensors to a Timepix3 Chip

2022 IEEE Nuclear Science Symposium, Medical Imaging Conference, and Room Temperature Semiconductor Detector Conference, IEEE NSS MIC RTSD 2022

作者： Barone, G. Bergmann, B. Boye, D. Burian, P. D'Amen, G. Da Vià, C. Giacomini, G. Pospisil, S. Roloff, J. Rossi, E. Smolyanskiy, P. Tricoli, A. Brookhaven National Laboratory Department of Physics UptonNY11980 United States Czech Technical University in Prague Institute of Experimental and Applied Physics Prague Czech Republic University of West Bohemia Faculty of Electrical Engineering Prague Czech Republic University of Manchester School of Physics and Astronomy Manchester United Kingdom Stony Brook University Department of Physics and Astronomy Stony BrookNY United States Brookhaven National Laboratory Instrumentation Division UptonNY11980 United States

ISBN: (纸本)9781665488723

Since their introduction in 2015, AC-coupled Low Gain Avalanche Diode (AC-LGAD) sensors have attracted wide-spread interest in the scientific community for their ability to provide high spatial resolution while keeping the excellent timing capabilities typical of standard (DC-)LGAD sensors. This is achieved in AC-LGADs because the signal from particle interactions is capacitively induced on fine-pitched electrodes placed over an insulator and is shared among multiple electrodes. AC-LGADs are therefore considered as promising candidates for future detectors such as EIC to provide 4-dimensional measurements with high resolution in both space and time dimensions. AC-LGAD sensors designed and fabricated at the Brookhaven National Laboratory (USA) have been coupled to Timepix3, a pixel detector read-out chip for X-ray imaging and particle track reconstruction developed by the Medipix3 collaboration, offering pixel-level threshold adjustment on a 256x256 pixel matrix and high precision Time-of-Arrival and Time Over Threshold measurement of incoming particles. Three different AC-LGAD strip detectors, custom designed to fit the Timepix3 chip specifications, have been bonded onto a single Timepix3 chip. Studies of the electrical coupling of the two systems and the characterization of AC-LGAD signals readout by the Timepix3 chip are discussed in this work. © 2022 IEEE.

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On the Ergodic Rate of Uplink Rate-Splitting Multiple Access

On the Ergodic Rate of Uplink Rate-Splitting Multiple Access

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IEEE Conference on Wireless Communications and Networking

作者： Athanasios P. Chrysologou Sotiris A. Tegos Panagiotis D. Diamantoulakis Nestor D. Chatzidiamantis Paschalis C. Sofotasios George K. Karagiannidis Dept. of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece Department of Computer and Communication Engineering C2PS and 6G Center Khalifa University Abu Dhabi UAE Cyber Security Systems and Applied AI Research Center Lebanese American University (LAU) Lebanon

ISBN: (数字)9798350303582

ISBN: (纸本)9798350303599

One of the principal challenges anticipated for the forthcoming sixth-generation (6G) wireless networks is the imper-ative need to design advanced multiple access techniques capable of enabling massive connectivity. In this direction, rate splitting multiple access (RSMA) has been reported as a promising approach. In this work, we investigate the ergodic rate (ER) performance of an uplink RSMA network which consists of two sources. Specifically, analytical closed-form expressions for the sources' ERs and the system ergodic sum rate (ESR) are derived under the case of perfect successive interference cancellation $(\text{pSIC})$ and perfect channel state information (pCSI) as well as under the more realistic scenario of imperfect SIC (ipSIC) and imperfect CSI (ipCSI). Furthermore, an asymptotic analysis for the high signal-to-noise ratio regime is presented, which provides useful insights into the sources' behavior in all considered cases. The accuracy of the provided analytical expressions is validated by simulation results, which not only explore how different system parameters affect the extracted expressions, but also reveal the detrimental impact of ipSIC and ipCSI on system performance.

关键词： 6G mobile communication Interference cancellation Closed-form solutions Accuracy Wireless networks System performance Simulation

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Giant Thermomechanical Bandgap engineering in Quasi-two-dimensional Tellurium

arXiv

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arXiv 2023年

作者： Hussain, Naveed Ahmed, Shehzad Tep, Hüseyin U. Ullah, Kaleem Shahzad, Khurram Wu, Hui Shcherbakov, Maxim R. Department of Electrical Engineering and Computer Science University of California Irvine IrvineCA92697 United States State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China College of Physics and Optoelectronic Engineering Shenzhen University Guangdong518060 China Micro and Nano-Technology Program School of Natural and Applied Sciences Middle East Technical University Ankara06800 Turkey Department of Electrical and Computer Engineering University of Delaware NewarkDE19711 United States Department of Physics Middle East Technical University Ankara06800 Turkey

Mechanical straining-induced bandgap modulation in two-dimensional (2D) materials has been confined to volatile and narrow modulation due to substrate slippage and poor strain transfer. We report the thermomechanical modulation of the inherent bandgap in quasi-2D tellurium nanoflakes (TeNFs) via non-volatile strain induction during hot-press synthesis. We leveraged the coefficient of thermal expansion (CTE) mismatch between TeNFs and growth substrates by maintaining a high-pressure enforced non-slip condition during thermal relaxation (623 to 300K) to achieve the optimal biaxial compressive strain of -4.6 percent in TeNFs/sapphire. This resulted in an enormous bandgap modulation of 2.3 eV, at a rate of up to ~600 meV/%, which is two-fold larger than reported modulation rate. Strained TeNFs display robust band-to-band radiative excitonic blue photoemission with an intrinsic quantum efficiency (IQE) of c.a. 79.9%, making it promising for energy efficient blue LEDs and nanolasers. Computational studies reveal that biaxial compressive strain inhibits exciton-exciton annihilation by evading van-Hove singularities, hence promoting radiative-recombination. Bandgap modulation by such nonvolatile straining is scalable to other 2D semiconductors for on-demand nano(opto)-electronics. Copyright © 2023, The Authors. All rights reserved.

关键词： Energy gap

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Comparison of Short-Range Order in GeSn Grown by Molecular Beam Epitaxy and Chemical Vapor Deposition

arXiv

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arXiv 2024年

作者： Liu, Shang Liang, Yunfan Zhao, Haochen Eldose, Nirosh M. Bae, Jin-Hee Concepcion, Omar Jin, Xiaochen Chen, Shunda Bikmukhametov, Ilias Akey, Austin Cline, Cory T. Covian, Alejandra Cuervo Wang, Xiaoxin Li, Tianshu Zeng, Yuping Buca, Dan Yu, Shui-Qing Salamo, Gregory J. Zhang, Shengbai Liu, Jifeng Thayer School of Engineering Dartmouth College HanoverNH03755 United States Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute TroyNY12180 United States Department of Electrical and Computer Engineering University of Delaware NewarkDE19716 United States Institute for Nanoscience and Engineering University of Arkansas FayettevilleAR72701 United States Forschungszentrum Juelich Juelich52428 Germany Department of Civil and Environmental Engineering George Washington University WashingtonDC20052 United States Department of Metallurgical & Materials Engineering University of Alabama TuscaloosaAL35405 United States Center for Nanoscale Systems Harvard University CambridgeMA02138 United States Department of Electrical Engineering University of Arkansas FayettevilleAR72701 United States

Atomic short-range order (SRO) in direct-bandgap GeSn for infrared photonics has recently attracted attention due to its notable impact on band structures. However, the SRO in GeSn thin films grown by different methods have hardly been compared. This paper compares SRO in GeSn thin films of similar compositions grown by molecular beam epitaxy (MBE) and chemical vapor deposition (CVD) using atom probe tomography. An ∼15% stronger preference for Sn-Sn 1st nearest neighbor (1NN) is observed in MBE GeSn than CVD GeSn for both thin film and quantum well samples with Sn composition ranging from 7 to 20%. Interestingly, samples grown by different deposition tools under the same method (either MBE or CVD) showed remarkable consistency in Sn-Sn 1NN SRO, while MBE vs. CVD showed clear differences. Supported by theoretical modeling, we consider that this difference in SRO originates from the impact of surface termination, where MBE surfaces are exposed to ultrahigh vacuum while CVD surfaces are terminated by H to a good extent. This finding not only suggests engineering surface termination or surfactants during the growth as a potential approach to control SRO in GeSn, but also provides insight into the underlying reasons for very different growth temperature between MBE and CVD that directly impact the strain relaxation behavior. Copyright © 2024, The Authors. All rights reserved.

关键词： Molecular beam epitaxy

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The Canadian RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) Mission: Exploring the Coupling of Space Weather and Terrestrial Climate

The Canadian RADiation Impacts on Climate and Atmospheric Lo...

引用

2024 Small Satellites Systems and Services Symposium, 4S 2024

作者： Mann, Ian R. Cully, C.M. Fedosejevs, R. Milling, D.K. Enno, G.A. Lipsett, M. Zee, R.E. Larouche, B.P. Rankin, R. Connors, M.G. McWilliams, K.A. Ward, W.E. Fiori, R.A. Olifer, L. Ozeke, L. Marshall, R.A. Cullen, D. Barona, D. Howarth, A.D. Yau, A.W. University of Alberta Department of Physics 11335 Saskatchewan Drive NW EdmontonABT6G 2H5 Canada University of Calgary Department of Physics & Astronomy 2500 University Drive NW CalgaryABT2N 1N4 Canada University of Alberta Department of Electrical and Computer Engineering 9211 116 St NW EdmontonABT6G 1H9 Canada University of Alberta Department of Mechanical Engineering 9211 116 St NW EdmontonABT6G 1H9 Canada Space Flight Laboratory University of Toronto Institute for Aerospace Studies 4925 Dufferin Street TorontoONM3H-5T6 Canada Athabasca University 1 University Drive AthabascaABT9S 3A3 Canada University of Saskatchewan Department of Physics & Engineering Physics 9 Campus Drive SaskatoonSKS7N 5A5 Canada University of New Brunswick Department of Physics 8 Bailey Ave FrederictonNBE3A 1H4 Canada Canadian Space Weather Forecast Centre Natural Resources Canada 2617 Anderson Rd OttawaONK1A 0E7 Canada University of Colorado at Boulder College of Engineering and Applied Science 1111 Engineering Drive 422 UCB BoulderCO80309-0422 United States

ISBN: (纸本)9781510688940

The RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) is a low-Earth orbiting Canadian small satellite mission investigating the transport of space radiation into the atmosphere, and its impact on Earth’s climate. Scheduled for launch in late 2026, the mission will launch into a polar orbit with an integrated payload comprising two back-to-back look direction High Energy Particle (RADHEPT) telescopes, an X-Ray Imager (XRI) to remote sense energetic particle precipitation using back-scattered Bremsstrahlung X-rays, and a boom mounted FluxGate Magnetometer (FGM) and Search Coil Magnetometer (SCM). Using an innovative Thomson spin-stabilized configuration, the satellite will sample the pitch angle distributions in the spin-plane twice per spin. The back-to-back RADHEPT look directions allow for a contemporaneous view of the down-going and back-scattered up-going electrons, at the same time the XRI remote-senses the related Bremsstrahlung, and the magnetometers provide in-situ magnetic signatures of a range of plasma waves. The key measurement of the pitch angle resolved energetic electron precipitation (EEP) and related back-scatter, including a resolved loss cone, will allow a detailed assessment of the energetic particle energy input to the atmosphere. Measurements of EEP, in addition to measurements of solar energetic particle (SEP) precipitation, will represent a critical data set for assessing the role of space radiation in the climate system, for example through the catalytic destruction of ozone in the middle atmosphere by NOx and HOx. Accurately quantifying the impacts of this space radiation on climate requires accurate and loss cone-resolved characterization of the flux of these precipitating energetic particles for inclusion into whole atmosphere models. The RADICALS explorer will also enable research into potentially catastrophic space-weather radiation effects on satellite infrastructure, and assess impacts on space weather-related int

关键词： Magnetometers

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Tunable Frequency Filter Based on Twisted Bilayer Photonic Crystal Slabs

Tunable Frequency Filter Based on Twisted Bilayer Photonic C...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Beicheng Lou Shanhui Fan Department of Applied Physics Stanford University Stanford CA USA Department of Electrical Engineering Ginzton Laboratory Stanford University Stanford CA USA

We introduce a tunable narrow-band-stop frequency filter based on twisted bilayer photonic crystal slabs in sub-wavelength regime. A desired lineshape is achieved by introducing additional uniform slabs. The filter ca... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Optical losses Diffraction Photonic crystals Lasers and electrooptics Slabs Electrooptical waveguides

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In Silico Demonstrations of the Impact of Wavelength and Skin Tone on Photoacoustic Breast Imaging

In Silico Demonstrations of the Impact of Wavelength and Ski...

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IEEE Symposium (IUS) Ultrasonics

作者： Guilherme S. P. Fernandes Theo Z. Pavan Muyinatu A. Lediju Bell Department of Physics FFCLRP University of Sao Paulo Brazil Department of Electrical and Computer Engineering Johns Hopkins University Baltimore MD United States Department of Biomedical Engineering Johns Hopkins University Baltimore MD United States Department of Computer Science Johns Hopkins University Baltimore MD United States

Breast photoacoustic imaging is an emerging clinical application that requires non-invasive illumination through skin. However, the melanin content of skin can introduce unwanted acoustic clutter, thereby compromising target visibility and overall image quality, which presents a significant challenge when considering the wide range of skin tones that are expected to benefit from access to the technology. To quantify the impact of this challenge, we conducted a series of multidomain photoacoustic simulations using five optical wavelengths, 18 skin constitutive pigmentations, and a previously validated 3D breast model. Three scenarios were considered: (i) the baseline scenario, in which a photoacoustic target was surrounded by breast tissue and covered by a layer of skin; (ii) the baseline scenario with the skin layer removed; and (iii) the baseline scenario with the photoacoustic target removed. Clutter levels ranged -11 dB to 11 dB with the baseline scenario. When skin was removed, this clutter was reduced by up to 39 dB and the associated target contrast improved by up to 39 dB relative to the baseline scenario, confirming skin as the primary source of clutter. When the target was removed, clutter decreased by less than 2.7 dB relative to the baseline scenario, indicating minimal to nonexistent clutter contributions from scattering due to the presence of the photoacoustic target. Future work will investigate novel system designs and protocols for patient-specific photoacoustic imaging system customizations.

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Randomized probe imaging through deep K-learning

Randomized probe imaging through deep K-learning

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Computational Optical Sensing and Imaging, COSI 2021 - Part of OSA Imaging and applied Optics Congress 2021

作者： Guo, Zhen Levitan, Abraham Barbastathis, George Comin, Riccardo Department of Electrical Engineering and Computer Science MIT CambridgeMA02139 United States Department of Physics MIT CambridgeMA02139 United States Department of Mechanical Engineering MIT CambridgeMA02139 United States

Iterative phase retrieval algorithms are time-consuming. To accelerate reconstructions for Randomized Probe Imaging (RPI), we propose deep k-learning, a neural network with attention to frequency. The associated compu... 详细信息

ISBN: (纸本)9781557528209

关键词： Probes

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Electronic Properties of Group-IV SnGe alloy topological quantum materials

Electronic Properties of Group-IV SnGe alloy topological qua...

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2021 IEEE Photonics Society Summer Topicals Meeting Series, SUM 2021

作者： Basnet, Rabindra McCarthy, Tyler T. Ju, Zheng Zhang, Yong-Hang Yu, Shui-Qing Hu, Jin Department Physics University of Arkansas FayettevilleAR72701 United States School of Electrical Computer and Energy Engineering Arizona State University TempeAZ85287 United States Department of Electrical Engineering University of Arkansas FayettevilleAR72701 United States

ISBN: (纸本)9781665416009

Electronic transport properties of GeSn as a quantum material have been studied. Superconductivity, large magnetoresistance, and quantum oscillations were observed. The combination of such transport properties in one material is rare, implying the great potential of GeSn in fundamental physics research and device applications. © 2021 IEEE.

关键词： Germanium alloys

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On Distributed Exact Sparse Linear Regression over Networks

arXiv

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arXiv 2022年

作者： Anh-Nguyen, Tu Uribe, César A. The Department of Computational and Applied Mathematics Rice University TX United States The Department of Electrical and Computer Engineering Rice University TX United States

In this work, we propose an algorithm for solving exact sparse linear regression problems over a network in a distributed manner. Particularly, we consider the problem where data is stored among different computers or agents that seek to collaboratively find a common regressor with a specified sparsity k, i.e., the L0-norm is less than or equal to k. Contrary to existing literature that uses L1regularization to approximate sparseness, we solve the problem with exact sparsity k. The main novelty in our proposal lies in showing a problem formulation with zero duality gap for which we adopt a dual approach to solve the problem in a decentralized way. This sets a foundational approach for the study of distributed optimization with explicit sparsity constraints. We show theoretically and empirically that, under appropriate assumptions, where each agent solves smaller and local integer programming problems, all agents will eventually reach a consensus on the same sparse optimal regressor. © 2022, CC BY.

关键词： Integer programming

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