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IEEE Conference on Nanotechnology

作者： Pilkyung Moon Euijoon Yoon J.-P. Leburton Compound Semiconductor Epitaxy Laboratory School of Materials Science and Engineering Seoul National University Seoul South Korea Department of Electrical and Computer Engineering Beckman Institute for Advanced Science and Technology University of Illinois Urbana-Champaign Urbana-Champaign IL USA

ISBN: (纸本)0780391993

We investigate spatial overlap of electron wave functions in three laterally coupled self-assembled quantum structures using valence force field method and eight-band k/spl middot/p method. Strain profile, piezoelectric potential, band edge energy, electron and hole distributions and optical transition strength for interband transition are calculated. Bonding state, anti-bonding state, mixing of ground and excited states and the changes in selection rules are obtained by numerical simulation.

关键词： Quantum dots US department of Transportation Capacitive sensors Quantum computing materials science and technology Wave functions Electron optics Optical mixing Numerical simulation Nanotechnology

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Reconfigurable Parfocal Zoom Metalens

Reconfigurable Parfocal Zoom Metalens

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Conference on Lasers and Electro-Optics (CLEO)

作者： Mikhail Shalaginov Fan Yang Sensong An Hung-I Lin Katherine Stoll Myungkoo Kang Anuradha Agarwal Kathleen Richardson Clara Rivero-Baleine Hualiang Zhang Juejun Hu Tian Gu Department of Materials Science & Engineering Massachusetts Institute of Technology Cambridge MA USA Department of Materials Science and Engineering The College of Optics & Photonics University of Central Florida Orlando FL USA Materials Research Laboratory Massachusetts Institute of Technology Cambridge MA USA Missiles and Fire Control Lockheed Martin Corporation Orlando FL USA Department of Electrical & Computer Engineering University of Massachusetts Lowell Lowell MA USA

We designed and experimentally realized a non-mechanically tuned metalens capable of performing ×10 zoom while maintaining focus. The metalens consists of two dielectric metasurfaces made of low-loss optical phas... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Lasers and electrooptics Metasurfaces Optical materials Dielectrics Laser tuning Electrooptical waveguides

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High temperature elastic constants of langatate from RUS measurements up to 1100°C

High temperature elastic constants of langatate from RUS mea...

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IEEE Symposium (IUS) Ultrasonics

作者： P.M. Davulis A. Shyam E. Lara-Curzio M. Pereira da Cunha Electrical and Computer Engineering Department Laboratory for Surface Science and Technology University of Maine Orono ME USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN USA

This paper reports on the langatate (LGT) elastic constants and their temperature coefficients measured from room temperature (25degC) to 1100degC using resonant ultrasound spectroscopy (RUS). The constants were extracted by iteratively fitting the resonant peaks with those calculated by Lagrangian mechanics at each temperature where the RUS measurements were taken. In addition, the RUS technique was used to extract the elastic and piezoelectric constants in the 25degC to 120degC temperature range. The extraction of LGT elastic constants up to 1100degC presented in this paper represents a critical step towards the design and fabrication of LGT acoustic wave devices for high temperature and harsh environment applications.

关键词： Ultrasonic variables measurement Temperature measurement Resonance Ultrasonic imaging Spectroscopy Lagrangian functions Acoustic measurements Mechanical variables measurement Temperature distribution Fabrication

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Spin injection across the Fe/GaAs interface: Role of interfacial ordering

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Physical Review B 2009年第20期80卷 201309(R)-201309(R)页

作者： B. D. Schultz N. Marom D. Naveh X. Lou C. Adelmann J. Strand P. A. Crowell L. Kronik C. J. Palmstrøm International Technology Center Raleigh North Carolina 27617 USA Department of Materials and Interfaces Weizmann Institute of Science Rehovoth 76100 Israel School of Physics and Astronomy University of Minnesota Minneapolis Minnesota 55455 USA Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis Minnesota 55455 USA Electrical and Computer Engineering and Materials University of California–Santa Barbara Santa Barbara California 93106 USA

Spin injection efficiency is shown to strongly depend on the interfacial structure between Fe contacts and AlxGa1−xAs in spin-based light emitting diodes. Both the magnitude and sign of the injected carriers are dependent on the atomic structure of the contacts and can be controlled through changes in temperature both during and following growth. We propose that the observed dependence is due to phase formation resulting from Fe/GaAs interfacial reactions. This proposed mechanism is consistent with electronic structure calculations, which show that thin layers of DO3 Fe3Ga at the Fe/GaAs interface can produce the observed sign reversals in the spin polarization of injected carriers.

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Underlying magnetization responses of magnetic nanoparticles in assemblies

arXiv

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arXiv 2020年

作者： Kouhpanji, Mohammad Reza Zamani Visscher, Pieter B. Stadler, Bethanie J. H. Department of Electrical and Computer Engineering University of Minnesota MinneapolisMN United States Department of Biomedical Engineering University of Minnesota MinneapolisMN United States Department of Chemical Engineering and Materials Science University of Minnesota MinneapolisMN United States Department of Physics and Astronomy University of Alabama United States

Magnetic nanoparticles (MNPs) have been proposed as an ultimate solution for diverse applications including nanomedicine and logic devices over decades. However, none has emerged revolutionary because realizing their magnetization response in an assembly is, surprisingly, still elusive. We employ our fast and universal magnetic characterization method, called the projection method, to underlie the reversible (irreversible) magnetization response of several assemblies. We then illustrate how the reversible (irreversible) magnetization response is correlated to the intrinsic properties (the coercivity and interaction fields) of the MNPs in an assembly. Our experimental observations indicate that the reversible magnetization does not solely depend on the interaction field, but it is indeed a function of the interaction field to coercivity ratio. Furthermore, for large porosities, the interaction field linearly changes with the porosity highlighting the predominant effects of dipole-dipole interactions on the interaction fields. However, at low porosities, the interaction field shows a nonlinear relationship with the porosity indicating the dipole fluctuations effects dominantly determine the interaction fields. Copyright © 2020, The Authors. All rights reserved.

关键词： Porosity

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Wireless Hearing Aids System Simulation

Wireless Hearing Aids System Simulation

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Asilomar Conference on Signals, Systems & computers

作者： H.K. Garg Tang Bin Zhang Liang R.S. Rana Department of Electrical & Computer Engineering National University of Singapore Singapore 11 Science Park Road Institute of Microelectronics Singapore Graduate Program in Bioengineering National University of Singapore Singapore

Although wireless hearing aid systems have been proposed by several research groups, no viable whole-system simulation results have been reported so far for better evaluation of this advanced hearing device. In this paper, a system-level simulation using ADStrade is presented based on one of the typical wireless hearing aid architecture. The results show that the wireless hearing aid system function can be simulated and verified. And from these results, we can get a very promising performance which can be used for further design

关键词： Hearing aids Auditory system Circuit simulation Radio frequency Noise cancellation Mathematical model Costs RF signals Signal processing Computational modeling

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Wearable Ultrasound Devices for Continuous Health Monitoring: Current and Future Prospects

Wearable Ultrasound Devices for Continuous Health Monitoring...

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IEEE International Energy Conference and Exhibition (EnergyCon)

作者： Najmath Ottakath Somaya Al-maadeed Ahmed Bouridane Muhammad E.H Chowdhury Kishor Kumar Sadasivuni Department of Computer Science and Engineering Qatar University Doha Qatar Center of Data Analytics and Cybersecurity University of Sharjah Sharjah UAE Department of Electrical Engineering Qatar University Doha Qatar Center for Advanced Materials Qatar University Doha Qatar

Advancements in wearable electronics and portable sensors have enabled long-term and real-time health monitoring. Among these advancements, wearable ultrasound devices have garnered attention due to their portability, ease of use, and ability to penetrate deep tissues in the human body. The images generated by these devices can be harnessed for computer vision tasks, providing valuable insights into an individual's health status even during physical activity. This paper explores the design of such wearable ultrasound imagers, surveys their current applications, and offers insights into future prospects, including visual image processing and real-time analysis. The study also addresses the challenges of using wearable ultrasound for long-term health monitoring, emphasizing the need for ongoing innovation and research.

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Photonic crystal biosensor with in-situ synthesized DNA probes for enhanced sensitivity

Photonic crystal biosensor with in-situ synthesized DNA prob...

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IEEE Photonics Conference (IPC)

作者： S. Hu Y. Zhao S. T. Retterer I. I. Kravchenko S. M. Weiss Department of Physics and Astronomy Vanderbilt University Nashville TN USA Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN USA Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN USA Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

We report on a nearly 8-fold increase in multi-hole defect photonic crystal biosensor response by incorporating insitu synthesis of DNA probes, as compared to the conventional functionalization method employing pre-sy... 详细信息

关键词： Probes Biosensors Photonic crystals DNA Optical surface waves Magnetohydrodynamics Silicon

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Proton-irradiation-immune electronics implemented with two-dimensional charge-density-wave devices

arXiv

引用

arXiv 2019年

作者： Geremew, A. Kargar, F. Zhang, E.X. Zhao, S.E. Aytan, E. Bloodgood, M.A. Salguero, T.T. Rumyantsev, S. Fedoseyev, A. Fleetwood, D.M. Balandin, A.A. Nano-Device Laboratory Department of Electrical and Computer Engineering Materials Science and Engineering Program University of California RiversideCA92521 United States Department of Electrical Engineering and Computer Science Vanderbilt University NashvilleTN37235 United States Department of Chemistry University of Georgia AthensGA30602 United States Center for Terahertz Research and Applications Institute of High-Pressure Physics Polish Academy of Sciences Warsaw01-142 Poland Ultra Quantum Inc. HuntsvilleAL35758 United States

Proton radiation damage is an important failure mechanism for electronic devices in near-Earth orbits, deep space and high energy physics facilities1-4. Protons can cause ionizing damage and atomic displacements, resulting in device degradation and malfunction5-10. Shielding of electronics increases the weight and cost of the systems but does not eliminate destructive single events produced by energetic protons 8,10. Modern electronics based on semiconductors - even those specially designed for radiation hardness - remain highly susceptible to proton damage. Here we demonstrate that room temperature (RT) charge-density-wave (CDW) devices with quasi-two-dimensional (2D) 1T-TaS2channels show remarkable immunity to bombardment with 1.8 MeV protons to a fluence of at least 1014H+cm-2. Current-voltage I-V characteristics of these 2D CDW devices do not change as a result of proton irradiation, in striking contrast to most conventional semiconductor devices or other 2D devices. Only negligible changes are found in the low-frequency noise spectra. The radiation immunity of these "all-metallic" CDW devices can be attributed to their two-terminal design, quasi-2D nature of the active channel, and high concentration of charge carriers in the utilized CDW phases. Such devices, capable of operating over a wide temperature range, can constitute a crucial segment of future electronics for space, particle accelerator and other radiation environments. Copyright © 2019, The Authors. All rights reserved.

关键词： Failure (mechanical)

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Topological Magnonic Properties of an Antiferromagnetic Chain

arXiv

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arXiv 2024年

作者： Debnath, Topojit Soundararaj, Shri Hari Kwon, Sohee Balandin, Alexander A. Lake, Roger K. Department of Electrical and Computer Engineering University of California RiversideCA92521 United States University of California RiversideCA92521 United States Department of Materials Science and Engineering University of California Los AngelesCA90095 United States

The magnonic excitations of a dimerized, one-dimensional, antiferromagnetic chain can be trivial or topological depending on the signs and magnitudes of the alternating exchange couplings and the anisotropy. The topological phase that occurs when the signs of the two different exchange couplings alternate is qualitatively different from that of the Su-Schrieffer-Heeger model. A material that may exhibit these properties is the quasi-one-dimensional material MoI3 that consists of dimerized chains weakly coupled to adjacent chains. The magnetic ground state and its excitations are analyzed both analytically and numerically using exchange and anisotropy parameters extracted from density functional theory calculations. Copyright © 2024, The Authors. All rights reserved.

关键词： Anisotropy

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