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Experimental Evidence of t2g Electron-Gas Rashba Interaction Induced by Asymmetric Orbital Hybridization

Physical Review Letters 2022年第18期129卷 187203-187203页

作者： G. J. Omar W. L. Kong H. Jani M. S. Li J. Zhou Z. S. Lim S. Prakash S. W. Zeng S. Hooda T. Venkatesan Y. P. Feng S. J. Pennycook L. Shen A. Ariando Department of Physics Faculty of Science National University of Singapore Singapore 117542 Singapore Department of Mechanical Engineering National University of Singapore Singapore 117575 Singapore Department of Materials Science and Engineering National University of Singapore Singapore 117575 Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore

We report the control of Rashba spin-orbit interaction by tuning asymmetric hybridization between Ti orbitals at the LaAlO3/SrTiO3 interface. This asymmetric orbital hybridization is modulated by introducing a LaFeO3 layer between LaAlO3 and SrTiO3, which alters the Ti-O lattice polarization and traps interfacial charge carriers, resulting in a large Rashba spin-orbit effect at the interface in the absence of an external bias. This observation is verified through high-resolution electron microscopy, magnetotransport and first-principles calculations. Our results open hitherto unexplored avenues of controlling Rashba interaction to design next-generation spin orbitronics.

关键词： Magnetotransport Rashba coupling Spin-orbit coupling Complex oxides Two-dimensional electron gas Film deposition First-principles calculations High-resolution electron energy loss spectroscopy Reflection high-energy electron diffraction

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Micro-light-emitting diodes with quantum dots in display technology

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Light(science & Applications) 2020年第1期9卷 1206-1228页

作者： Zhaojun Liu Chun-Ho Lin Byung-Ryool Hyun Chin-Wei Sher Zhijian Lv Bingqing Luo Fulong Jiang Tom Wu Chih-Hsiang Ho Hao-Chung Kuo Jr-Hau He Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhenChina School of Materials Science and Engineering University of New South Wales(UNSW)2052 SydneyNSWAustralia Department of Electronic and Computer Engineering Hong Kong University of Science and TechnologyHong KongChina Department of Photonics and Institute of Electro-Optical Engineering College of Electrical and Computer EngineeringChiao Tung University30010 HsinchuTaiwanChina School of Innovation and Entrepreneurship Southern University of Science and TechnologyShenzhenChina Raysolution LLC San JoseCA 95129USA Department of Materials Science and Engineering City University of Hong KongHong KongChina

Micro-light-emitting diodes(μ-LEDs)are regarded as the cornerstone of next-generation display technology to meet the personalised demands of advanced applications,such as mobile phones,wearable watches,virtual/augmented reality,micro-projectors and ultrahigh-definition ***,as the LED chip size shrinks to below 20μm,conventional phosphor colour conversion cannot present sufficient luminance and yield to support highresolution displays due to the low absorption *** emergence of quantum dot(QD)materials is expected to fill this gap due to their remarkable photoluminescence,narrow bandwidth emission,colour tuneability,high quantum yield and nanoscale size,providing a powerful full-colour solution for μ-LED ***,we comprehensively review the latest progress concerning the implementation of μ-LEDs and QDs in display technology,including μ-LED design and fabrication,large-scale μ-LED transfer and QD full-colour *** on QD stability,patterning and deposition and challenges of μ-LED displays are also ***,we discuss the advanced applications of QD-based μ-LED displays,showing the bright future of this technology.

关键词： diodes quantum light

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Flexible Dual-Sided Polymer Microelectrode Array for Neurophysiological Recordings from an Insect Brain

Flexible Dual-Sided Polymer Microelectrode Array for Neuroph...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： Xiang Liu Simon Sanchez Yan Gong Zebin Jiang Trevor Stevens Hasan Banan Debajit Saha Wen Li Department of Physiology Neuroscience Program Michigan State University East Lansing MI USA Institute for Quantitative Health Science and Engineering East Lansing MI USA Department of Biomedical Engineering Michigan State University East Lansing MI USA Department of Electrical and Computer Engineering Michigan State University East Lansing MI USA

Despite advances in modern microelectrode technologies, designing high-density flexible microelectrode arrays (MEAs) for small insect brains remains challenging, especially when aiming for dense microelectrode configurations on flexible substrates in restricted areas (e.g., 250×100 μm 2 ). To overcome these challenges, we developed a novel dual-sided design that doubles the channel count and density of MEAs within the same spatial footprint in comparison with the single-sided counterparts. A unique folding-annealing method is introduced to craft Parylene-based flexible dual-sided density MEAs. These MEAs, with overall dimensions of 20 μm in thickness and 120-230 μm in width, are specifically tailored for the locust antenna lobe, which is the central odor processing circuitry in insects. The efficacy of the dual-sided MEA for neurophysiological sensing of odors was validated in vivo using a neural circuitry (antennal lobe) of the locust brain.

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Layered Double Hydroxide Based Self-Powered Triboelectric Sensor for Biomechanical Motions

Layered Double Hydroxide Based Self-Powered Triboelectric Se...

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International Bhurban Conference on Applied sciences & Technology, IBCAST

作者： Claudio Leonardi Muhammad Saad Ur Rahman Fatima Rehan Antonio Giodano Muhammad Ihzam Zia Mohsin Saleem Pier Gianni Medaglia Usman Khan Department of Industrial Engineering University of Rome Tor Vergata Via del Politecnico Roma Itlay School of Chemical and Materials Engineeing National University of Sciences and Technology Islamabad Pakistan School of Chemical and Materials Engineering National University of Sciences and Technology Islamabad Pakistan School of Electrical Engineering and Computer Science National University of Sciences and Technology Islamabad Pakistan School of Electrical and Electronics Engineering Chung Ang University Seoul South Korea

ISBN: (数字)9798331516680

ISBN: (纸本)9798331516697

Sensing of biomechanical motions is advantageous for biomedical health monitoring. Here, we propose a layered double hydroxide (LDH) based triboelectric sensor (TES) for monitoring biomechanical motions. The triboelectric sensor is based on initially triboelectrification between the friction pair of LDH and aluminum and subsequently electrostatic induction in an external electric circuit due to the contact-separation of the two friction layers. To realize the triboelectric sensor, ZnAl-LDH is synthesized using an in-situ hydrothermal method resulting in a nanostructured ZnAl-LDH with high surface-to-volume ratio. The triboelectric sensor is self-powered as it generates a peak-to-peak output voltage (Vo) of $\sim 11$ V across a load resistance of $1\mathrm{M}\Omega$ and a short circuit current (I SC ) of $\sim 2.5\mu\mathrm{A}$ in response to hand tapping. Since the triboelectric pulses (high voltages and very low currents) are not suited for conventional electronics, a two-stage-amplifier based interface circuit is designed to interface the sensor to a microcontroller. As proof of concept, the self-powered triboelectric sensor is interfaced with Arduino Mega 2560 microcontroller through the interface circuit. The sensorial system monitored the contact-separation induced by hand tapping and the counting information was displayed on a digital LCD. The self-powered LDH based triboelectric sensor along with the two-stage-amplifier based interface circuit provides a platform for monitoring various biomechanical motions including walking with applications in biomedical health monitoring.

关键词： Biomechanics Legged locomotion Hands Microcontrollers Surface resistance Short-circuit currents Voltage Sensors Triboelectricity Monitoring

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A Biocompatible Phenylboronic Acid-Modified Perovskite Quantum Dot for Glucose Sensing Applications

SSRN

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SSRN 2024年

作者： Chou, Hsin-Yu Shi, Wei-Yi Yen, Chao-Chun Singh, Anoop Wang, Hui-Min David Chiang, Jung-Lung Wuu, Dong-Sing Department of Materials Science and Engineering National Chung Hsing University Taichung40227 Taiwan Department of Material Science and Engineering Graduate Institute of Biomedical Engineering National Chung Hsing University Taichung40227 Taiwan Graduate Institute Prospective Technology of Electrical Engineering and Computer Science National Chin-Yi University of Technology Taichung411030 Taiwan The Innovation and Development Center of Sustainable Agriculture National Chung Hsing University Taichung40227 Taiwan Department of Applied Materials and Optoelectronic Engineering National Chi Nan University Nantou54561 Taiwan

Quantum dots (QDs) are a recently popular nanomaterial with numerous applications, including semiconductors, optoelectronics, and biomedical detection. In this study, we synthesized perovskite QDs using a wet chemical synthesis method and modified them with phenylboronic acid (PBA) to create a non-enzymatic glucose sensing device. XRD, TEM, and FTIR were utilized to demonstrate the structural changes after PBA modification and the mechanism of the glucose reaction. PL was employed to measure the luminescence changes of QD@PBA at different glucose concentrations. The luminescence of QD@PBA exhibited a high correlation with glucose concentration in the range of 1-5 mM, and the detection limit could reach 10−4 mM. On the other hand, in cell toxicity tests, QD@PBA did not demonstrate any toxic reactions or changes in cell morphology after three days of cell culture. Due to its high excitation efficiency, excellent selectivity, and biocompatibility, QD@PBA has the potential to be used as a human serum glucose sensor. Additionally, its high sensitivity, and long lifespan make it a promising candidate for further development in the study of cellular microenvironments. © 2024, The Authors. All rights reserved.

关键词： Perovskite

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Reliability of Deployed Organic Photovoltaic Modules

Reliability of Deployed Organic Photovoltaic Modules

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IEEE Conference Photovoltaic Specialists (PVSC)

作者： Hafiz K. M. Sheriff Yongxi Li Sammy Saad Stephen R. Forrest Applied Physics Program University of Michigan Ann Arbor Michigan USA Department of Electrical Engineering University of Michigan Ann Arbor Michigan USA Department of Physics University of Michigan Ann Arbor Michigan USA Department of Materials Science and Engineering University of Michigan Ann Arbor Michigan USA

ISBN: (数字)9781665464260

ISBN: (纸本)9781665475822

The commercial future of organic photovoltaics (OPVs) relies on their efficiency and reliability. Recent progress in the field has ensured the achievement of device efficiency comparable to those of commercial silicon-based photovoltaics (Si-PVs) [1]. In pursuit of reliable devices, recent works have demonstrated the intrinsic stability of both small-molecule, vacuum deposited [2] and non-fullerene acceptor (NFA) – polymer-based devices [3] under controlled laboratory conditions. The final step for outdoor deployment is therefore a demonstration of the reliability of large area OPV modules in the field, subjected to fluctuating environmental conditions such as humidity, temperature, rainfall, snow, and solar intensity. In this work, we develop a customized test facility intended for the study of the reliability of large area OPV modules deployed in outdoor environments. The facility is designed for automated in-situ measurements calibrated to 1 sun solar intensity, AM 1.5 G illumination. Initial data show the modules retain more than 95% of their initial performance for 150 h when exposed to varying solar intensities, temperature fluctuations of -2°C to 10°C, and relative humidity as high as 90%. The only significant extrinsic challenge to device stability observed was the ingress of water into the package. This is mitigated by improved packaging which utilizes polyisobutylene (PIB) encapsulation and a customized insulated glass unit (IGU).

关键词： Temperature measurement Temperature distribution Test facilities Rain Snow Humidity Solar panels Polymers Sun Thermal stability

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Slow-Wave Hybrid Magnonics

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Physical Review Letters 2024年第11期132卷 116701-116701页

作者： Jing Xu Changchun Zhong Shihao Zhuang Chen Qian Yu Jiang Amin Pishehvar Xu Han Dafei Jin Josep M. Jornet Bo Zhen Jiamian Hu Liang Jiang Xufeng Zhang Center for Nanoscale Materials Argonne National Laboratory Lemont Illinois 60439 USA Pritzker School of Molecular Engineering University of Chicago Chicago Illinois 60637 USA Department of Materials Science and Engineering University of Wisconsin—Madison Madison Wisconsin 53706 USA Department of Physics and Astronomy University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Electrical and Computer Engineering Northeastern University Boston Massachusetts 02115 USA Department of Physics and Astronomy University of Notre Dame Notre Dame Indiana 46556 USA Department of Physics Northeastern University Boston Massachusetts 02115 USA

Cavity magnonics is an emerging research area focusing on the coupling between magnons and photons. Despite its great potential for coherent information processing, it has been long restricted by the narrow interaction bandwidth. In this Letter, we theoretically propose and experimentally demonstrate a novel approach to achieve broadband photon-magnon coupling by adopting slow waves on engineered microwave waveguides. To the best of our knowledge, this is the first time that slow wave is combined with hybrid magnonics. Its unique properties promise great potentials for both fundamental research and practical applications, for instance, by deepening our understanding of the light-matter interaction in the slow wave regime and providing high-efficiency spin wave transducers. The device concept can be extended to other systems such as optomagnonics and magnomechanics, opening up new directions for hybrid magnonics.

关键词： Magnons Spin waves Surface plasmon polariton Waveguides

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Semi-supervised Large-scale Fiber Detection in Material Images with Synthetic Data

arXiv

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arXiv 2023年

作者： Fu, Lan Liu, Zhiyuan Li, Jinlong Simmons, Jeff Yu, Hongkai Wang, Song The Department of Computer Science & Engineering University of South Carolina SC United States The Department of Computer Science University of North Carolina Chapel HillNC United States The School of Information Engineering Chang'an University Xi'An China The Department of Electrical Engineering and Computer Science Cleveland State University OH United States The Materials and Manufacturing Directorate Air Force Research Lab OH United States

Accurate detection of large-scale, elliptical-shape fibers, including their parameters of center, orientation and major/minor axes, on the 2D cross-sectioned image slices is very important for characterizing the underlying cylinder 3D structures in microscopic material images. Detecting fibers in a degraded image poses a challenge to both current fiber detection and ellipse detection methods. This paper proposes a new semi-supervised deep learning method for large-scale elliptical fiber detection with synthetic data, which frees people from heavy data annotations and is robust to various kinds of image degradations. A domain adaptation strategy is utilized to reduce the domain distribution discrepancy between the synthetic data and the real data, and a new Region of Interest (RoI)-ellipse learning and a novel RoI ranking with the symmetry constraint are embedded in the proposed method. Experiments on real microscopic material images demonstrate the effectiveness of the proposed approach in large-scale fiber detection. Copyright © 2023, The Authors. All rights reserved.

关键词： Fibers

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Emerging trends in laser-cooling of Yb-doped silicate fibers

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Journal of Lightwave Technology 2025年

作者： Chen, Chun-Wei Meehan, Bailey Cahoon, Mary Ann Hawkins, Thomas W. Ballato, John Dragic, Peter D. Engholm, Magnus Boilard, Tommy Bernier, Martin Digonnet, Michel J. F. Stanford University Edward L. Ginzton Laboratory StanfordCA94305 United States Clemson University Department of Materials Science and Engineering ClemsonSC29631 United States University of Illinois Urbana-Champaign Department of Electrical and Computer Engineering UrbanaIL61801 United States Mid Sweden University Department of Engineering Mathematics and Science Education SundsvallSE-85170 Sweden QuébecQCG1V 0A6 Canada

The recent development of Yb-doped silica fibers that can be optically cooled via anti-Stokes fluorescence is fostering a new generation of fiber lasers and amplifiers that can run without external coolers. Thanks to their greatly reduced thermal loads, these devices are expected to exhibit superior properties in terms of improved power and frequency stability, and reduced thermal lensing and transverse-mode instability. This paper presents a detailed comparative study of the measured cooling properties of eight fibers with record-high Yb quenching concentrations in aluminosilicate and aluminophosphosilicate compositions. Analysis of the experimental cooling data provides valuable quantitative information about the quenching rate and background absorption of each fiber, the two parameters (besides Yb concentration) that influence the cooling performance most strongly. This study shows that aluminophosphosilicates perform better than aluminosilicates, and that very high Yb concentrations (up to 6 wt.%) can be achieved with very low quenching when the glass is co-doped with sufficient phosphorus (∼12 wt.%) and aluminum (1-7 wt.%). With the best aluminophosphosilicate composition, it is now possible to cool a fiber with a small core by as much as -250 mK at atmospheric pressure. Cooling is no longer limited by quenching, but by background absorption. Future work will focus on identifying the impurities in precursor materials responsible for this background absorption and reducing their content to lower this loss from its current 15-dB/km record value. © 2025 IEEE.

关键词： Quenching

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Review on Determinant Parameters of Genetic Algorithm for the Optimized Closed Loop Control

Review on Determinant Parameters of Genetic Algorithm for th...

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Green Energy, Computing and Sustainable Technology (GECOST), International Conference on

作者： Ing Ming Chew W. K. Wong Filbert H. Juwono Teck Chai Tiong Department of Electrical and Computer Engineering Curtin University Malaysia Miri Malaysia Computer Science Program University of Southampton Malaysia Nusajaya Malaysia Department of Electrical and Computer Engineering Curtin University Malaysia Miri Sarawak Malaysia

ISBN: (纸本)9781665486644

This paper aims to analyze the determinant parameters of Genetic Algorithm (GA) analysis for the optimized control performance of a closed control loop. The determinant parameters of GA optimization analysis cover population size (nPop), mutation rate (mu) and iteration (iter.) are analyzed and justified. The control terminology covers the Proportional-Integral-Derivative (PID) controller, a prestigious solution for industrial control applications. Besides, the research proposed stability analysis to determine the upper and lower limit settings for the optimization analysis. The research has begun with model identification, stability analysis and is followed by determining the controller tunings. The performance indexes are applied to compare the response performance of GA with deterministic controller tunings. Analysis results and discussion shows that GA with proper determinant parameters’ settings are performing better than other tuning methods in the closed loop control performance.

关键词： Analytical models Terminology Sociology Process control Stability analysis Performance analysis Statistics

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