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46th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2024

作者： Wu, Yupeng Hernández, Miguel Figueroa Lei, Tian Jayakumar, Siddarth Lalapet, Rohan R. Joshi-Imre, Alexandra Orazem, Mark E. Otto, Kevin J. Cogan, Stuart F. The University of Texas at Dallas Department of Material Science Engineering RichardsonTX United States The University of Texas at Dallas Department of Bioengineering RichardsonTX United States The University of Texas at Dallas Department of Electrical & Computer Engineering RichardsonTX United States The University of Texas at Dallas Office of Research and Innovation RichardsonTX United States University of Florida Department of Chemical Engineering GainesvilleFL United States University of Florida J. Crayton Pruitt Family Department of Biomedical Engineering GainesvilleFL United States

ISBN: (纸本)9798350371499

Recently, there has been a growing interest in ruthenium oxide (RuOx) as an alternative mixed-conductor oxide to SIROF as an electrode coating. RuOx is recognized as a faradic charge-injection coating with high CSCc, long-term pulsing stability, and low impedance. We examined how the structural properties of sputter-deposited RuOx influence its electrochemical performance as an electrode coating for neural stimulation and recording. Thin film RuOx was deposited under various pressures: 5 mTorr, 15 mTorr, 30 mTorr, and 60 mTorr on wafer-based planar test structures. Electrochemical characterizations, including electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and voltage transient (VT), were employed. The structure of RuOx films was characterized by scanning electron microscope (SEM). Our findings revealed that the sputtering pressure significantly influences the growth of the RuOx film, subsequently affecting its electrochemical performance. The results indicate that the electrochemical performance of RuOx can be optimized by adjusting the deposition conditions to achieve a favorable balance between electronic and ionic *** Relevance - This research underscores the potential for optimizing the structural properties of RuOx to enhance its electrochemical capabilities for neural stimulation and recording. © 2024 IEEE.

关键词： Cyclic voltammetry

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Modifying Crystal Symmetries via Shear Distortion

Modifying Crystal Symmetries via Shear Distortion

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Quantum Computing and engineering (QCE), IEEE International Conference on

作者： Sarah Edwards Qixuan Lin Morgan Sherer Elliott Rosenberg Jiun-Haw Chu Arthur Barnard Physics Department University of Washington Seattle Washington Electrical and Computer Engineering Department University of Washington Seattle Washington Material Science Department University of Washington Seattle Washington

Strain is a powerful tool for studying how electric and magnetic phenomena arise from crystal symmetries and creating flexible (no pun intended) solid-state devices for a wide range of practical applications, including efficient spin-based memory storage and tunable quantum dots. The ability to finely tune symmetries within crystal lattices means a large degree of control over the optical transitions of the lattice, magnetic ordering, and spin domain population. While many methods for applying lateral strain and pressure have been well documented, the ability to reliably apply small-scale shear strain in physics research applications is uncommon. The goal for this project is to fill that vacuum by building and benchmarking a device which applies precise shear strain to a single crystal and interfaces directly with Quantum Design's PPMS (Physical Property Measurement System). For the first experiment run in this cell, an investigation of the strain-switchable antifer-romagnetic ordering of FeTe has been selected. This material displays a spontaneous monoclinic structural distortion as it enters a double-stripe antiferromagnetic phase, which may couple to applied shear strain and serve as both proof of concept of our device and an interesting investigation into the Eg elastoresistivity of FeTe in its own right. This poster discusses design considerations, construction details, and anticipated and preliminary measurements of FeTe.

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Towards Autonomous Shooting Rover via Situation Aware Visual-Perception and Dynamic Action Execution

Towards Autonomous Shooting Rover via Situation Aware Visual...

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IEEE/SICE International Symposium on System Integration

作者： Shreenaga Chikoti Shubham Yukkta Seelam Aditya Jain Nishi Mehta Sidhartha Watsa Ayush Ranjan L. Behera Department of Mathematics and Scientific Computing Indian Institute of Technology Kanpur Department of Material Science and Engineering Indian Institute of Technology Kanpur Department of Electrical Engineering Indian Institute of Technology Kanpur Department of Computer Science and Engineering Indian Institute of Technology Kanpur Department of Mechanical Engineering Indian Institute of Technology Kanpur

In this system paper, we present our approach to the DJI Robomaster AI Challenge, 2022 where our team ERA-IITK was ranked 3 rd worldwide among 83 teams. We primarily focus on system hardware design and algorithmic components to achieve full autonomy. We first detail the hardware infrastructure, including intricate details on sensors and communication setup. Then we comprehensively describe our algorithmic pipeline and a state machine based on them to realize an autonomous system. Our major novelty is the high-speed and accurate visual perception module for target detection, and high-speed self-localization to maximize the likelihood of a target being shot. Our research endeavor in this paper can serve as a foundation for more complex systems and holds immense potential for various real-world applications.

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Free-electron-based interferometry for enhanced, phase-resolved near-field imaging

Free-electron-based interferometry for enhanced, phase-resol...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Tomer Bucher Ron Ruimy Raphael Dahan Shai Tsesses Guy Bartal Giovanni Maria Vanacore Ido Kaminer Andrew and Erna Viterbi Department of Electrical & Computer Engineering Technion-Israel Institute of Technology Haifa Israel Department of Material Science University of Milano-Bicocca Milano Italy

We propose a novel scheme for phase-resolved near-field imaging using free electrons. Our scheme relies on algorithmic extraction of the complex-valued electron-field coupling. Pre-shaping the electron wavefunction fa... 详细信息

ISBN: (纸本)9781957171258

关键词： Electron microscopy Near field microscopy Near field scanning optical microscopy Optical microscopy Phase modulation Transmission electron microscopy

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Fabric computing: Concepts, opportunities, and challenges

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The Innovation 2022年第6期3卷 67-76页

作者： Min Chen Jia Liu Pan Li Hamid Gharavi Yixue Hao Jingyu Ouyang Jiayu Hu Long Hu Chong Hou Iztok Humar Lei Wei Guang-Zhong Yang Guangming Tao Wuhan National Laboratory for Optoelectronics and School of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China National Institute of Standards and Technology(NIST) GaithersburgMD 20899-8920USA School of Optics and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Faculty of Electrical Engineering University of LjubljanaTrzaska cesta 251000 LjubljanaSlovenia School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore Medical Robotics Institute Shanghai Jiao Tong UniversityShanghai 200030China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

With the advent of the Internet of Everything,people can easily interact with their environments *** idea of pervasive computing is becoming a reality,but due to the inconvenience of carrying silicon-based entities and a lack of fine-grained sensing capabilities for human-computer interaction,it is difficult to ensure comfort,esthetics,and privacy in smart *** by the rapid developments in intelligent fabric technology in the post-Moore era,we propose a novel computing approach that creates a paradigm shift driven by fabric computing and advocate a new concept of non-chip sensing in living *** discuss the core notion and benefits of fabric computing,including its implementation,challenges,and future research opportunities.

关键词： computing computer smart

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Design and Optimization of the Porous Metamaterial EM Absorbers in X-band

Design and Optimization of the Porous Metamaterial EM Absorb...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： Kanat Anurakparadorn Alan Taub Eric Michielssen Macromolecular Science and Engineering Program Department of Material Science and Engineering University of Michigan Ann Arbor Michigan USA Department of Mechanical Engineering University of Michigan Ann Arbor Michigan USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan USA

A strategy that combines experiment and simulation to design and optimize electromagnetic (EM) metamaterial absorbers containing a periodic porous structure is described. The approach provides the ability to produce absorbers that meet multiple user-specified objectives. Using the measured intrinsic properties of the baseline materials as an input to EM-field based computational modelling and optimization, absorption by the studied metamaterials measured by their reflection loss (RL) increases significantly. The resulting metamaterials have the potential for lower cost and lighter weight while providing greater protection than traditional metal gaskets and foams.

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Ultrafast dynamics of wavelength-sensitive magnons in unconventional compensated semiconducting antiferromagnet

arXiv

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arXiv 2024年

作者： Huang, Hanshen Qu, Tao Cheng, Yang Tai, Lixuan Eckberg, Christopher Pan, Quanjun Alrasheed, Abdullah Chong, Su Kong Dai, Bingqian Li, Yaochen Shu, Qingyuan Yang, Chao-Yao Yu, Jie-Xiang Yin, Gen Wang, Kang L. Department of Electrical and Computer Engineering Department of Physics and Astronomy Department of Material Science and Engineering University of California Los AngelesCA90095 United States Department of Material Science and Engineering National Yang Ming Chiao Tong University Hsinchu300044 Taiwan School of Physical Science and Technology Soochow University Suzhou215006 China Department of Physics Georgetown University WashingtonDC20057 United States

Antiferromagnet is a promising candidate for the next generation spintronic devices, benefiting from its ultrafast dynamics and spontaneous zero stray field. However, the understanding of their ultrafast spin behaviors is lacking due to the challenges of controlling/detecting the quenched net magnetization. Unconventional compensated semiconducting antiferromagnets present strong time-reversal symmetry breaking, spin splitting in the momentum space, and suitable bandgap for optical control/detection. Thus, it is a powerful platform to uncover the ultrafast dynamics of antiferromagnets. Here, we show an exotic wavelength-dependent spin dynamic in the unconventional compensated semiconducting antiferromagnet α -MnTe via time-resolved quadratic magneto-optical Kerr effect measurement, where the probing photon energy of the laser matches its bandgap. This direct excitation and detection of distinct magnon modes reveal varying spin behaviors and time characteristics in a broad temperature range. It originates from the spins triggered at different bands of electronic structures and is depicted in an energy transfer model among electrons, phonons, and magnons. Our study of exotic optical properties in this unconventional semiconducting antiferromagnet fulfills the missing information of spin evolution in the time domain and paves the way for its utilization in ultrafast spintronic devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Energy gap

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Extraction of Mobility from Quantum Transport Calculations of Type-II Superlattices

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Physical Review Applied 2023年第4期19卷 044045-044045页

作者： John Glennon Francesco Bertazzi Alberto Tibaldi Enrico Bellotti Division of Material Science and Engineering (MSE) Boston University Boston Massachusetts 02215 USA Department of Electronics and Telecommunications (DET) Politecnico di Torino and IEIIT-CNR Torino 10129 Italy Department of Electrical and Computer Engineering (ECE) Boston University Boston Massachusetts 02215 USA

Type-II superlattices (T2SLs) are being investigated as an alternative to traditional bulk materials in infrared photodetectors due to predicted fundamental advantages. Subject to significant quantum effects, these materials require the use of quantum transport methodologies, such as the nonequilibrium Green’s function (NEGF) formalism to fully capture the relevant physics without uncontrolled approximations. Carrier mobility is a useful parameter that affects carrier collection in photodetectors. This work investigates the application of mobility extraction methodologies from quantum transport simulations in the case of T2SLs exemplified using an InAs/GaSb midwave structure. In a resistive region, the average velocity can be used to calculate an apparent mobility that incorporates both diffusive and ballistic effects. However, the validity of this mobility for predicting device properties is limited to cases of diffusive limited transport or when the entire device can be included in the simulation domain. Two methods that have been proposed to extract diffusive limited mobility, one based on approximating the ballistic component of transport and the other which considers the scaling of resistance with simulation size, were also studied. In particular, the resistance scaling approach is demonstrated to be the method most physically relevant to predicting macroscopic transport. We present a method for calculating the mobility from resistance scaling considerations that accounts for carrier density variation between calculations, which is particularly relevant in the case of electrons. Finally, we comment on the implications of applying the different mobility extraction methodologies to device property predictions. The conclusions of this study are not limited to T2SLs, and may be generally relevant to quantum transport mobility studies.

关键词： Ballistic transport Carrier dynamics electrical conductivity Optoelectronics Quantum transport III-V semiconductors Superlattices Nonequilibrium Green's function

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In-situ Patterned Damage-Free Etching of 3-Dimensional Structures in β-Ga2O3 using Triethylgallium

arXiv

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arXiv 2024年

作者： Das, Nabasindhu Alema, Fikadu Brand, William Katta, Abishek Gilankar, Advait Osinsky, Andrei Kalarickal, Nidhin Kurian Department of Electrical and Computer Engineering Arizona State University AZ88514 United States Department of Material Science & Engineering Arizona State University AZ88514 United States Agnitron Technology Incorporation ChanhassenMN55317 United States

In this work, we report on the anisotropic etching characteristics of β-Ga2O3 using triethylgallium (TEGa) performed in-situ within an MOCVD chamber. At sufficiently high substrate temperature, TEGa can act as a strong etchant for β-Ga2O3 utilizing the suboxide reaction between Ga and Ga2O3 (4 Ga(s) + Ga2O3 (s) → 3Ga2O (g)). We observe that due to monoclinic crystal structure of β-Ga2O3, TEGa etching on both (010) and (001) substrates is highly anisotropic in nature, both in terms of sidewall roughness and lateral etch rate. Smooth sidewalls are only obtained along crystal orientations that minimize sidewall surface energy. Utilizing this technique we also demonstrate deep sub-micron fins with smooth sidewalls and high aspect ratios. Furthermore, we also demonstrate the damage free nature of TEGa etching by fabricating Schottky diodes on the etched surface which display no change in net donor concentration. © 2024, CC BY.

关键词： Aspect ratio

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Inverse Design with Dynamic Mode Decomposition

arXiv

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arXiv 2025年

作者： Zhu, Yunpeng Cheng, Liangliang Jing, Anping Huo, Hanyu Lang, Ziqiang Zhang, Bo Kutz, J. Nathan School of Engineering and Material Science Queen Mary University of London LondonE1 4NS United Kingdom ENTEG Faculty of Science and Engineering University of Groningen Groningen9747 AG Netherlands School of Mechanical Engineering Ningxia University Yinchuan750021 China School of Chemistry and Material Science University of Science and Technology of China Hefei230026 China School of Electrical and Electronic Engineering The University of Sheffield SheffieldS10 2TN United Kingdom Department of Applied Mathematics and Electrical and Computer Engineering University of Washington SeattleWA United States

We introduce a computationally efficient method for the automation of inverse design in science and engineering. Based on simple least-square regression, the underlying dynamic mode decomposition algorithm can be used to construct a low-rank subspace spanning multiple experiments in parameter space. The proposed inverse design dynamic mode composition (ID-DMD) algorithm leverages the computed low-dimensional subspace to enable fast digital design and optimization on laptop-level computing, including the potential to prescribe the dynamics themselves. Moreover, the method is robust to noise, physically interpretable, and can provide uncertainty quantification metrics. The architecture can also efficiently scale to large-scale design problems using randomized algorithms in the ID-DMD. The simplicity of the method and its implementation are highly attractive in practice, and the ID-DMD has been demonstrated to be an order of magnitude more accurate than competing methods while simultaneously being 3-5 orders faster on challenging engineering design problems ranging from structural vibrations to fluid dynamics. Due to its speed, robustness, interpretability, and ease-of-use, ID-DMD in comparison with other leading machine learning methods represents a significant advancement in data-driven methods for inverse design and optimization, promising a paradigm shift in how to approach inverse design in *** Codes 37M05, 37M10, 37M21 Copyright © 2025, The Authors. All rights reserved.

关键词： Dynamic mode decomposition

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