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Conference on Lasers and Electro-Optics (CLEO)

作者： Emma DaAngelis Mohamed Yaseen Noor Maxwell Weiss Carmen Menoni Enam Chowdhury Department of Materials Science and Engineering The Ohio State University Columbus Ohio USA Electrical and Computer Engineering Department Colorado State University Fort Collins CO USA XUV Lasers Inc. Fort Collins CO USA

Two layer anti-reflection coatings (Air/SiO 2 /HfSiO/substrate. vs Air/SiO 2 /Hf-SiO 2 nanolaminates/substrate) were tested with p-polarized 77 fs 1030 nm laser pulses. Damage threshold fluence of the sample with nan... 详细信息

ISBN: (纸本)9798350369311

关键词： Power lasers Coatings Ultrafast optics Laser pulses Electro-optical waveguides

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Optimizing the Ferroelectric Properties of Hf1-xZrxO2 Films via Crystal Orientation

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ACS Applied Electronic materials 2023年第2期5卷 1114-1122页

作者： Teng, Chih-Yu Cheng, Chia-Chieh Li, Kai-Shin Hu, Chenming Lin, Jhih-Min Lin, Bi-Hsuan Tang, Mau-Tsu Tseng, Yuan-Chieh Department of Materials Science & Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Taiwan Semiconductor Research Institute Hsinchu30010 Taiwan Intelligent Semiconductor Nano-system Technology Research Center National Yang Ming Chiao Tung University 1001 Ta Hsueh Road Hsinchu30010 Taiwan Department of Electrical Engineering and Computer Sciences University of California BerkeleyCA94720 United States National Synchrotron Radiation Research Center Hsinchu30076 Taiwan

This study exploits the coupling of crystallographic and ferroelectric (FE) properties in an effort to enhance the FE performance of Hf1-xZrxO2 (HZO). The proposed scheme involved optimizing the orientation of orthorhombic (O)-phase crystals along the preferred polarization axis by applying an electric pulse during annealing. The proposed electric pulse annealing (EPA) process reduced the need for wake-up treatment;however, it imposed limited changes on the amount of the O-phase and leakage performance, compared with rapid thermal annealing (RTA). Excessively high EPA doses induced an O → M (monoclinic) phase transformation, which sacrificed FE polarization but preserved the wake-up-free-like properties. Our results demonstrate that optimizing the orientation of polycrystalline O-phase may be as important as maximizing the quantity of O-phase for HZO applications. © 2023 American Chemical Society.

关键词： Ferroelectricity

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Wireless,multimodal sensors for continuous measurement of pressure,temperature,and hydration of patients in wheelchair

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npj Flexible Electronics 2023年第1期7卷 479-493页

作者： Seokjoo Cho Hyeonseok Han Hyunwoo Park Sung-Uk Lee Jae-Hwan Kim Sung Woo Jeon Mengqiu Wang Raudel Avila Zhaoqian Xi Kabseok Ko Minsu Park Jungyup Lee Myungwoo Choi Je-Sang Lee Weon Gi Min Byeong-Ju Lee Soyeong Lee Jungrak Choi Jimin Gu Jaeho Park Min Seong Kim Junseong Ahn Osman Gul Chankyu Han Gihun Lee Seunghwan Kim Kyuyoung Kim Jeonghyun Kim Chang-Mo Kang Jahyun Koo Sung Soo Kwak Sungbong Kim Dong Yun Choi Seokwoo Jeon Hyung Jin Sung Yong Bae Park Minkyu Je Young Tae Cho Yong Suk Oh Inkyu Park Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea School of Electrical Engineering Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Advanced 3D Printing Technology Development Division Korea Atomic Energy Research InstituteDaejeon 34057Republic of Korea Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian 116023P.R.China Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA DUT-BSU Joint Institute Dalian University of TechnologyDalian 116023China Ningbo Institute of Dalian University of Technology Ningbo 315016China Department of Electronics Engineering Kangwon National UniversityChuncheon 24341Republic of Korea Querrey-Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIL 60208USA Sibel Health Inc NilesIL 60714USA Department of Materials Science and Engineering KAIST Institute for The Nanocentury(KINC)Korea Advanced Institute of Science and TechnologyDaejeon 34141Republic of Korea Department of Rehabilitation Medicine Gimhae Hansol Rehabilitation&Convalescent HospitalGimhae 50924Republic of Korea Department of planning and development Gimhae Hansol Rehabilitation&Convalescent HospitalGimhae 50924Republic of Korea Department of rehabilitation medicine Pusan national university hospitalBusan 49241Republic of Korea Department of AI Convergence Network Ajou UniversitySuwon 16499Republic of Korea Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897Republic of Korea Korea Photonics Technology Institute Gwangju 61007Republic of Korea School of Biomedical Engineering Korea UniversitySeoul 02841Republic of Korea Interdisciplinary Program in Precision Public Health Korea UniversitySeoul 02841Republic of Korea Center

Individuals who are unable to walk independently spend most of the day in a *** population is at high risk for developing pressure injuries caused by ***,early diagnosis and prevention of these injuries still remain ***,we introduce battery-free,wireless,multimodal sensors and a movable system for continuous measurement of pressure,temperature,and hydration at skin *** device design includes a crack-activated pressure sensor with nanoscale encapsulations for enhanced sensitivity,a temperature sensor for measuring skin temperature,and a galvanic skin response sensor for measuring skin hydration *** movable system enables power harvesting,and data communication to multiple wireless devices mounted at skin-cushion interfaces of wheelchair users over full body *** evaluations and numerical simulations of the devices,together with clinical trials for wheelchair patients,demonstrate the feasibility and stability of the sensor system for preventing pressure injuries caused by sitting.

关键词： injuries modal mounted

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Strategies to anode protection in lithium metal battery:A review

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InfoMat 2021年第12期3卷 1333-1363页

作者： Jiawei Li Zhao Kong Xiaoxi Liu Bocong Zheng Qi Hua Fan Elias Garratt Thomas Schuelke Keliang Wang Hui Xu Hong Jin Xi'an Jiaotong University Suzhou AcademySuzhouChina Nano Science and Technology Institute University of Science and Technology of ChinaSuzhouChina College of Materials Science and Engineering Huaqiao UniversityXiamenChina Fraunhofer USA Inc.Center MidwestMichigan State UniversityEast LansingMichiganUSA Department of Electrical Engineering and Computer Engineering Michigan State University East LansingMichiganUSA Department of Chemical Engineering and Materials Science Michigan State University East LansingMichiganUSA

Lithium metal batteries(LMBs)are considered the most promising energy stor-age devices for applications such as electrical vehicles owing to its tremendous theoretical capacity(3860 mAh g−1).However,the serious safety issues and poor cycling performance caused by the dendritic crystal growth during deposi-tion are concerned for any rechargeable batteries with a lithium metal *** make widespread adoption a possibility,considerable efforts have been devoted to suppressing lithium(Li)dendrite *** this review,the recent strategies to developing dendrite free Li anode,including constructing an artifi-cial solid electrolyte interface,current collector modification,separator film improvement,and electrolyte additive,are *** merits and short-comings for different strategies are reviewed and a general summary and per-spective on the next generation rechargeable batteries are presented.

关键词： dendrite Li metal batteries solid electrolyte interface

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Phonon-Assisted Intertube Electronic Transport in an Armchair Carbon Nanotube Film

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Physical Review Letters 2023年第17期130卷 176303-176303页

作者： Davoud Adinehloo Weilu Gao Ali Mojibpour Junichiro Kono Vasili Perebeinos Department of Electrical Engineering University at Buffalo Buffalo New York 14228 USA Department of Electrical and Computer Engineering University of Utah Salt Lake City Utah 84112 USA Department of Electrical and Computer Engineering Rice University Houston Texas 77005 USA Department of Physics and Astronomy Rice University Houston Texas 77005 USA Department of Materials Science and NanoEngineering Rice University Houston Texas 77005 USA The Smalley-Curl Institute Rice University Houston Texas 77005 USA

The electrical conductivity of a macroscopic assembly of nanomaterials is determined through a complex interplay of electronic transport within and between constituent nano-objects. Phonons play dual roles in this situation: their increased populations tend to reduce the conductivity via electron scattering, while they can boost the conductivity by assisting electrons to propagate through the potential-energy landscape. We identified a phonon-assisted coherent electron transport process between neighboring nanotubes in temperature-dependent conductivity measurements on a macroscopic film of armchair single-wall carbon nanotubes. Through atomistic modeling of electronic states and calculations of both electronic and phonon-assisted junction conductances, we conclude that phonon-assisted conductance is the dominant mechanism for observed high-temperature transport in armchair carbon nanotubes. The unambiguous manifestation of coherent intertube dynamics proves a single-chirality armchair nanotube film to be a unique macroscopic solid-state ensemble of nano-objects promising for the development of room-temperature coherent electronic devices.

关键词： electrical conductivity Electron-phonon coupling Nanotubes

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Hyperdimensional spin-orbit microlaser

Hyperdimensional spin-orbit microlaser

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Zhang, Zhifeng Zhao, Haoqi Wu, Shuang Wu, Tianwei Qiao, Xingdu Gao, Zihe Agarwal, Ritesh Longhi, Stefano Litchinitser, Natalia M. Ge, Li Feng, Liang Department of Materials Science and Engineering University of Pennsylvania PhiladelphiaPA19104 United States Department of Electrical and Systems Engineering University of Pennsylvania PhiladelphiaPA19104 United States Dipartimento di Fisica Politecmco di Milano Piazza L. da Vinci 32 MilanoI-20133 Italy Institute de Fisica Interdisciplinar y Sistemas Complejos Palma deMallorca Spain Department of Electrical and Computer Engineering Department of Physics Duke University DurhamNC27708 United States Department of Engineering Science and Physics College of Staten Island CUNY Staten IslandNY10314 United States The Graduate Center CUNY New YorkNY10016 United States

ISBN: (纸本)9781957171258

Despite the rapid development of photonic devices and systems, on-chip information technologies are mostly limited to two-level systems due to the lack of sufficient reconfigurability. Here, we demonstrate a high-dimensional, spin-orbit microlaser for chip-scale flexible generation and manipulation of arbitrary four-level states. Two microcavities coupled through a non-Hermitian synthetic gauge field are designed to emit spin-orbit-coupled states of light with six degrees of freedom (DOFs). The vectorial state of the emitted laser beam in free space can be mapped on a Bloch hypersphere defining an SU(4) symmetry, demonstrating dynamical generation and reconfiguration of high-dimensional superposition states with high fidelity. © Optica Publishing Group 2023 © 2023 The Author(s)

关键词： Photonic devices

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Point defects in CdTe and CdTeSe alloy: a first principles investigation with DFT+U

arXiv

引用

arXiv 2024年

作者： Xiang, Xiaofeng Tong, Yijun Gehrke, Aaron Dunham, Scott Molecular Engineering & Sciences Institute University of Washington SeattleWA98195 United States Department of Electrical and Computer Engineering University of Washington SeattleWA98195 United States Department of Materials Science & Engineering University of Washington SeattleWA98195 United States

CdTe and its alloy CdTeSe are widely used in optoelectronic devices, such as radiation detectors and solar cells, due to their superior electrical properties. However, the formation of defects and defect complexes in these materials can significantly affect their performance. As a result, understanding the defect formation and recombination processes in CdTe and CdTeSe alloy is of great importance. In recent years, density functional theory (DFT) calculations have emerged as a powerful tool for investigating the properties of defects in semiconductors. In this paper, we use DFT+U calculations to comprehensively study the properties of intrinsic defects as well as extrinsic defects induced by commonly used dopants, such as Cu and group V elements, in CdTe and CdTeSe alloy. This work provides insights into the effects of these defects on the electrical and optical properties of the material. Copyright © 2024, The Authors. All rights reserved.

关键词： Cadmium telluride

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Automatic LPI Radar Waveform Recognition Using Vision Transformer

Automatic LPI Radar Waveform Recognition Using Vision Transf...

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IEEE International Conference on Radar

作者： Junseob Kim Sunghwan Cho Sunil Hwang Yeongyoon Choi Department of Electrical Engineering Korea Military Academy Republic of Korea Maneuver System Coordination and Contract Team Defense Acquisition Program Administration Republic of Korea Department of Electrical Engineering and Computer Science GIST Republic of Korea

This paper investigates the classification of low probability of intercept (LPI) radar signals by exploiting the intrinsic advantages of the Vision Transformer (ViT). Due to the characteristics of LPI radar signals, such as intrapulse modulation, wide frequency bands, and low transmission power, these signals are challenging to be detected and classified using traditional analytic methods. This has led to the adoption of various deep learning techniques to overcome these limitations. On the one hand, the ViT, originally developed for natural language processing, has demonstrated outstanding performance in computer vision by replacing the structure of the convolutional neural network (CNN) with the transformer, specifically leveraging self-attention. Therefore, this paper explores a method based on the ViT technique for classifying LPI signal images. The simulation results show that the proposed ViT method outperforms the traditional CNN method by 12.8% at −10dB SNR.

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Aging assessment of silicone rubber materials under corona discharge accompanied by humidity and UV radiation

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Nanotechnology Reviews 2024年第1期13卷

作者： Mahmood, Atif Muneeb, Ahmed Saeed, Usman Alam, Shahid Al-Ammar, Essam A. Kang, Jee-Hyun Zoubi, Wail Al Choi, Dongwhi Department of Electrical and Computer Engineering COMSATS University Sahiwal57000 Pakistan Department of Botany Division of Science and Technology University of Education Lahore54000 Pakistan Department of Chemical Engineering Muhammad Nawaz Sharif University of Engineering and Technology MNS UET Multan60000 Pakistan Department of Electrical Engineering College of Engineering King Saud University P.O. Box 800 Riyadh11421 Saudi Arabia School of Materials Science and Engineering Yeungnam University Gyeongsan38541 Korea Republic of Kyung Hee University 1732 Deogyeong-daero Gyeonggi Yongin17104 Korea Republic of

High voltage (HV) outdoor insulators are subjected to both electrical and environmental stresses, which may lead to their failure. Among the causes, corona discharge, humidity and UV radiation are considered to be the most damaging factors. Efforts are therefore underway to investigate new materials for improving the performance of insulating systems. In this research work, silicone-based room temperature vulcanized samples filled with alumina trihydrate (ATH), silicon dioxide and magnesium hydroxide (MH) were prepared and exposed to AC corona discharge for a duration of 110 h. The electric discharge was also accompanied by UV radiation and two different humidity levels. Following aging of the test samples, diagnosis was conducted to assess their integrity. Measurements based on determining the static contact angle demonstrated the loss of hydrophobicity of all the materials, while hydrophobicity recovery phenomena revealed that ATH-doped materials demonstrated a comparatively higher increase in the contact angle than in samples filled with silicone dioxide (silica) and MH. Scanning electron microscopy analysis revealed deep cracks and block-like structures on their surfaces. Similarly, energy-dispersive X-ray analysis indicated the signs of surface oxidation of the aged samples. However, the data of elemental composition exhibited the loss of filler contents as well as that of carbon from the base matrix. The overall assessment showed that resistance to suppress aging is influenced by both the filler type and its concentration in the investigated composites. The ATH-filled composites exhibited outstanding performance when exposed to the rigors of corona discharge and other environmental stresses. This research contributes to materials science and HV engineering by addressing the development of composites for enhanced insulator performance, with future aspects lying in the utilization of nano-composites for advanced functionality and durability. © 2024 the author(s)

关键词： Contact angle

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Ultra Wide Dynamic Range High Power RF Rectifier

Ultra Wide Dynamic Range High Power RF Rectifier

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European Conference on Antennas and Propagation, EuCAP

作者： Xiaochen Yu Jinyao Zhang Minzhang Liu Yi Huang Ta-Jen Yen Jiafeng Zhou Department of Electrical Engineering and Electronics University of Liverpool Liverpool UK Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan International Intercollegiate Ph.D. Program National Tsing Hua University Hsinchu Taiwan

A high-power RF-to-DC rectifier applied to wireless power transfer (WPT) with ultra-wide input power dynamic range is proposed in this paper. A GaN (gallium nitride) HEMT (high electron mobility transistor) is utilized to realize rectification at high power up to 12 W and a Schottky diode is used for lower-power rectification. Excellent switching between the two circuits’ rectification modes is achieved by adding a circulator. The rectifier has a 30 dB dynamic range with an efficiency of over 50% at 2.4 GHz.

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