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Chirped Large Mode Area Photonic Crystal Modal Fibers and its Resonance Modes Based on Finite Element Technique

Journal of Optical Communications 2023年第3期44卷 333-338页

作者： Amiri, I.S. Rashed, Ahmed Nabih Zaki Sarker, Kaushik Paul, Bikash Kumar Ahmed, Kawsar Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam Electronics and Electrical Communications Engineering Department Faculty of Electronic Engineering Menoufia University Menouf32951 Egypt Department of Software Engineering Daffodil International University 102 Mirpur Road Shukrabad Dhanmondi Dhaka1207 Bangladesh Group of Bio-photomatiχ Information and Communication Technology Mawlana Bhashani Science and Technology University Tangail Santosh1902 Bangladesh Department of Information and Communication Technology Mawlana Bhashani Science and Technology University Tangail Santosh1902 Bangladesh

The study has outlined the finite element technique used for the fiber modal analysis of photonic crystal fiber (PCF) structure with a hexagonal/circular air holes arrangement on the cladding of pure fiber-optic silica. The used fibers that are namely highly nonlinear fiber (HNLF), single model silica fiber (SMSF) are combined with PCFs with different dopants concentration. Leakage loss, number of guided resonant modes, fiber birefringence, effective refractive index and cross-section areas and nonlinear coefficient parameters are measured inaccurate estimation. The optimum resonant guided modes are also estimated for different lattice infrastructure in circular PCFs. © 2019 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Modal analysis

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The century-old picture of a nerve spike is wrong: filaments fire, before membrane

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Communicative and Integrative Biology 2022年第1期15卷 115-120页

作者： Ghosh, Subrata Singh, Pushpendra Manna, Jhimli Saxena, Komal Sahoo, Pathik Krishnanda, Soami Daya Ray, Kanad Hill, Jonathan P. Bandyopadhyay, Anirban Chemical Science and Technology Division CSIR-North East Institute of Science and Technology NEIST Jorhat India Academy of Scientific and Innovative Research (ACSIR) Ghaziabad India International Center for Materials and Nanoarchitectronics (WPI-MANA) Research Center for Advanced Measurement and Characterization (RCAMC) Tsukuba Japan Advanced Technology Development Center Indian Institute of Technology Kharagpur India Microwave Physics Laboratory Department of Physics and Computer Science Dayalbagh Educational Institute Dayalbagh India Amity School of Applied Science Amity University Rajasthan Jaipur India

In 1907, Lapicque proposed that an electric field passes through the neuronal membrane and transmits a signal. Subsequently, a “snake curve” or spike was used to depict the means by which a linear flat current undergoes a sudden Gaussian or Laplacian peak. This concept has been the accepted scenario for more than 115 years even appearing in textbooks on the subject. It was not noted that the membrane spike should have a cylindrical shape. A nerve spike having a dot shape on membrane surface cannot propagate through a cylindrical surface since it would dissipate instantaneously. A nerve spike should have the appearance of a ring, encompassing the diameter of a cylindrical axon or dendron. However, this subtle change has remarkable implications. Maintaining a circular form of an electric field is not easy, especially at the surface of an organic object. Here, we suggest that neuroscience could redefine itself if we accept that a nerve spike is not a localized 3D Gaussian or Laplacian wave packet, rather it is a 3D ring encompassing the diameter of a neural branch. © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

关键词： Ion channel Nerve spike neuron neurophysiology

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Systematic search for stabilizing dopants in ZrO2and HfO2using first-principles calculations 29

Systematic search for stabilizing dopants in ZrO2and HfO2usi...

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29th International Symposium on Semiconductor Manufacturing, ISSM 2022

作者： Harashima, Yosuke Koga, Hiroaki Ni, Zeyuan Yonehara, Takehiro Katouda, Michio Notake, Akira Matsui, Hidefumi Moriya, Tsuyoshi Si, Mrinal Kanti Hasunuma, Ryu Uedono, Akira Shigeta, Yasuteru Graduate School of Science and Technology Nara Institute of Science and Technology Nara Ikoma630-0192 Japan Research Organization for Information Science and Technology Department of Computational Science and Technology Tokyo105-0013 Japan Tokyo Electron Technology Solutions Ltd. S-Technology Development Center Yamanashi Nirasaki407-0192 Japan Tokyo Electron Ltd. SDC AI Development Department Hokkaido Sapporo060-0003 Japan Tokyo Electron Ltd. Advanced Data Planning Department Tokyo107-6325 Japan University of Tsukuba Center for Computational Sciences Ibaraki Tsukuba305-8577 Japan University of Tsukuba Faculty of Pure and Applied Science Ibaraki Tsukuba305-8573 Japan

ISBN: (纸本)9781665471336

In this study, we performed systematic search for dopants to stabilize the tetragonal structure of HfO2 and ZrO2 by using first-principles calculations. Whole impurity configurations within the supercell, more than 12,000 systems, are examined and the most stable configurations are assumed to be realized. We reveal the contributions of the dopants to the structural stability of tetragonal phase, and that Si or Ge significantly stabilize the tetragonal phase. © 2022 IEEE.

关键词： Zirconia

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Performance Evaluation of Bidirectional Wavelength Division Multiple Access Broadband Optical Passive Elastic Networks Operation Efficiency

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Journal of Optical Communications 2024年第1期45卷 87-93页

作者： Sivaranjani, S. Sampathkumar, A. Rashed, Ahmed Nabih Zaki Sundararajan, T.V.P. Amiri, Iraj S. Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Vietnam Ho Chi Minh City700000 Viet Nam Faculty of Applied Sciences Ton Duc Thang University Vietnam Ho Chi Minh City700000 Viet Nam Department of EEE Sri Krishna College of Engineering and Technology Coimbatore India School of CSE VIT Bhopal University Bhopal India Electronics and Electrical Communications Engineering Department Faculty of Electronic Engineering Menoufia University Menoufia Menouf32951 Egypt Department of ECE Sri Shakthi Institute of Engineering and Technology Coimbatore641014 India

The study has outlined the performance evaluation of bidirectional wavelength division multiple access broadband optical passive elastic networks operation efficiency. Signal power level, Q coefficient parameter, and minimum data error rates are measured numerically in both downstream and upstream directions based on broadband passive optical networks (BPONs). The transmission data rate available in the downstream direction is 10 Gb/s, while its value in the upstream direction is 2 Gb/s. The suitable operating wavelength is selected in the near-infrared region around 1550 nm for minimum losses. The bits sequence length of the optical transmitter is taken in to account for testing the optical network performance efficiency. The proposed model has presented better performance than the previous model by 25.76% in downstream direction and by 12.28% in upstream direction. As well as the bidirectional wavelength division multiple access broadband passive optical elastic networks performance efficiency is measured. © 2024 Walter de Gruyter GmbH. All rights reserved.

关键词： Passive optical networks

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Tuning 2D magnetism in Fe3+XGeTe2 films by element doping

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National science Review 2022年第6期9卷 163-170页

作者： Shanshan Liu Zihan Li Ke Yang Enze Zhang Awadhesh Narayan Xiaoqian Zhang Jiayi Zhu Wenqing Liu Zhiming Liao Masaki Kudo Takaaki Toriyama Yunkun Yang Qiang Li Linfeng Ai Ce Huang Jiabao Sun Xiaojiao Guo Wenzhong Bao Qingsong Deng Yanhui Chen Lifeng Yin Jian Shen Xiaodong Han Syo Matsumura Jin Zou Yongbing Xu Xiaodong Xu Hua Wu Faxian Xiu State Key Laboratory of Surface Physics and Department of Physics Fudan University Institute for Nanoelectronic Devices and Quantum Computing Fudan University College of Science University of Shanghai for Science and Technology Laboratory for Computational Physical Sciences(MOE) Fudan University Solid State and Structural Chemistry Unit Indian Institute of Science School of Electronic Science and Engineering Nanjing University Department of Physics University of Washington Department of Electronic Engineering Royal Holloway University of London Materials Engineering The University of Queensland Beijing Key Laboratory of Microstructure and Property of Advanced Materials Institute of Microstructure and Property of Advanced Materials Beijing University of Technology The Ultramicroscopy Research Center Kyushu University State Key Laboratory of ASIC and System School of Microelectronics Fudan University Collaborative Innovation Center of Advanced Microstructures Department of Applied Quantum Physics and Nuclear Engineering Kyushu University Centre for Microscopy and Microanalysis The University of Queensland Shanghai Research Center for Quantum Sciences

Two-dimensional（2D） ferromagnetic materials have been discovered with tunable magnetism and orbital-driven nodal-line features. Controlling the 2D magnetism in exfoliated nanoflakes via electric/magnetic fields enables a boosted Curie temperature（TC） or phase transitions. One of the challenges, however, is the realization of high TC2D magnets that are tunable, robust and suitable for large scale fabrication. Here, we report molecular-beam epitaxy growth of wafer-scale Fe3+XGeTe2films with TCabove room temperature. By controlling the Fe composition in Fe3+XGeTe2, a continuously modulated TCin a broad range of 185–320 K has been achieved. This widely tunable TCis attributed to the doped interlayer Fe that provides a 40% enhancement around the optimal composition X = 2. We further fabricated magnetic tunneling junction device arrays that exhibit clear tunneling signals. Our results show an effective and reliable approach, i.e. element doping, to producing robust and tunable ferromagnetism beyond room temperature in a large-scale 2D Fe3+XGeTe2fashion.

关键词： 2D ferromagnetic material Fe3+XGeTe2 film element doping above room temperature TC tunability

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Vacancy-Type Defects in HfO2 Layers and Their Role in Amorphous-to-Crystalline Transition Studied by Monoenergetic Positron Beams

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IEEE Transactions on Semiconductor Manufacturing 2025年

作者： Uedono, Akira Kawakami, Kazuya Kuribara, Tatsunori Hasunuma, Ryu Harashima, Yosuke Shigeta, Yasuteru Ni, Zeyuan Yan, Ruolin Nakamura, Hideo Notake, Akira Moriya, Tsuyoshi Michishio, Koji Ishibashi, Shoji University of Tsukuba Faculty of Pure and Applied Science Tsukuba Ibaraki305-8573 Japan Nara Institute of Science and Technology Graduate School of Science and Technology Ikoma Nara630-0192 Japan Tokyo Electron Technology Solutions Ltd S-Technology Development Center Nirasaki Yamanashi650 Japan Tokyo Electron Technology Solutions Ltd Development Department1 Nirasaki Yamanashi407-0192 Japan Tokyo Electron Ltd Digital Design Center Sapporo Hokkaido060-0003 Japan Tokyo Electron Technology Solutions Ltd Software and Data Engineering Division Nirasaki Yamanashi407-0192 Japan National Institute of Advanced Industrial Science and Technology Research Institute for Measurement and Analytical Instrumentation Tsukuba Ibaraki305-8568 Japan National Institute of Advanced Industrial Science and Technology Research Center for Computational Design of Advanced Functional Materials Tsukuba Ibaraki305-8568 Japan

The annealing properties of vacancies in HfO2 layers deposited on Si substrates and their role in amorphous-to-crystalline transition were studied with monoenergetic positron beams. HfO2 layers with a thickness of 4.30 nm were fabricated by the atomic layer deposition technique. The major vacancytype defects in these layers were identified as a Hf vacancy (VHf) coupled with multiple oxygen vacancies (VOs) and larger vacancy clusters. After annealing at 500°C, the concentration of vacancy clusters started to increase, which was attributed to the agglomeration of intrinsic open spaces in the amorphous phase upon the phase transition from amorphous to monoclinic crystalline phases. The amorphous-crystalline transition started near the interface between the HfO2 layer and bottom electrodes (TiN). After the crystallization, the concentration of vacancy clusters decreased as the annealing temperature increased. © 2025 IEEE.

关键词： Hafnium oxides

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A multiphase-field model for simulating the hydrogen-induced multi-spot corrosion on the surface of polycrystalline metals: Application to uranium metal

arXiv

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arXiv 2023年

作者： Sheng, Jie Liu, Yu Shi, Xiao-Ming Wang, Yue-Chao Chen, Zi-Hang Xu, Ke Wu, Shuai Huang, Hou-Bing Sun, Bo Liu, Hai-Feng Song, Hai-Feng Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing100088 China School of Materials Science and Engineering Beijing Institute of Technology Beijing100081 China Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing100081 China

Hydrogen-induced multi-spot corrosion on the surface of polycrystalline raremetals is a complex process, which involves the interactions between phases(metal, hydride and oxide), grain orientations, grain boundaries, and corrosionspots. To accurately simulate this process and comprehend the underlyingphysics, a theoretical method is required that includes the followingmechanisms: i) hydrogen diffusion, ii) phase transformation, iii) elasticinteractions between phases, especially, the interactions between the oxidefilm and the hydride, iv) elastic interactions between grains, and v)interactions between hydrogen solutes and grain boundaries. In this study, wereport a multiphase-field model that incorporates all these requirements, andconduct a comprehensive study of hydrogen-induced spot corrosion on the uraniummetal surface, including the investigation of the oxide film, multi-spotcorrosion, grain orientation, and grain boundary in the monocrystal, bicrystal,and polycrystal systems. The results indicate that the oxide film can inhibitthe growth of hydrides and plays a crucial role in determining the correctmorphology of the hydride at the triple junction of phases. The elasticinteraction between multiple corrosion spots causes the merging of corrosionspots and promotes the growth of hydrides. The introduction of grainorientations and grain boundaries results in a variety of intriguingintracrystalline and intergranular hydride morphologies. The model presentedhere is generally applicable to the hydrogen-induced multi-spot corrosion onany rare metal surface. Copyright © 2023, The Authors. All rights reserved.

关键词： Hydrides

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Towards an Automated System for Reverse Geocoding of Aerial Photographs 30

Towards an Automated System for Reverse Geocoding of Aerial ...

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30th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, WSCG 2022

作者： Praschl, Christoph Stradner, Michael Ono, Yuta Zwettler, Gerald Research Group Advanced Information Systems and Technology Research and Development Department University of Applied Sciences Upper Austria Austria Graduate School of Software and Information Science Iwate Prefectural University Japan Department of Software Engineering School of Informatics Communications and Media University of Applied Sciences Upper Austria Austria

ISBN: (纸本)9788086943336

Aerial photographs of buildings are often used as memorabilia sold by trading companies. Such photographs come with an issue regarding the address of the shown buildings, since the recording location of the camera may be known, but shows a spatial distance to the actual subject of the image. In addition to that, also this recording location is often not known in detail but only roughly in the form of the flight route/area. To address this problem, a methodology for reverse geocoding is proposed, allowing to identify the position of buildings that are photographed from aerial vehicles. This is done using a process for extending recording locations and a second process based on the registration of invariant features within aerial shots compared to maps. © 2022 University of West Bohemia. All rights reserved.

关键词： Aerial photography

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PEALD deposited aluminum hafnium mixed oxide dielectrics for amorphous-IGZO TFTs

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Ceramics International 2024年第3期50卷 5350-5362页

作者： Chen, Han-Bin Wu, Wan-Yu Wang, Yao-Tian Yan, Jia-Hao Zhao, Ming-Jie Zhang, Xiao-Ying Gao, Peng Wuu, Dong-Sing Lai, Feng-Min Lien, Shui-Yang Zhu, Wen-Zhang Xiamen Key Laboratory of Development and Application for Advanced Semiconductor Coating Technology Fujian Xiamen361024 China The School of Opto-electronic and Communication Engineering Xiamen University of Technology Fujian Xiamen361024 China Department of Materials Science and Engineering National United University Miaoli 360302 Taiwan Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fujian Fuzhou350002 China Department of Applied Materials and Optoelectronic Engineering National Chi Nan University Nantou 54561 Taiwan Department of Biomedical Engineering Da-Yeh University Changhua51591 Taiwan

(Al–Hf) mixed oxide thin films (HfAlO) are attracted by many researchers because of their outstanding optical and electrical properties compared to hafnium oxide (HfO2). This study prepared HfAlO films at 300 °C using plasma-enhanced atomic layer deposition (PEALD). Changing the cycle ratio of HfO2 and aluminum oxide (Al2O3), the mixing effect on the properties of HfAlO film was studied. The characterization of the HfAlO films was investigated using spectroscopic ellipsometry (SE), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray reflectivity (XRR), scanning electron microscopy (SEM), and UV–vis spectroscopy. The results show that the aluminum content and optical bandgap of the HfAlO films increased with the increase of the Al2O3 cycle ratio. The dielectric constant of the HfAlO film with a 20 % Al2O3 cycle ratio (cycles of Al2O3/(cycles of Al2O3 + cycles of HfO2)) reaches ∼ 26, and the breakdown electric field is about 6.5 MV/cm. Pure HfO2 and 20 % Al2O3 cycle ratio deposited HfAlO was used as the gate dielectric layer, and the influence on the performance of amorphous indium gallium zinc oxide (a-IGZO) thin film transistor (TFT) was studied. A-IGZO TFT with a 20 % Al2O3 cycle ratio mixed HfAlO film as the gate dielectric exhibits the best performance, showing a high Ion/Ioff ratio of 1.3 × 109, a saturation mobility of ∼5.8 cm2/Vs, a subthreshold slope of 88 mV per decade and a low threshold voltage of −0.1V. © 2023 Elsevier Ltd and Techna Group S.r.l.

关键词： Thin film transistors

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Fifth international conference on materials and environmental science: Role of new materials in sustainable development

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Materials Today: Proceedings 2023年 72卷 3940-3942页

作者： Touzani, R. Hammouti, B. Eddaoudi, M. Laboratory of Applied Chemistry and Environment LCAE Faculty of Science Mohammed I University PO Box. 717 Oujda60 000 Morocco Centre de Recherche Ecole des Hautes Etudes d'Ingenierie EHEIO Oujda Morocco Functional Materials Design Discovery and Development Research Group Advanced Membranes and Porous Materials Center Division of Physical Sciences and Engineering King Abdullah University of Science and Technology KAUST Thuwal 23955-6900 Saudi Arabia

The Fifth International Conference on Materials and Environmental science (ICMES20221), is an interdisciplinary platform to promote a multi-sectoral and collaborative approach in the field of development of new and innovative approaches in materials, their applications in energy and renewable energy, environmental science, sustainable development, health, biotechnology and electrical engineering. The scientific committee of ICMES2022 agreed that the health session was the priority since the Covid19 pandemic still constitutes a Public Health Emergency of International Concern. There are many multifunctional materials available by the advent of nanotechnology, ranging from carbon nanotubes, graphene, inorganic nanoparticles, conducting polymers, 2D materials, CO2 material capture, etc… Materials science Conference is an event that brings together leading researchers spanning the field of materials science and engineering to present and discuss cutting edge research with other experts in the field: exchanging ideas to advance current understanding towards the future of materials science. © 2022

关键词： Sustainable development

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