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Device Research Conference

作者： Dennis Braun Sebastian Lukas Lukas Vö lkel Oliver Hartwig Maximilian Prechtl Melkamu Belete Satender Kataria Thorsten Wahlbrink Alwin Daus Georg S. Duesberg Max C. Lemme Chair of Electronic Devices RWTH Aachen University Aachen Germany Faculty of Electrical Engineering and Information Technology (EIT 2) and Center for Integrated Sensor Systems Institute of Physics University of the Bundeswehr Munich Neubiberg Germany AMO GmbH Advanced Microelectronic Center Aachen Aachen Germany

ISBN: (数字)9781665498838

ISBN: (纸本)9781665498845

Two-dimensional (2D) materials such as transition metal dichalcogenides (TMDCs) have gained attention for neuromorphic computing applications due to their resistive switching (RS) behavior [1], [2]. Among TMDCs, platinum diselenide (PtSe 2 ) stands out because it can be grown at complementary metal-oxide-semiconductor (CMOS) back-end-of-line (BEOL) compatible temperatures [3], [4] and it has shown excellent long-term stability [5]. However, its potential for RS remains largely unexplored with only preliminary proof-of-concept characteristics presented in a multilayer PtSe 2 device with Au electrodes [6]. Here, we present the first detailed study on forming free RS in PtSe 2 -based crosspoint (CP) memristors using CMOS-compatible electrodes. We find remarkably low switching fields (0.08 V /nm) likely related to our choice of electrode materials and excellent retention for at least several days.

关键词： Electrodes Gold Temperature Neuromorphic engineering Two dimensional displays Platinum Memristors

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Ultrafast polarization modulation with high-purity chiral quasi-BIC metasurfaces

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Chinese Optics Letters 2025年第5期 142-148页

作者：赖方兴范宇斌沙新博邓画春蒋雄肖淑敏黄灿宋清海 Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Harbin Institute of Technology (Shenzhen) Department of Electrical Engineering City University of Hong Kong Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor Devices

Precise control of the polarization state of light on ultrafast time scales plays a key role in revealing the inherent chiral or anisotropic optical responses in various material systems, and it is crucial for applications that require complex polarization encoding. Here, we explore ultrafast polarization control enabled by silicon-based chiral bound state in the continuum（BIC）metasurfaces. By utilizing the intrinsic chiral mode, we achieve high-purity chiral reflection light（S3～-0.92） and rapid modulation（～0.4 ps） of polarization states through all-optical methods. Unlike traditional polarization modulation techniques, our approach leverages the unique advantages of slanted etching dielectric chiral BIC metasurfaces, which facilitate high-Q resonance and exhibit narrow linewidths. These advantages allow swift alterations in polarization states with minimal modulation energy consumption, which should help for greater control of light in integrated photonic applications.

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Competing effects of temperature and mechanical stress on polar vortex transition in oxide superlattices

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Physical Review B 2024年第19期110卷 195417-195417页

作者： Pan Chen Xu Hou Jiandi Zhang Congbing Tan Peng Gao Yan Liang Xuezeng Tian Lei Liao Xu-Sheng Yang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China International Center for Quantum Materials and Electron Microscopy Laboratory School of Physics Peking University Beijing 100871 China Department of Industrial and Systems Engineering Research Institute for Advanced Manufacturing The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China Department of Engineering Mechanics Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University Zheda Road 38 Hangzhou Zhejiang 310027 China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518060 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and Electronics Hunan University of Science and Technology 411201 Hunan Xiangtan China

The interplay of different forms of energies in oxide superlattices, such as elastic, electrostatic, and gradient energies, can result in a stable long-range ordered polar vortex structure at room temperature. However, the role between these energies in determining the vortex structure still remains largely elusive due to the intricate interplay. By using a comprehensive in situ TEM apparatus and a prototype system, PbTiO3/SrTiO3 superlattice, we demonstrate that the vortex structure undergoes a first-order transition at the temperature around 653 K, while the application of in-plane mechanical stress at such a high temperature results in the reemergence of vortex structure. Cryogenic cooling to 94 K raises the stability of vortices, which would be destabilized by loading of out-of-plane mechanical stress. The results can be reproduced and well interpreted by phase-field simulations. These findings not only reveal the competing role of the temperature and mechanical stress at atomic scale but also demonstrate a feasible way to operate the vortex-based nanodevices working in harsh environments.

关键词： Electric polarization Ferroelectricity Electron diffraction Electron microscopy Liquid nitrogen cooling Phase-field modeling Scanning probe microscopy

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Simulation of Radio Tomographic Imaging for Measurement Rice Moisture Content 10

Simulation of Radio Tomographic Imaging for Measurement Rice...

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10th IEEE International Conference on Control System, Computing and engineering, ICCSCE 2020

作者： Abdullah, Mohammed Saeed Moqbel Kamarudin, Latifah Munirah Rahiman, Mohd Hafiz Fazalul Mohamed, Latifah Zakaria, Ammar Universiti Malaysia Perlis School of Mechatronic Engineering Perlis Malaysia Universiti Malaysia Perlis School of Computer and Communication Engineering Perlis Malaysia Universiti Malaysia Perlis Centre of Excellence for Advanced Sensor Technology School of Mechatronic Engineering Perlis Malaysia Universiti Malaysia Perlis School of Electrical Systems Engineering Perlis Malaysia

ISBN: (纸本)9781728172439

Radio Tomographic Imaging (RTI) is an emerging technology for imaging the attenuation caused by physical objects in wireless networks that perform wireless receive signal strength (RSS) measurements obtain a reconstruction of objects inside an area of interest to know the different moisture content of rice in the silo. The simulation results analysis has been performed. The image of the phantoms was reconstructed by the selected image reconstruction algorithms, which are Linear Back Projection (LBP), Filtered Back Projection (FBP), and Gaussian. Evaluation of this work was assessed by using three image quality assessment techniques Mean Structural Similarity Index (MSSIM). MSSIM was used to analyze the reconstructed images. Among the three proposed images reconstruction algorithms linear back projection, filtered back projection, and Gaussian algorithm. Gaussian seems to be a more reliable option for reconstructing the image of moisture content of rice in a silo by using 20 RF nodes in the RTI system. This paper discusses in detail the use of shadowing losses on links between RF sensors in a wireless community to image the attenuation of moisture content inside the wi-fi network vicinity. © 2020 IEEE.

关键词： Moisture

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Correction: The effects on performance and emission characteristics of DI engine fuelled with CeO2 nanoparticles addition in diesel/tyre pyrolysis oil blends

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Environment, Development and Sustainability 2022年 1-2页

作者： Rajak, Upendra Nashine, Prerana Chaurasiya, Prem Kumar Verma, Tikendra Nath Dasore, Abhishek Pathak, Kamal Kishore Dwivedi, Gaurav Shukla, Anoop Kumar Saini, Gaurav Department of Mechanical Engineering Rajeev Gandhi Memorial College of Engineering and Technology Nandyal India Department of Mechanical Engineering Oriental Institute of Science & Technology Bhopal India Department of Mechanical Engineering Bansal Institute of Science and Technology Bhopal India Department of Mechanical Engineering Maulana Azad National Institute of Technology Bhopal India Department of Mechanical Engineering Government Polytechnic Sheikhpura India Energy Centre Maulana Azad National Institute of Technology Bhopal India Department of Mechanical Engineering Amity University Uttar Pradesh Noida India School of Advanced Materials Green Energy and Sensor Systems Indian Institute of Engineering Science and Technology (IIEST) Howrah India

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Mechanoluminescent hybrids from a natural resource for energy-related applications

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InfoMat 2021年第11期3卷 1272-1284页

作者： Chunfeng Wang Ronghua Ma Dengfeng Peng Xianhu Liu Jing Li Boru Jin Aixian Shan Yu Fu Lin Dong Wenchao Gao Zhong Lin Wang Caofeng Pan Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenChina CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingChina Key Laboratory of Materials Processing and Mold(Ministry of Education) Henan Key Laboratory of Diamond Optoelectronic Materials and DevicesKey Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhouChina Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface ScienceSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijingChina Department of Civil Engineering Monash UniversityClaytonAustralia

Mechanoluminescent(ML)materials that directly convert mechanical energy into photon emission have emerged as promising candidates for various *** the recent advances in the development of both novel and conventional ML materials,the limited access to ML materials that simultaneously have the attributes of high brightness,low cost,self-recovery,and stability,and the lack of appropriate designs for constructing ML devices represent significant challenges that remain to be addressed to boost the practical application of ML ***,ML hybrids derived from a natural source,waste eggshell,with the aforementioned attributes are *** introduction of the eggshell not only enables the preparation of the hybrid in a simple and cost-effective manner but also contributes to the homochromatism(red,green,or blue emission),high brightness,and robustness of the resultant ML *** significant properties of the ML hybrids,together with the proposed structural design,such as porosity or core–shell structure,could expedite a series of mechanic-optical applications,including the self-luminous shoes for the conversion of human motions into light and light generators that efficiently harvest water wave *** fascinating properties,versatile designs,and the efficient protocol of“turning waste into treasure”of the ML hybrids represent significant advances in ML materials,promising a leap to the practical applications of this flouring material family.

关键词： blue energy harvesting eggshell waste mechanoluminescent hybrids smart sensing

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Optical Modelling Of Gaas/Gasb Core-Shell Cone Topped Octagonal Faced Nanopillar Array With Periodic Trapezoidal Textured Cut For High Photon Trapping Efficiency

Research Square

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Research Square 2021年

作者： Baruah, Smriti Borah, Janmoni Bora, Joyatri Maity, Santanu Department of Electronics and Communication Engineering Madanapalle Institute of Technology and Science Madanapalle India Department of Electronics and Communication Engineering North Eastern Regional Institute of Science and Technology Nirjuli India School of Advanced Materials Green Energy and Sensor Systems Indian Institute of Engineering Science and Technology Shibpur Howrah 711103 India

Proficiency in light reflectance mitigation is the most crucial factor for high photodetector *** this respect light trapping mechanism based on nanostructures or microstructures such as nanopillars,nanocones,nanopyramids have emerged as the most promising candidate for reducing overall light reflectance. This could be attributed to its effective large irradiation area, multiple scattering of incident light as well as increased path length of incident rays in these *** paper proposes an optical modelling of a GaAs/GaSb material based vertically oriented core-shell cone topped octagonal shaped nanopillar structure with periodical trapezoidal nanotexturization over it to be deployed over a circular planar detector’s surface of radius *** geometrical analytical investigation of the proposed model exhibits a 0.999 overall absorbance and 0.995A/W photoresponsivity along with 87% EQE at 1um operating wavelength. © 2021, CC BY.

关键词： Reflection

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A parallel Architecture of a Genetic Algorithm for EIT Image Reconstruction

A parallel Architecture of a Genetic Algorithm for EIT Image...

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IEEE SSD International Multi-Conference on systems, Signals and Devices

作者： Mariem Hafsa Bilel Ben Atitallah Taha Ben Salah Najoua Essoukri Ben Amara Olfa Kanoun Professorship of Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany National Engineering School of Sousse University of Sousse Sousse Tunisia Université de Sousse Ecole Nationale d'Ingénieurs de Sousse LATIS-Laboratory of Advanced Technology and Intelligent Systems Sousse Tunisie

ISBN: (纸本)9781665414937;9781665430579

Nowadays, electrical impedance tomography (EIT) has become an interesting bio-medical imaging technique, it is non-invasive and shows great potential in medical investigation. The EIT presents high performances in conductivity mapping of the inner structure of a specific target. A set of electrodes are placed around the measured target where an excitation current is injected in a pre-defined frequency. This excitation will cause a variation of the potential distribution and consequently in the conductivity distribution of the measured medium. Therefore, boundary voltages are recorded, which will be used to provide the tomography image of the addressed cross-section. In this paper, the focus will be on the image reconstruction algorithm in order to reach high-quality images. A water tank set-up is used for the experiments where a conductive object is placed inside. Then, a genetic algorithm has been implemented in a parallel form to reduce the execution time by using a master/slave architecture. Moreover, to reach a high and accurate conductivity image, a reference technique has been integrated called the non-blind search. Further, a comparison study of genetic operators' configuration is carried out in terms of fitness values and object position identification. Nine combinations are tested, where the uniform crossover/random mutation shows the highest performance in object position identification with a fitness value equal to 0.0505. A comparison between the implemented solution and commonly used algorithms is established as well, where the genetic algorithm was able to outperform them in terms of fitness values.

关键词： Electric potential Current measurement Conductivity Genetics Storage tanks Frequency measurement Object recognition

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Forward Modelling of the Human Thorax for Electrical Impedance Tomography Measurements

Forward Modelling of the Human Thorax for Electrical Impedan...

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Impedance Spectroscopy (IWIS), International Workshop on

作者： Hamdi Haddad Oumaima Bader Mariem Hafsa Najoua Essoukri Ben Amara Olfa Kanoun University of Sousse National Engineering School of Sousse Sousse Tunisia LATIS- Laboratory of Advanced Technology and Intelligent Systems Université de Sousse Ecole Nationale d'Ingénieurs de Sousse Sousse Tunisie Professorship of Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany

Electrical Impedance Tomography (EIT) is a medical imaging technique that reflects the inner conductivity distribution of biological tissue based on boundary voltages measured at the electrodes around the thorax while injecting an alternating current with a low amplitude. In this work, a 16-electrode thorax mesh is implemented for the pyEIT library. This mesh builds the basis for the reconstruction of the conductivity distributions from real human thorax voltage measurements. Post-processing techniques, such as the K-means method and the region based segmentation, have also been implemented. The resulting re-constructed images reflect the conductivity changes during the breathing cycle and by post-processing artifacts are eliminated leading to a clear image of the lungs and the heart.

关键词： Heart Electrical impedance tomography Image segmentation Voltage measurement Impedance measurement Lung Conductivity

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Frequency fluctuations in nanomechanical silicon nitride string resonators

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Physical Review B 2020年第21期102卷 214106-214106页

作者： Pedram Sadeghi Alper Demir Luis Guillermo Villanueva Hendrik Kähler Silvan Schmid Institute of Sensor and Actuator Systems TU Wien 1040 Vienna Austria Department of Electrical Engineering Koç University Istanbul 34450 Turkey Advanced NEMS Laboratory École Polytechnique Fédérale de Lausanne (EPFL) CH-1015 Lausanne Switzerland

High quality factor (Q) nanomechanical resonators have received a lot of attention for sensor applications with unprecedented sensitivity. Despite the large interest, few investigations into the frequency stability of high-Q resonators have been reported. Such resonators are characterized by a linewidth significantly smaller than typically employed measurement bandwidths, which is the opposite regime to what is normally considered for sensors. Here, the frequency stability of high-Q silicon nitride string resonators is investigated both in open-loop and closed-loop configurations. The stability is here characterized using the Allan deviation. For open-loop tracking, it is found that the Allan deviation gets separated into two regimes, one limited by the thermomechanical noise of the resonator and the other by the detection noise of the optical transduction system. The point of transition between the two regimes is the resonator response time, which can be shown to have a linear dependence on Q. Laser power fluctuations from the optical readout are found to present a fundamental limit to the frequency stability. Finally, for closed-loop measurements, the response time is shown to no longer be intrinsically limited but instead given by the bandwidth of the closed-loop tracking system. Computed Allan deviations based on theory are given as well and found to agree well with the measurements. These results are of importance for the understanding of fundamental limitations of high-Q resonators and their application as high performance sensors.

关键词： Mechanical & acoustical properties Thin films Optical interferometry

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