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2023 IEEE International Magnetic conference - Short Papers, INTERMAG Short Papers 2023

作者： Brems, Maarten A. Raab, Klaus Zázvorka, Jakub Beneke, Grischa Winkle, Thomas Rothörl, Jan Kammerbauer, Fabian Virnau, Peter Mentink, Johan H. Kläui, Mathias Johannes Gutenberg University Mainz Institute for Physics Staudingerweg 7 Mainz55128 Germany Charles University Institute of Physics Faculty of Mathematics and Physics Prague12116 Czech Republic Radboud University Institute for Molecules and Materials Heyendaalseweg 135 Nijmegen6525 AJ Netherlands

ISBN: (纸本)9798350338362

Skyrmions are magnetic whirls which exhibit quasiparticle-behavior, respond strongly nonlinear to external stimuli and have recently been shown to exhibit thermally activated dynamics. These properties open up possible future applications in computing architectures beyond von-Neumann computing. We propose and demonstrate experimentally a conceptually new approach to skyrmion reservoir computing that exploits the thermally activated diffusive motion of skyrmions. By confining the thermal and energetically low, electrically gated skyrmion motion, together with employing spatially resolved input and readout, we find that already a single skyrmion in a confined, triangular geometry suffices to realize non-linearly separable functions, which we demonstrate for the XOR gate along with all other Boolean logic gate operations. Beyond reservoir computing, we design and experimentally realize token-based and stochastic computing devices which also greatly benefit from thermal skyrmion dynamics. © 2023 IEEE.

关键词： Stochastic systems

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Optoelectronic study of Rb2NaInI6 for solar cell efficiency

Optoelectronic study of Rb2NaInI6 for solar cell efficiency

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Power, Control and computing Technologies (ICPC2T), conference on

作者： Nidhi Choudhary Amit Soni Jagrati Sahariya Kishor Kumar Department of Electrical Engineering Manipal University Jaipur Jaipur India Department of Physics NIT Uttarakhand Uttarakhand India Department of Physics Manipal University Jaipur Jaipur India

ISBN: (数字)9798331530402

ISBN: (纸本)9798331530419

In this work, we utilize the TB-mBJ potential within the WIEN2k framework to investigate the properties of the material for its clean energy application of solar cells. The calculations reveal an indirect band gap of 1.719 eV. Additionally, the dielectric constant at zero frequency, $\varepsilon_devices(0)$, is found to be 3.176. Thermoelectric properties were also calculated which demonstrated p-type optimal values. The material demonstrates strong absorption and reflectivity, indicating its potential for optoelectronic applications. The result analysis in this paper provides a broad understanding of the material’s behavior, highlighting its suitability for devices requiring efficient optical performance.

关键词： Integrated optics Reflectivity Photovoltaic systems photonic band gap Photovoltaic cells Power control Perovskites Optical materials Optical reflection Optical devices

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Toward Accurate Thermal Modeling of Phase Change Material-Based photonic devices

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SMALL 2023年第50期19卷 e2304145页

作者： Aryana, Kiumars Kim, Hyun Jung Popescu, Cosmin-Constantin Vitale, Steven Bae, Hyung Bin Lee, Taewoo Gu, Tian Hu, Juejun NASA Langley Res Ctr Hampton VA 23681 USA MIT Dept Mat & Sci Engn Cambridge MA 02139 USA MIT Lincoln Lab Lexington MA 02421 USA Korea Adv Inst Sci & Technol KAIST Anal Ctr Daejeon 34141 South Korea MIT Mat Res Lab Cambridge MA 02139 USA

Reconfigurable or programmable photonic devices are rapidly growing and have become an integral part of many optical systems. The ability to selectively modulate electromagnetic waves through electrical stimuli is crucial in the advancement of a variety of applications from data communication and computing devices to environmental science and space explorations. Chalcogenide-based phase-change materials (PCMs) are one of the most promising material candidates for reconfigurable photonics due to their large optical contrast between their different solid-state structural phases. Although significant efforts have been devoted to accurate simulation of PCM-based devices, in this paper, three important aspects which have often evaded prior models yet having significant impacts on the thermal and phase transition behavior of these devices are highlighted: the enthalpy of fusion, the heat capacity change upon glass transition, as well as the thermal conductivity of liquid-phase PCMs. The important topic of switching energy scaling in PCM devices, which also helps explain why the three above-mentioned effects have long been overlooked in electronic PCM memories but only become important in photonics, is further investigated. These findings offer insight to facilitate accurate modeling of PCM-based photonic devices and can inform the development of more efficient reconfigurable optics. The study identifies key parameters affecting temperature and phase distributions in chalcogenide-based phase-change materials (PCMs) during amorphization cycle: the enthalpy of fusion, the heat capacity, and thermal conductivity of the liquid phase. These findings offer insight to facilitate accurate modeling of PCM-based photonic devices and can inform the development of more efficient reconfigurable optics for large-scale ***

关键词： amorphization phase-change materials temperature thermal conductivity

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Artificial Synapses Enabled Neuromorphic computing: from Blueprints to Reality

Artificial Synapses Enabled Neuromorphic Computing: From Blu...

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IEEE International conference on Integrated Circuit Design and Technology (ICICDT)

作者： Chun Zhao Xi’an Jiaotong-Liverpool University China

Emerging brain-inspired neuromorphic computing systems have become a potential candidate for overcoming the von Neuman bottleneck that limits the performance of most modern computers. Artificial synapses, used to mimic neural transmission and physical information sensing, could build highly robust and efficient computing systems similar to our brains. The employment of nanomaterials in the devices, and the device structures, are receiving a surge of interest, given the various benefits in better carrier dynamics, higher conductance, photonic interaction and photocarrier trapping, and the architectural feasibility with two and three-terminal devices. Moreover, the combination of artificial synapses and various nanomaterial-based active channels also enables visual recognition, multi-modality sensing-processing systems, hardware neural networks, etc., demonstrating appealing possibilities for practical applications. Here, we summarize the recent advances in synaptic devices based on low-dimensional nanomaterials, the novel devices with hybrid materials or structures, as well as implementation schemes of hardware neural networks. By the end of this review, we discuss the engineering issues including control methods, design complexity and fabrication process to be addressed, and envision the future developments of artificial synapse-based neuromorphic systems.

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Proposed Design for Beyond 5G Antenna for Upgraded applications with review 14

Proposed Design for Beyond 5G Antenna for Upgraded Applicati...

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14th International conference on computing Communication and Networking Technologies, ICCCNT 2023

作者： Dwivedi, Smrity Deptt. of Electronics Engg India

ISBN: (纸本)9798350335095

In this paper, design and simulation of THz antennas for beyond 5G has been proposed and investigated. This new era of beyond 5G is useful to connect most of the devices and create a proper balance between systems and users as per demand of technology. For that purpose, a large bandwidth is supposed to be required with better gain. Hence, a new frequency region that is at THz band is utilized. Graphene has been taken as base material having capability of operating at high frequency and also to support graphene, polymide and silicon dioxide have been taken as substrate materials along with layering of air and ground as well. There are five different designs with same structure parameters with different dielectric constant values have been simulated using CST microwave studio for improvement of gain and bandwidth. Few literatures survey has been discussed with evolution of terahertz. Also merit and demerit have been discussed for proposed structures. Bandwidth is increased from 0.3 THz to 0.6 THz and the gain is increased 3.02 dB to10.09 dB for the frequency range from 0.1 THz to 1 THz. As many designed have already been discussed in section I and II, the new thing which is being introduced in this paper, a simple design, easy fabrication, low loss as it has no slots, available materials with simple feeding techniques. © 2023 IEEE.

关键词： Silica

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Design and Simulation of Microstrip Patch Antennas with Textile Dielectrics for Body Sensor Networks (BSNs) and Wearable IoT applications

Design and Simulation of Microstrip Patch Antennas with Text...

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International conference on Advances in Data Science and computing Technologies, ASDC 2022

作者： Mahamuni, Chaitanya Vijaykumar Assistant Professor Department of Computer Engineering Fr. Conceicao Rodrigues Institute of Technology University of Mumbai Navi Mumbai Maharashtra Vashi India

ISBN: (纸本)9789819936557

Wireless Body Area Networks (WBANs) connect sensors, i.e., independent nodes or computing devices located in the clothes, on the human body, or under a person’s skin, expanding over the whole body and connected through wireless networks. WBANs find a wide range of applications in the medical sector, like implanting Body Sensor Networks (BSNs) for cancer screening, cardiovascular (CVD) monitoring, remote health monitoring systems, and telemedicine. They are also used for non-medical applications like sports and fitness monitoring, physical state monitoring, biometrics, etc. A textile antenna uses wearable, durable, and flexible textiles as either dielectric substrates or conductive materials. Microstrip patch antennas are widely used in WBAN and IoT applications due to their numerous advantages, like high gain, directivity, and ease of construction. In addition, these antennas have other safety considerations, e.g., they well isolate the radiating element from the body to meet the rated Specific Absorption Rate (SAR). In this paper, microstrip patch antennas with different types of textile dielectrics and conducting materials have been designed and simulated in MATLAB r2020a. According to the simulation results, textile antennas are suited for use with GSM, GPS, WLAN, and other technologies operating in the Industry Scientific Medical (ISM) band of frequencies. Furthermore, a comparative analysis of the results shows that the microstrip antenna with the flectron patch and the polyurethane dielectric gives the highest gain of 26.96 and an efficiency of 99%. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Efficiency

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Exploration of Novel Neuromorphic Methodologies for materials applications

Exploration of Novel Neuromorphic Methodologies for Material...

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Neuromorphic systems (ICONS), International conference on

作者： Derek Gobin Shay Snyder Guojing Cong Shruti R. Kulkarni Catherine Schuman Maryam Parsa George Mason University Fairfax VA USA Oak Ridge National Laboratory Oak Ridge TN USA University of Tennessee - Knoxville Knoxville TN USA

ISBN: (数字)9798350368659

ISBN: (纸本)9798350368666

Many of today's most interesting questions involve understanding and interpreting complex relationships within graph-based structures. For instance, in materials science, predicting material properties often relies on analyzing the intricate network of atomic interactions. Graph neural networks (GNNs) have emerged as a popular approach for these tasks; however, they suffer from limitations such as inefficient hardware utilization and over-smoothing. Recent advancements in neuromorphic computing offer promising solutions to these challenges. In this work, we evaluate two such neuromorphic strategies known as reservoir computing and hyperdimensional computing. We compare the performance of both approaches for bandgap classification and regression using a subset of the materials Project dataset. Our results indicate recent advances in hyperdimensional computing can be applied effectively to better represent molecular graphs.

关键词： materials science and technology photonic band gap Neuromorphic engineering Reservoir computing Hardware Graph neural networks Material properties

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Engineering Quantum Dots: Overcoming Challenges in Telecommunications and Human-Machine Interaction

Engineering Quantum Dots: Overcoming Challenges in Telecommu...

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Learning and Technology conference (L&T)

作者： M. A Majid Electrical and Computer Engineering Department College of Engineering Effat University

ISBN: (数字)9798331532215

ISBN: (纸本)9798331532222

Engineering the inhomogeneity, density, composition, and aspect ratio of self-assembled quantum dots (SAQDs) is essential for various applications, from broadband technologies to telecommunications. This paper investigates the optimization of molecular beam epitaxy (MBE) grown quantum dots in the intrinsic region of optoelectronic devices, such as lasers, highlighting the need for tailored approaches based on specific applications. For instance, superluminescent diodes used for imaging require highly inhomogeneous dots, while inhomogeneity can pose challenges for SAQD lasers in telecommunications, as non-homogeneous QDs may become parasitic and hinder lasing efficiency. This study explores quantum dot lasers by adjusting the thickness of the GaAs spacer layers, which are grown at low temperatures and situated between the dot layers. Our findings reveal enhanced performance in SAQD laser structures, achieving "no blue shift" in peak emission wavelengths—critical for human-machine interaction and photonic integrated circuit applications. Maintaining stable emission wavelengths significantly boosts the efficiency of communication systems and quantum computing platforms, facilitating rapid data processing and interaction between machines and users.

关键词： Performance evaluation Human computer interaction Quantum dot lasers Quantum computing photonic integrated circuits Laser stability Nonhomogeneous media Telecommunications Laser applications Thermal stability

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Experimental Demonstration of Optical Modulation Format Identification Using SOI-based photonic Reservoir

Experimental Demonstration of Optical Modulation Format Iden...

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2023 Optical Fiber Communications conference and Exhibition, OFC 2023

作者： Von Hünefeld, Guillermo Ronniger, Gregor Seker, Enes Thomas, Rijil Safari, Pooyan Sackey, Isaac Khan, Md Mahasin Suckow, Stephan Lemme, Max Stahl, David Schubert, Colja Fischer, Johannes Karl Freund, Ronald HHI Fraunhofer Institute for Telecommunications Einsteinufer 37 Berlin10587 Germany Technical University of Berlin Photonic Communication Systems Berlin10587 Germany Advanced Microelectronic Center Aachen AMO GmbH Aachen52074 Germany RWTH Aachen University Electronic Devices Aachen52074 Germany ID Photonics GmbH Neubiberg85579 Germany

We experimentally show modulation format identification of optical signals using silicon-on-insulator (SOI) photonic-integrated-circuit-based reservoir. After 100-km SSMF transmission, we achieve identification of 32 ... 详细信息

ISBN: (纸本)9781957171180

关键词： Silicon on insulator technology

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Integrated Microprobes for Terahertz Near-Field Time-Domain Spectroscopy 47

Integrated Microprobes for Terahertz Near-Field Time-Domain ...

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47th International conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

作者： Sosa, Maira Beatriz Perez Jumaah, Alaa Jabbar Monroy, Idelfonso Tafur Rivas, Jaime Gomez Al-Daffaie, Shihab Eindhoven Univ Technol Dept Elect Engn Groene Loper 5 NL-5612 AE Eindhoven North Brabant Netherlands

ISBN: (纸本)9781728194271

Despite the large range of promising applications for Terahertz technology, its real deployment has been limited by bulky equipment, mechanical disturbance, high power consumption, and low flexibility systems. Here, we present the design of a THz platform based on photonic integrated devices and photoconductive antennas that can reduce the footprint of all discrete optics in THz spectroscopy systems by two orders of magnitude. The integrated platform aims to contribute to the technological bridge that will take the THz spectrum from bulky systems to on-chip platforms.

关键词： Bridges Spectroscopy Power demand Terahertz materials Optics System-on-chip Time-domain analysis

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