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Recognition of Greek Alphabet Characters with Memristive Neuromorphic Circuit

Recognition of Greek Alphabet Characters with Memristive Neu...

Metrology for Extended Reality, Artificial Intelligence and Neural engineering (MetroXRAINE), IEEE International Conference on

作者： Theodoros Panagiotis Chatzinikolaou Ioannis K. Chatzipaschalis Karolos-Alexandros Tsakalos Rafailia-Eleni Karamani Iosif-Angelos Fyrigos Stavros Kitsios Panagiotis Bousoulas Dimitris Tsoukalas Georgios Ch. Sirakoulis Department of Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece Department of Electronic Engineering Universitat Politécnica de Catalunya Barcelona Spain Department of Applied Physics National Technical University of Athens Athens Greece

Pattern recognition is a critical aspect of modern computing and artificial intelligence, enabling robotic and computing systems to classify and categorize information based on its patterns and relationships. In this context, memristors are emerging as a promising new type of device for pattern recognition due to their memory capabilities as non-volatile two-terminal elements and in-memory computing potential. In this work, we present a novel approach to character recognition using CBRAM memristors by combining traditional machine learning techniques with a memristor-based oscillator exhibiting neuromorphic properties. The proposed approach demonstrates the feasibility of a pattern recognition specific hardware based on memristors that can be integrated in edge computing applications, aiming to bring computation and data storage closer to the source of data, rather than relying on centralized data centers, and consequently, leading to improved latency, increased reliability, and reduced costs.

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High-Efficiency InGaP-on-Silicon Frequency Downconversion for Quantum Communication Applications at 1550 nm

High-Efficiency InGaP-on-Silicon Frequency Downconversion fo...

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2025 IEEE Silicon Photonics Conference, SiPhotonics 2025

作者： Ahler, Lucas C. Ulsig, Emil Z. Stanton, Eric J. Godoy, Pedro H. Stanton, Maiya A. Weight, Skyler K. Leger, Alexandre Z. Nader, Nima Degli-Eredi, Iterio Hamel, Deny R. Mirin, Richard P. Volet, Nicolas Aarhus University Department of Electrical and Computer Engineering Aarhus8200 Denmark EMode Photonix BoulderCO80305 United States University of Colorado Department of Physics BoulderCO80309 United States National Institute of Standards and Technology Applied Physics Division BoulderCO80305 United States Université de Moncton Département de Physique et D'astronomie Moncton Canada Luceda Photonics Dendermonde Belgium

ISBN: (纸本)9798331506186

Efficient down-conversion in InGaP-on-silicon waveguides enables single-photon conversion from 930 nm to 1550 nm (C-band), advancing scalable, CMOS-compatible quantum communication and sensing from quantum dots. This integration showcases a promising approach for high-performance, monolithically integrated quantum frequency converters in photonic platforms. © 2025 IEEE.

关键词： CMOS integrated circuits

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Bright-dark pulses in coupled ring lasers

Bright-dark pulses in coupled ring lasers

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Letsou, Theodore P. Kazakov, Dmitry Ratra, Pawan Columbo, Lorenzo L. Cin, Sandro Dal Opacak, Nikola Piccardo, Marco Schwarz, Benedikt Capasso, Federico Harvard John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Electrical and Electronic Engineering Imperial College London Exhibition Rd South Kensington LondonSW7 2BX United Kingdom Dipartimento di Elettronica e Telecomunicazioni Politecnico di Torino Torino10129 Italy Institute of Solid State Electronics TU Wien Vienna1040 Austria Department of Physics Instituto Superior Técnico Universidade de Lisboa Lisbon1049-001 Portugal

Coupling semiconductor laser together unlocks new optical states unstable in uncoupled lasers. Here, we present one such state which manifests itself as a pair of bright and dark optical pulses. © 2024 The Author... 详细信息

ISBN: (纸本)9781957171395

关键词： Ring lasers

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Synthetic helicoidal rotation of a quasielectrostatic ring resonator for ultrabroadband magnet-free nonreciprocity

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Physical Review applied 2024年第6期22卷 064020-064020页

作者： Aravind Nagulu Ahmed Mekawy Mykhailo Tymchenko Dimitrios Sounas Harish Krishnaswamy Andrea Alù Department of Electrical and Systems Engineering Washington University in St. Louis St. Louis Missouri 63130 USA Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 USA Department of Electrical Engineering Wayne State University Detroit Michigan 48202 USA Department of Electrical Engineering Columbia University New York New York 10027 USA Physics Program Graduate Center City University of New York New York New York 10016 USA

Suitably tailored forms of spatiotemporal modulation in electronic circuit networks have been recently employed to overcome fundamental challenges in modern electronic systems, including breaking reciprocity, squeezing the footprint of high-Q resonators, and overcoming the delay-bandwidth limit. Rotating patterns of temporal modulations have been used to synthesize angular momentum, which replaces magnetic bias to break reciprocity in integrated circuits. However, this approach is limited by trade-offs between modulation speed, footprint, and bandwidth of operation. Rotating switching patterns in commutated capacitor networks also enables compact filters and quasielectrostatic wave propagation, overcoming the delay-bandwidth limit. In this paper, we combine these mechanisms in an integrated-circuit ring that synthetically rotates in two dimensions, realizing an effective helicoidal motion that provides ultrabroadband quasielectrostatic nonreciprocal responses fitting within a theoretically infinitesimal size. We also analyze the impact of modulation signal noise on time-modulated nonreciprocal components and unveil the role of a dynamic noise mechanism based on which the noise level increases in the presence of a strong signal passing through the component, along with methods to mitigate this effect. We experimentally verify these principles in a three-port integrated circulator based on a 65-nm CMOS process that operates from dc to 1 GHz with a miniaturization factor of 2 × 106.

关键词： Metamaterials Non-reciprocal transmission Photonics Topolectrical circuits

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Comparison of Coherent and Incoherent Donut Beams for Deep Tissue STED Microscopy

Comparison of Coherent and Incoherent Donut Beams for Deep T...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Thariq Shanavas Robert R. McLeod Mark E. Siemens Juliet T. Gopinath Department of Physics University of Colorado Boulder CO USA Department of Electrical Computer and Energy Engineering University of Colorado Boulder CO USA Department of Physics University of Denver Denver CO Materials Science Engineering Program University of Colorado Boulder CO USA

We numerically compare the null quality for STED microscopy generated by Laguerre-Gaussian beams with orbital angular momentum and donut beams generated by incoherent addition of orthogonal Hermite Gaussian beams when... 详细信息

ISBN: (纸本)9781957171258

关键词： Biological imaging Gaussian beams Microscopy Spatial light modulators Spiral phase Step index fibers

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Radiomap Inpainting for Restricted Areas based on Propagation Priority and Depth Map

arXiv

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arXiv 2023年

作者： Zhang, Songyang Yu, Tianhang Choi, Brian Senior, Feng Ouyang Ding, Zhi Department of Electrical and Computer Engineering University of California DavisCA95616 United States Johns Hopkins University Applied Physics Laboratory LaurelMD20723 United States

Providing rich and useful information regarding spectrum activities and propagation channels, radiomaps characterize the detailed distribution of power spectral density (PSD) and are important tools for network planning in modern wireless systems. Generally, radiomaps are constructed from radio strength measurements by deployed sensors and user devices. However, not all areas are accessible for radio measurements due to physical constraints and security consideration, leading to non-uniformly spaced measurements and blanks on a radiomap. In this work, we explore distribution of radio spectrum strengths in view of surrounding environments, and propose two radiomap inpainting approaches for the reconstruction of radiomaps that cover missing areas. Specifically, we first define a propagation-based priority and integrate exemplar-based inpainting with radio propagation model for fine-resolution small-size missing area reconstruction on a radiomap. Then, we introduce a novel radio depth map and propose a two-step template-perturbation approach for large-size restricted region inpainting. Our experimental results demonstrate the power of the proposed propagation priority and radio depth map in capturing the PSD distribution, as well as the efficacy of the proposed methods for radiomap reconstruction. © 2023, CC BY.

关键词： Radio waves

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Design of Ultra-Wideband Antipodal Vivaldi Antenna with Improving Impedance Matching using Elliptical Stub for GPR Applications

Design of Ultra-Wideband Antipodal Vivaldi Antenna with Impr...

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International electrical engineering Congress (iEECON)

作者： Patchadaporn Sangpet Wanchalerm Chanwattanapong Chayapol Sangmook Chatree Mahatthanajatuphat Thinnawat Jangjing Nonchanutt Chudpooti Paitoon Rakluea Norakamon Wongsin Department of Electronics and Telecommunication Engineering Faculty of Engineering Rajamangala University of Technology Thanyaburi Thailand Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut's University of Technology North Bangkok Bangkok Thailand

ISBN: (数字)9798331543952

ISBN: (纸本)9798331543969

This paper presents the design of an Antipodal Vivaldi Antenna (AVA) including open elliptical stubs on either side to improve impedance matching at lower frequencies. The stubs further serve as reflectors at 300 MHz, significantly enhancing the antenna gain across the specified frequency ranges. The Antipodal Vivaldi Antenna, measuring 552 × 700 × 1.6 mm 3 , is analyzed and evaluated to determine its characteristics. It possesses ultra-wideband characteristics, providing it suitable for signal exploration systems, and operates effectively throughout the 298–3000 MHz frequency range, which corresponds to the frequencies utilized by GPR technology. The suggested antenna demonstrates directed radiation patterns at all operational frequencies, achieving an average gain of 8.5 dBi.

关键词： Antenna measurements electrical engineering Impedance matching Vivaldi antennas Reflector antennas Ultra wideband antennas Frequency measurement Reflection coefficient Gain Antenna radiation patterns

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Dark Current and Single Photon Detection by 1550 nm Avalanche Photodiodes: Dead Time Corrected Probability Distributions

Dark Current and Single Photon Detection by 1550 nm Avalanch...

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Optica Quantum 2.0 Conference and Exhibition, Quantum 2.0

作者： Menkart, Nicole Hart, Joseph D. Murphy, Thomas E. Roy, Rajarshi Department of Electrical & Computer Engineering University of Maryland College Park College ParkMD20742 United States Institute for Research in Electronics and Applied Physics University of Maryland College Park College ParkMD20742 United States Optical Sciences Division U.S. Naval Research Laboratory WashingtonDC20375 United States Department of Physics University of Maryland College Park College ParkMD20742 United States

We present the first a pplication o f t he M andel a lgorithm t o r eal d ata from single-photon avalanche photodiodes (SPAD) to produce dead-time corrected probability distributions that are Poisson in nature to exam... 详细信息

ISBN: (纸本)9781957171272

关键词： Avalanche photodiodes Distributed feedback lasers Light sources Photon counting Quantum information Single-photon avalanche diodes

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Miniaturization of Dimensions Based on Square Loop Resonator with NP Fractal Model for Sensor Applications

Miniaturization of Dimensions Based on Square Loop Resonator...

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International electrical engineering Congress (iEECON)

作者： Nutyada Nantapanich Norakamon Wongsin Nipont Tangthong Chawalit Rakluea Paitoon Rakluea Wanchalerm Chanwattanapong Nonchanutt Chudpooti Chatree Mahatthanajatuphat Department of Electronics and Telecommunication Engineering Faculty of Engineering Rajamangala University of Technology Thanyaburi Thailand Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut's University of Technology North Bangkok Bangkok Thailand Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand

ISBN: (数字)9798331543952

ISBN: (纸本)9798331543969

This paper proposes a reduction in the dimensions of a square loop resonator via the utilization of fractal techniques. The 2 nd order NP fractal model is investigated to minimize the dimensions of the square loop resonator. The suggested fractal resonator is indirectly fed via the coupling line encircling the resonator to enhance impedance matching. The suggested fractal resonator has a frequency response of 2.936 GHz, with |S11| and |S21| evaluated at -16.17 dB and -2.09 dB, respectively. The dimensions of the suggested fractal resonator are 10.5×10.5 mm 2 , representing a reduction of roughly 56.9% compared to the square loop resonator. Consequently, the suggested fractal resonator may serve as a sensor for the measuring instrument.

关键词： electrical engineering Couplings Instruments Impedance matching Fractals Frequency response

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Multilayer CVD graphene electrodes using a transfer-free process for the next generation of optically transparent and MRI-compatible neural interfaces

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Microsystems & Nanoengineering 2022年第5期8卷 183-196页

作者： Nasim Bakhshaee Babaroud Merlin Palmar Andrada Iulia Velea Chiara Coletti Sebastian Weingärtner Frans Vos Wouter A.Serdijn Sten Vollebregt Vasiliki Giagka Department of Microelectronics Faculty of Electrical EngineeringMathematics and Computer ScienceDelft University of TechnologyMekelweg 4Delft 2628 CDThe Netherlands Technologies for Bioelectronics Group Department of System Integration and Interconnection TechnologiesFraunhofer Institute for Reliability and Micro-integration IZMGustav-Meyer-Allee 25Berlin 13355Germany Department of Imaging Physics Faculty of Applied ScienceDelft University of TechnologyLorentzweg 1Delft 2628 CJThe Netherlands Erasmus University Medical Center(Erasmus MC) dr.Molewaterplein 40Rotterdam 3015 GDThe Netherlands

Multimodal platforms combining electrical neural recording and stimulation,optogenetics,optical imaging,and magnetic resonance(MRI)imaging are emerging as a promising platform to enhance the depth of characterization in neuroscientific *** conductive,optically transparent,and MRI-compatible electrodes can optimally combine all *** as a suitable electrode candidate material can be grown via chemical vapor deposition(CVD)processes and sandwiched between transparent biocompatible ***,due to the high graphene growth temperature(≥900℃)and the presence of polymers,fabrication is commonly based on a manual transfer process of pre-grown graphene sheets,which causes reliability *** this paper,we present CVD-based multilayer graphene electrodes fabricated using a wafer-scale transfer-free process for use in optically transparent and MRI-compatible neural *** fabricated electrodes feature very low impedances which are comparable to those of noble metal electrodes of the same size and *** also exhibit the highest charge storage capacity(CSC)reported to date among all previously fabricated CVD graphene *** graphene electrodes did not reveal any photo-induced artifact during 10-Hz light pulse ***,we show here,for the first time,that CVD graphene electrodes do not cause any image artifact in a 3T MRI *** results demonstrate that multilayer graphene electrodes are excellent candidates for the next generation of neural interfaces and can substitute the standard conventional metal *** fabricated graphene electrodes enable multimodal neural recording,electrical and optogenetic stimulation,while allowing for optical imaging,as well as,artifact-free MRI studies.

关键词： transparent transfer process

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