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12th International Conference on Modern Circuits and Systems Technologies, MOCAST 2023

作者： Siniosoglou, Ilias Xouveroudis, Konstantinos Argyriou, Vasileios Lagkas, Thomas Goudos, Sotirios K. Psannis, Konstantinos E. Sarigiannidis, Panagiotis University of Western Macedonia Department of Electrical and Computer Engineering Kozani Greece MetaMind Innovations P.C. R&D Department Kozani Greece Kingston University Department of Networks and Digital Media KingstonUpon Thames United Kingdom International Hellenic University Department of Computer Science Greece Aritostle University of Thessaloniki Physics Department Thessaloniki Greece University of Macedonia School of Information Sciences Department of Applied Informatics Thessaloniki Greece

ISBN: (纸本)9798350321074

In regards to the field of trend forecasting in time series, many popular Deep Learning (DL) methods such as Long Short Term Memory (LSTM) models have been the gold standard for a long time. However, depending on the domain and application, it has been shown that a new approach can be implemented and possibly be more beneficial, the Transformer deep neural networks. Moreover, one can incorporate Federated Learning (FL) in order to further enhance the prospective utility of the models, enabling multiple data providers to jointly train on a common model, while maintaining the privacy of their data. In this paper, we use an experimental Federated Learning System that employs both Transformer and LSTM models on a variety of datasets. The sytem receives data from multiple clients and uses federation to create an optimized global model. The potential of Federated Learning in real-time forecasting is explored by comparing the federated approach with conventional local training. Furthermore, a comparison is made between the performance of the Transformer and its equivalent LSTM in order to determine which one is more effective in each given domain, which shows that the Transformer model can produce better results, especially when optimised by the FL process. © 2023 IEEE.

关键词： Forecasting

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Temporal Shaping of Light at the Nanoscale with Photonic Funnels

Temporal Shaping of Light at the Nanoscale with Photonic Fun...

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Conference on Lasers and Electro-Optics (CLEO)

作者： J. LaMountain A. Raju A. Briggs D. Wasserman V.A. Podolskiy Department of Physics and Applied Physics University of Massachusetts Lowell One University Avenue Lowell MA USA Department of Electrical and Computer Engineering University of Texas Austin Austin Texas USA

Photonic funnels have been demonstrated as a flexible platform to confine light to deep subwavelength spatial areas. Here we consider the utility of this platform to provide temporal, as well as spatial, light shaping.

ISBN: (纸本)9781957171258

关键词： Diffraction limit Discrete Fourier transforms Electromagnetic radiation Free space optics Optical fields Optical materials

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Scalability analysis and switching hardware requirements for a novel multi-granular SDM/UWB 10 Pbps optical node

Scalability analysis and switching hardware requirements for...

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49th European Conference on Optical Communications (ECOC 2023)

作者： C. Papapavlou K. Paximadis H. Georgopoulos D. M. Marom I. Tomkos Department of Electrical & Computer Engineering University of Patras 26504 Patras Greece Institute of Applied Physics Hebrew University of Jerusalem 91904 Jerusalem Israel

Optical network node designs must change to address burgeoning traffic loads. We propose a novel, high-throughput, low-loss, reconfigurable, hierarchical architecture capable of switching whole fibres, flexible-defined bands, down to individual wavelengths, achieving ~10 Pb/s throughput, which will be required by decade end.

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Controllable multi-level switching of optical phase change materials via microheater temperature profile engineering

Controllable multi-level switching of optical phase change m...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Sun, Hongyi Lian, Chuanyu Vásquez-Aza, Francis Huang, Yi-Siou Vitale, Steven A. Takeuchi, Ichiro Hu, Juejun Youngblood, Nathan Pavlidis, Georges Ríos Ocampo, Carlos A. Department of Materials Science & Engineering University of Maryland College ParkMD20742 United States Institute for Research in Electronics and Applied Physics University of Maryland College ParkMD20742 United States Department of Mechanical Engineering University of Connecticut StorrsCT06269 United States Advanced Materials and Microsystems Group MIT Lincoln Laboratory LexingtonMA02139 United States Quantum Materials Center Department of Physics University of Maryland College ParkMD20742 United States Department of Materials Science & Engineering MIT CambridgeMA02139 United States Electrical & Computer Engineering Department The University of Pittsburgh PittsburghPA15213 United States

ISBN: (纸本)9781957171395

We demonstrate doped-silicon-on-insulator microheaters with triangle-like temperature profiles. Such devices control the hotspot size and temperature and, thus, the area that undergoes amorphization or crystallization in optical phase-change materials, leading to controllable multilevel, nonvolatile response. © Optica Publishing Group 2024 © 2024 The Author(s)

关键词： Optical materials

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Particle dynamics,black hole shadow and weak gravitational lensing in the f(Q)theory of gravity

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Communications in Theoretical physics 2023年第12期75卷 115-128页

作者： Allah Ditta Xia Tiecheng Farruh Atamurotov Ibrar Hussain G Mustafa Department of Mathematics Shanghai University and Newtouch Center for Mathematics of Shanghai UniversityShanghai200444ShanghaiChina New Uzbekistan University Movarounnahr Street 1Tashkent 100000Uzbekistan Central Asian University Milliy Bog’Street 264Tashkent 111221Uzbekistan Tashkent University of Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan Institute of Theoretical Physics National University of UzbekistanTashkent 100174Uzbekistan School of Electrical Engineering and Computer Science National University of Sciences and TechnologyH-12IslamabadPakistan Department of Physics Zhejiang Normal UniversityJinhua 321004China

We study the particle dynamics around a black hole(BH)in f(Q)***,we investigate the influence of the parameters of f(Q)gravity on the horizon structure of the BH,photon orbits and the radius of the innermost stable circular orbit(ISCO)of massive *** further study the effects of the parameters of f(Q)gravity on the shadow cast by the ***,we consider weak gravitational lensing using the general method,where we also explore the deflection angle of light rays around the BH in f(Q)gravity in uniform and nonuniform plasma mediums.

关键词： f(Q)gravity black holes photon motion shadow and lensing

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Plasmon-induced trap filling at grain boundaries in perovskite solar cells

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Light(Science & Applications) 2021年第11期10卷 2233-2244页

作者： Kai Yao Siqi Li Zhiliang Liu Yiran Ying Petr Dvořák Linfeng Fei TomášŠikola Haitao Huang Peter Nordlander Alex K-Y.Jen Dangyuan Lei Institute of Photovoltaics/Department of Materials Science and Engineering Nanchang UniversityNanchang330031China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Materials Science and Engineering City University of Hong KongKowloonHong KongChina Institute of Physical Engineering Brno University of TechnologyTechnická2Brno61669Czech Republic Laboratory for Nanophotonics Department of Physics and AstronomyDepartment of Electrical and Computer EngineeringRice UniversityHoustonTexas77005USA

The deep-level traps induced by charged defects at the grain boundaries(GBs)of polycrystalline organic-inorganic halide perovskite(OIHP)films serve as major recombination centres,which limit the device ***,we incorporate specially designed poly(3-aminothiophenol)-coated gold(Au@PAT)nanoparticles into the perovskite absorber,in order to examine the influence of plasmonic resonance on carrier dynamics in perovskite solar *** changes in the photophysical properties of the OIHP films reveal that plasmon excitation could fill trap sites at the GB region through photo-brightening,whereas transient absorption spectroscopy and density functional theory calculations correlate this photo-brightening of trap states with plasmon-induced interfacial *** a result,the device achieved the best efficiency of 22.0%with robust operational *** work provides unambiguous evidence for plasmon-induced trap occupation in OIHP and reveals that plasmonic nanostructures may be one type of efficient additives to overcome the recombination losses in perovskite solar cells and thin-film solar cells in general.

关键词： perovskite grain absorber

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Controllable multi-level switching of optical phase change materials via microheater temperature profile engineering

Controllable multi-level switching of optical phase change m...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

关键词： Amorphization

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Polarization-Dependent Forces and Torques at Resonance in a Microfiber-Microcavity System

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Physical Review Letters 2023年第18期130卷 183601-183601页

作者： Jinsheng Lu Vincent Ginis Cheng-Wei Qiu Federico Capasso Harvard John A. Paulson School of Engineering and Applied Sciences 9 Oxford Street Cambridge Massachusetts 02138 USA Data Lab and Applied Physics Vrije Universiteit Brussel 1050 Brussel Belgium Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore

Spin-orbit interactions in evanescent fields have recently attracted significant interest. In particular, the transfer of the Belinfante spin momentum perpendicular to the propagation direction generates polarization-dependent lateral forces on particles. However, it is still elusive as to how the polarization-dependent resonances of large particles synergize with the incident light’s helicity and resultant lateral forces. Here, we investigate these polarization-dependent phenomena in a microfiber-microcavity system where whispering-gallery-mode resonances exist. This system allows for an intuitive understanding and unification of the polarization-dependent forces. Contrary to previous studies, the induced lateral forces at resonance are not proportional to the helicity of incident light. Instead, polarization-dependent coupling phases and resonance phases generate extra helicity contributions. We propose a generalized law for optical lateral forces and find the existence of optical lateral forces even when the helicity of incident light is zero. Our work provides new insights into these polarization-dependent phenomena and an opportunity to engineer polarization-controlled resonant optomechanical systems.

关键词： Cooling & trapping Light-matter interaction Near-field optics Optical fibers Optomechanics

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Integrated microcomb with broadband tunable normal and anomalous dispersion

Integrated microcomb with broadband tunable normal and anoma...

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2023 Optica Nonlinear Optics Topical Meeting, NLO 2023

作者： Ji, Qing-Xin Jin, Warren Guo, Joel Wu, Lue Liu, Peng Feshali, Avi Paniccia, Mario Bowers, John Vahala, Kerry T. J. Watson Laboratory of Applied Physics California Institute of Technology PasadenaCA91125 United States Department of Electrical and Computer Engineering University of California Santa Barbara Santa BarbaraCA93106 United States Anello Photonics Santa ClaraCA United States

ISBN: (纸本)9781957171234

Broadband dispersion tuning (3.9 THz) with only modest resonant frequency tuning (20 GHz) is demonstrated in vernier-coupled optical resonators. Tuning from bright to dark-pulse comb states is demonstrated using a fixed-wavelength hybridly-integrated semiconductor laser pump. Optica Nonlinear Optics Topical Meeting 2023 © Optica Publishing Group 2023 © 2023 The Author(s)

关键词： Optical pumping

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Novel Bandpass and Periodic Frequency Responses in Non-Metallic Dielectric Metamaterials 12

Novel Bandpass and Periodic Frequency Responses in Non-Metal...

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12th International electrical engineering Congress, iEECON 2024

作者： Malathong, Kritthanit Konpang, Jessada Boonthum, Direk Akkaraekthalin, Prayoot Chudpooti, Nonchanutt Thitimahatthanakusol, Phatsakul Rajamangala University Of Technology Krungthep Faculty Of Engineering Department Of Electrical And Telecommunication Engineering 2 Nanglingee Rd. Sathorn Thungmahamek Bangkok10120 Thailand Rajamangala University Of Technology Krungthep Division Of Physics Faculty Of Science And Technology 2 Nanglingee Rd. Sathorn Thungmahamek Bangkok10120 Thailand Department Of Electrical And Computer Engineering Faculty Of Engineering King Mongkut's University Of Technology North Bangkok 1518 Pracharat 1 Road Bangsue Bangkok10800 Thailand King Mongkut's University Of Technology North Bangkok Faculty Of Applied Science Department Of Industrial Physics And Medical Instrumentation Bangkok10800 Thailand Rajamangala University Of Technology Isan Faculty Of Engineering And Technology Department Of Telecommunication Engineering 744 Sura Narai Rd Nai-muang Mueang Nakhon Ratchasima Nakorn Ratchasima30000 Thailand

ISBN: (纸本)9798350383591

This study explores the remarkable properties of the Box-Ball Structure (BBS) within the 1GHz to 50GHz frequency range. The BBS structure demonstrates consistent bandpass frequencies with a periodic response and maintains a uniform 2.058GHz bandwidth at S11 = -6dB. Unlike metal-based structures, where changing C and L values can lead to frequency-dependent responses, the dielectric BBS structure exhibits stability. Its dielectric properties, including epsilon, mu, and refractive index (n), remain largely unaffected by frequency variations. Furthermore, the BBS structure is found to induce capacitance (C), as per the principles of virtual circuit theory, making it suitable for band-pass filter applications. The liquid state of epoxy resin allows for versatile structural designs, such as a hollow cylinder for omnidirectional antenna signal filtration. This research introduces the BBS as a dielectric resonator with unique properties and potential applications in various industries, particularly in the mobile phone sector. © 2024 IEEE.

关键词： Capacitance

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