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2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023

作者： Schumer, Alexander Nasari, Hadiseh Liu, Yuzhou G.N. Lopez-Galmiche, Gisela Leshin, Jason Lopez-Aviles, Helena E. Ding, Lei Alahmadi, Yousef Hassan, Absar U. Zhong, Qi Rotter, Stefan LiKamWa, Patrick Christodoulides, Demetrios N. Khajavikhan, Mercedeh ViennaA-1040 Austria Ming Hsieh Department of Electrical and Computer Engineering University of Southern California Los AngelesCA90089 United States CREOL The College of Optics & Photonics University of Central Florida OrlandoFL United States Center of Excellence for Telecomm Applications Joint Centers of Excellence Program King Abdul Aziz City for Science and Technology Riyadh11442 Saudi Arabia Department of Physics & Astronomy University of Southern California Los AngelesCA United States

ISBN: (纸本)9798350345995

When non-Hermitian eigenvalue surfaces form intertwined Riemann surfaces, the corresponding non-Hermitian singularities, also know as exceptional points (EPs), are located at the center of this specific topology. Various experimental platforms have recently been presented in which interesting new physics associated with these branch point singularities can be explored. In particular, it has been shown that dynamically encircling EPs may lead to a so-called chiral state transfer. The chirality in this context refers to the fact that in such an encircling protocol, the final state at the end of an EP-enclosing loop solely depends on the encircling direction (clockwise or counterclockwise), but not on the initial state. Such a chiral behavior is intrinsically linked to the state vector deviating from adiabatically following the system's eigenstates associated with the eigenvalue surfaces;instead, due to the non-Hermitian violation of the adiabatic theorem, non-adiabatic jumps let the system undergo transitions from lossy eigenstates to eigenstates with gain. Here, we present two experiments that implement concepts that go beyond this established paradigm. © 2023 IEEE.

关键词： Topology

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electrical Control of Gigahertz Frequency Phonons on Chip

Electrical Control of Gigahertz Frequency Phonons on Chip

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Quantum 2.0, QUANTUM 2022

作者： Shao, Linbo Zhu, Di Colangelo, Marco Lee, Daehun Sinclair, Neil Hu, Yaowen Rakich, Peter T. Lai, Keji Berggren, Karl K. Lončar, Marko John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States Bradley Department of Electrical and Computer Engineering Virginia Tech 1185 Perry Street BlacksburgVA24061 United States Singapore138634 Singapore Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA01239 United States Department of Physics University of Texas at Austin AustinTX78712 United States California Institute of Technology PasadenaCA91125 United States Department of Physics Harvard University CambridgeMA02138 United States Department of Applied Physics Yale University New HavenCT06520 United States

Acoustic waves at microwave frequencies have been recently emerged as versatile information carriers in quantum applications. Here, we demonstrate electrical control of traveling acoustic waves on an integrated lithiu... 详细信息

ISBN: (纸本)9781957171111

关键词： Acoustic waves

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Reliability of Electronic Connections in Fast Chargers of Electric Vehicle

Reliability of Electronic Connections in Fast Chargers of El...

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Advances in computer Science, electrical, Electronics, and Communication Technologies (CE2CT), International Conference on

作者： Priyanka Raturi Semwal Shubham Rajendra Ekatpure Merlyn Sharma Neelima Singh Anil Kumar Bhumika Pandey Department of Electrical & Electronics Engineering Tula's Institute Dehradun Dehradun India Global Supply Chain in Semiconductor Manufacturing Kulicke and Soffa Pennsylvania USA Department of ASH IIMT College of Engineering Grater Noida UP Department of Computer Science and Engineering Uttaranchal University Dehradun India Dept. of Applied Science Physics Bharati Vidyapeeth's College of Engineering New Delhi India Department of ECE Bipin Tripathi Kumaon Institute of Technology Dwarahat Almora India

ISBN: (数字)9798331518578

ISBN: (纸本)9798331518585

Global mobility is undergoing a dramatic change as cars fuelled by fossil fuels give way to those with zero or extremely low tailpipe emissions. Every one of the parts in big battery packs normally don't have similar properties and may corrupt essentially in view of assembling fluctuation and different elements. The performance and economics of the entire battery pack are impacted by the increased power waste from degraded battery modules. Additionally, the influence changes depending on the trip pattern. A variety of important factors, such as the age of the car, the internal resistance of the lithium-ion battery pack, awareness of grid energy pricing, and the distance driven, affect how much an electric vehicle (EV) costs to drive every day. It has used the grid's energy price data to optimise the cost of the typical driving cycle. Accurately forecasting battery behaviour reliability for the daily driving cycle is the aim of this project. The driver will be able to determine the best charging schedules, driving energy consumption, and excess battery energy with the aid of the reliability battery behaviour forecast. The driver can reduce the cost of travel both daily and over the battery's lifespan by having a previous understanding of the battery's behaviour, the grid's energy pricing, and the trip's duration.

关键词： Resistance Schedules Costs Pricing Voltage Standardization Electric vehicles Inverters Batteries Automobiles

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Optical modeling, solver, and design of wafer-scale single-enantiomer carbon nanotube film and reconfigurable chiral photonic device

arXiv

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arXiv 2024年

作者： Fan, Jichao Hillam, Benjamin Guo, Cheng Fujinami, Hiroyuki Koki, Shiba Xie, Haoyu Chen, Ruiyang Yanagi, Kazuhiro Gao, Weilu Department of Electrical and Computer Engineering The University of Utah 50 S Central Campus Drive Salt Lake CityUT84112 United States Department of Applied Physics Stanford University 348 Via Pueblo StanfordCA94305 United States Department of Physics Tokyo Metropolitan University 1-1 Minami-Osawa Hachioji-shi Tokyo192-0397 Japan

The interaction of circularly polarized light with chiral matter and functional devices enables novel phenomena and applications. Recently, wafer-scale solid-state single-enantiomer carbon nanotube (CNT) films have become feasible and are emerging as a chiral photonic material platform thanks to their quantum-confinement-induced optical properties and facile scalable assembly. However, optical modeling, solver, and device design tools for such materials are non-existent. Here, we prepare wafer-scale single-enantiomer (6,5) and (11,-5) randomly oriented CNT films and create an optical material model based on measured experimental optical spectra. We also implement a highly-parallel graphic-processing-unit accelerated transfer matrix solver for general bi-anisotropic materials and layered structures. Further, we demonstrate reconfigurable chiral photonic devices in a heterostructure with phase change materials through machine learning-enabled efficient gradient-based inverse design and optimization. Our developed full stack of a chiral photonic material and device hardware platform and a corresponding high-performance differential-programming-enabled solver opens the door for future chiral photonic devices and applications based on single-enantiomer CNT films. © 2024, CC BY.

关键词： Photonic devices

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Amplification and ellipticity enhancement of high-order harmonics in a neonlike x-ray laser dressed by an IR field

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Physical Review A 2023年第6期107卷 063511-063511页

作者： V. A. Antonov I. R. Khairulin M. Yu. Ryabikin M. A. Berrill V. N. Shlyaptsev J. J. Rocca Оlga Kocharovskaya Institute of Applied Physics of the Russian Academy of Sciences 46 Ulyanov Street Nizhny Novgorod 603950 Russia Lobachevsky State University of Nizhny Novgorod 23 Prospekt Gagarina Nizhny Novgorod 603950 Russia Department of Electrical and Computer Engineering Colorado State University Fort Collins Colorado 80523 USA Department of Physics Colorado State University Fort Collins Colorado 80523 USA Department of Physics and Astronomy and Institute for Quantum Science and Engineering Texas A&M University 578 University Drive College Station Texas 77843-4242 USA

In Khairulin et al. [Sci. Rep. 12, 6204 (2022)] we proposed a method for amplifying a train of sub-femtosecond pulses of circularly or elliptically polarized extreme ultraviolet radiation, composed by high-order harmonics of an infrared (IR) laser field, in a neonlike active medium of a plasma-based x-ray laser, additionally irradiated with a replica of a fundamental frequency laser field used to generate harmonics. Here we present the analytical theory and numerical study of an amplification process of an individual harmonic with either preservation of its polarization state or ellipticity enhancement. We also analyze in detail the spectral-temporal and polarization properties of a sub-femtosecond pulse train formed by a set of elliptically or circularly polarized harmonics during the propagation through the medium. We discuss also the possibility of an experimental implementation of the suggested technique in an active medium of an x-ray laser based on neonlike Ti12+ ions irradiated by an IR laser field with a wavelength of 3.2 µm.

关键词： Nonlinear optics Strong electromagnetic field effects Ultrafast optics X-ray beams & optics

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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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IEEE International Conference on Group IV Photonics

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

ISBN: (数字)9798331506186

ISBN: (纸本)9798331506193

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.

关键词： C-band Quantum dots Multichip modules Frequency conversion Silicon photonics Sensors Quantum communication

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Hundredfold increase of stimulated Brillouin-scattering bandwidth in whispering-gallery mode resonators

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Photonics Research 2023年第6期11卷 917-924页

作者： GUOPING LIN JINGYI TIAN TANG SUN QINGHAI SONG YANNE K.CHEMBO Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System School of ScienceHarbin Institute of TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen 518055China Department of Electrical and Computer Engineering&Institute for Research in Electronics and Applied Physics(IREAP) University of MarylandCollege ParkMaryland 20742USA

Backward stimulated Brillouin scattering(SBS)is widely exploited for various applications in optics and *** typically features a narrow gain bandwidth of a few tens of megahertz in fluoride *** we report a hundredfold increase of SBS bandwidth in whispering-gallery mode *** crystalline orientation results in a large variation of the acoustic phase velocity upon propagation along the periphery,from which a broad Brillouin gain is *** 2.5 GHz wide Brillouin gain profile is theoretically found and experimentally *** phenomena with Brillouin shift frequencies ranging from 11.73 to 14.47 GHz in ultrahigh Q Z-cut magnesium fluoride cavities pumped at the telecommunication wavelength are ***,the Brillouin-Kerr comb in this device is *** 400 comb lines spanning across a spectral window of 120 nm are *** finding paves a new way for tailoring and harnessing the Brillouin gain in crystals.

关键词： scattering pumped Brillouin

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Distinguishing erbium dopants in Y2O3 by site symmetry: Ab initio theory of two spin-photon interfaces

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Physical Review Materials 2023年第12期7卷 126201-126201页

作者： Churna Bhandari Cüneyt Şahin Durga Paudyal Michael E. Flatté Ames National Laboratory Iowa State University Ames Iowa 50011 USA UNAM–National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology Bilkent University Ankara Turkey Department of Physics and Astronomy University of Iowa Iowa City Iowa 52242 USA Department of Electrical and Computer Engineering Iowa State University Ames Iowa 50011 USA Department of Applied Physics Eindhoven University of Technology Eindhoven The Netherlands

We present a first-principles study of the defect formation and electronic structure of erbium (Er)–doped yttria (Y2O3). This is an emerging material for spin-photon interfaces in quantum information science due to the narrow-linewidth optical emission from Er dopants at standard telecommunication wavelengths and their potential for quantum memories and transducers. We calculate formation energies of neutral and negatively and positively charged Er dopants and find the charge-neutral configuration to be the most stable, consistent with experiment. Of the two substitutional sites of Er for Y, the C2 (more relevant for quantum memories) and C3i (more relevant for quantum transduction), we identify the former as possessing the lowest formation energy. The electronic properties are calculated using the Perdew-Burke-Ernzerhof functional along with the Hubbard U parameter and spin-orbit coupling, which yields a ∼6μB orbital and a ∼3μB spin magnetic moment, and 11 electrons in the Er 4f shell, confirming the formation of charge-neutral Er3+. This standard density functional theory approach underestimates the band gap of the host and lacks a first-principles justification for U. To overcome these issues we performed screened hybrid functional calculations, including a negative U for the 4f orbitals, with mixing (α) and screening (w) parameters. These produced robust electronic features with slight modifications in the band gap and the 4f splittings depending on the choice of tuning parameters. We also computed the many-particle electronic excitation energies and compared them with experimental values from photoluminescence.

关键词： First-principles calculations

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Why Room Temperature GeSn Lasers Need Carbon

Why Room Temperature GeSn Lasers Need Carbon

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IEEE International Conference on Group IV Photonics

作者： Tuhin Dey Augustus W. Arbogast Qian Meng Shamim Reza Aaron Muhowski Joshua Cooper Rachel S. Goldman Thales Borrely Seth R. Bank Mark A. Wistey Materials Science Engineering and Commercialization Program Texas State University San Marcos Texas USA Department of Physics Texas State University San Marcos Texas USA Department of Electrical and Computer Engineering University of Texas at Austin Austin Texas USA Department of Materials Science and Engineering University of Michigan Ann Arbor MI USA Departments of MSE Physics and EECS University of Michigan Ann Arbor MI USA Department of Physics and MSEC Program Texas State University San Marcos Texas USA

Device models show GeSn lasers are limited by weak electron and photon confinement. Adding carbon offers strong conduction band offsets, freeing SiGeSn layers for separate confinement heterostructures, reducing thresh...

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Dynamic Analysis of a Hyperchaotic Hyperjerk Circuit, FPGA Implementation and Its Application in RNG for Medical Images Encryption

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Transactions of the Indian National Academy of engineering 2022年第3期7卷 753-773页

作者： Feudjio, E. R. Tamba, V. Kamdoum Tagne, F. Kapche Tchendjeu, A. E. Tchahou Djatche, G. P. Biamou, A. L. Mbanda Fotsin, H. B. Research Unit of Automation and Applied Computer (URAIA) Department of Electrical Engineering IUT-FV Bandjoun University of Dschang Bandjoun Cameroon Research Unit of Condensed Matter Electronics and Signal Processing (URMACETS) Department of Physics University Of Dschang Dschang Cameroon Department of Computer Engineering National Polytechnic Institute University of Bamenda Bambili Cameroon

Nonlinear systems with high dimension have received considerable attention recently due to their possibility to exhibit complex dynamics including chaos, hyperchaos, pattern formation, self-organization, and other related dynamics. In this work, a novel four dimensional autonomous hyperchaotic hyperjerk circuit with hyperbolic sine and quintic nonlinearities is proposed and its corresponding dynamics is analyzed theoretically, numerically and experimentally. Using Kirchhoff’s laws, the state equations of the proposed hyperchaotic hyperjerk circuit are described. Some fundamental properties of the model including symmetry, dissipation, equilibrium points and their stability are examined. Bifurcation diagrams, Lyapunov exponent spectrum and phase portraits are plotted to point out the complex dynamical behaviors exhibited by the system. The numerical results are validated using PSpice-based circuit simulations and Field-programmable Gate Array (FPGA) implementations. In addition, to use the proposed hyperchaotic hyperjerk circuit for medical images encryption, a random number generator (RNG) is designed. The resulting random number generator (RNG) successfully passes the National Institute of Standards and Technology (NIST-800-22) statistical tests. This confirms that the proposed hyperchaotic hyperjerk circuit is effective in showing randomness. Finally, a medical images encryption algorithm is developed based on the generated random bits. The security performances analyses are performed and the results show that the proposed algorithm can effectively encrypt and decrypt medical images with better security performances.

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