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

作者： Fang, Chengyu Kim, Minjeong Czaplewski, David A. Mei, Hongyan Deshpande, Sanket Yu, Zhaoning Xiao, Yuzhe Yang, Xuting Dibos, Alan M. Saffman, Mark Choy, Jennifer T. Kats, Mikhail A. Department of Electrical and Computer Engineering University of Wisconsin-Madison MadisonWI53706 United States Center for Nanoscale Materials Argonne National Laboratory LemontIL60349 United States Department of Physics University of Wisconsin-Madison MadisonWI53706 United States Department of Physics University of North Texas DentonTX76201 United States Department of Material Science and Engineering University of Wisconsin-Madison MadisonWI53706 United States

We report optical metasurfaces that enable bottle-beam arrays for blue-detuned trapping of neutral atoms. Our approach only requires a single metasurface which significantly reduces the complexity of the trapping expe... 详细信息

关键词： Atoms

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Nonsaturated large magnetoresistance and transport dynamics in a n-doped cryogenic WSe2 field-effect device

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Physical Review B 2025年第12期111卷 125307-125307页

作者： Wei-Chen Lin Ching-Chen Yeh Jia-Zhu Zou Nhat Anh Nguyen Phan Inayat Uddin Hai Yen Le Thi Kenji Watanabe Takashi Taniguchi Gil-Ho Kim Department of Engineering and System Science National Tsing Hua University Hsinchu 300 Taiwan Taiwan International Graduate Program Academia Sinica Taipei 115 Taiwan Department of Physics National Taiwan University Taipei 106 Taiwan Department of Electrical and Computer Engineering Sungkyunkwan University (SKKU) Suwon 164 Republic of Korea Sungkyunkwan Advanced Institute of Nano Technology (SAINT) Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan

Interest in the two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) continues to intensify, driven by their suitable band gaps to supplant silicon as next-generation semiconductor materials. Among various TMDs, tungsten diselenide (WSe2) is renowned for its superior electrical properties in carrier density and mobility under ambient conditions. Despite its notable attributes, the behavior of monolayer WSe2 in the electron-doped regime under cryogenic conditions remains largely uncharted, particularly concerning its magnetotransport properties. In this study, we reveal the transport mechanisms of monolayer WSe2 from high temperatures down to the cryogenic regime. As evident by Efros–Shklovskii variable-range hopping (E-S VRH) in the cryogenic regime, strong Coulomb interactions arise between electrons. Above 8 K, an uncommon nonsaturated quadratic large magnetoresistance (MR) can be explained by the wave-function shrinkage model, which is consistent with the E-S VRH transport mechanism. Notably, the nonsaturated quadratic large MR shows a magnitude up to 1740% at 13 T. These findings underscore the potential applications for monolayer WSe2 in cryogenic field-effect devices, magnetic sensors, and memory devices and mark a significant advance in magnetotransport research.

关键词： Monolayers

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Metasurfaces That Enable Bottle-Beam Arrays for Neutral Atom Trapping

Metasurfaces That Enable Bottle-Beam Arrays for Neutral Atom...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Atom lasers

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Exploring the science and Art of UAV Light Painting: From Equations and Pixels to Long-Exposure Photography

Exploring the Science and Art of UAV Light Painting: From Eq...

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International Conference on Unmanned Aircraft Systems (ICUAS)

作者： Leonardo A. Fagundes-Junior Celso O. Barcelos Raquel F. Vassallo Alexandre S. Brandão Department of Electrical Engineering Robotics Specialization Center Graduate Program on Computer Science Federal University of Viçosa Viçosa MG Brazil Department of Electrical Engineering Federal University of Espirito Santo Vitória ES Brazil

ISBN: (数字)9798350357882

ISBN: (纸本)9798350357899

The use of Unmanned Aerial Vehicles (in short, UAVs, aka drones) for cultural and entertainment purposes, such as drone light shows, has grown exponentially. One such innovative and creative application is the visual arts using drones to explore long-exposure photography. Light painting are generally performed indoors and outdoors in a dedicated space with a human using a moving light source to create spectacular images and save the movement perception in a picture. In this work, we propose a robotic perception system designed to choreograph UAV movements based on time-parametric curves or image edges, serving as reference motions. Our framework begins by processing a digital image, extracting its contours through boundary tracing, and subsequently generating a safe, navigable, and precise path for UAV motion planning. This process involves optimizing waypoints within the UAV workspace to determine a feasible trajectory that encompasses all designated points or computes safe trajectories utilizing established mathematical equations. The validation of the motion planning is performed through light painting, where the UAV can either fly through the motion reference to mimic the original image. The generated trajectories on light painting mode by physical robots are compared against the ground-truth demonstrating the accuracy of the applied control scheme.

关键词： Photography Visualization Art Autonomous aerial vehicles Trajectory Planning Robots

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Modified Kelvin-Voigt fractional derivative model for viscoelasticity measurement in optical coherence elastography

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Chinese Optics Letters 2025年第1期23卷 93-101页

作者： Chenming Yang Zhongliang Li Nan Nan Teng Liu Yaoli Luo Xiangzhao Wang Advanced Light Source and System R&D Center Department of Advanced Optical and Microelectronic EquipmentShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China

Optical coherence elastography(OCE)can quantitatively obtain the viscoelasticity of tissues using rheological models and is widely applied to the clinical diagnosis of ***,commonly used rheological models in OCE do not account for the distinctive dependence of high-frequency storage and loss moduli on frequency in tissues,which results in the rheological models failing to accurately measure the viscoelastic properties of *** this paper,a modified Kelvin-Voigt fractional derivative model is presented based on the power-law behavior of soft tissues and the dependence of high-frequency complex shear modulus on frequency in living *** the rheometer and OCE tests,the modified model can provide the prediction of the power-law relationship between the low-frequency shear viscosity and frequency;compared with the Kelvin-Voigt and Kelvin-Voigt fractional derivative models,the modified model has a higher goodness-of-fit(accuracy>96%)for the high-frequency storage moduli of gelatin ***,the proposed model can reduce the root mean square error of fit by approximately 83%for the high-frequency(1–128 kHz)storage modulus of the polydimethylsiloxane phantoms obtained from publicly available ***,the modified model accurately predicts the mechanical properties of biomimetic materials over a wide frequency range,with the potential to more accurately reflect pathological changes in tissues.

关键词： optical coherence tomography optical coherence elastography viscoelasticity rheological model

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Controlling Preferred Grain Orientation in Vapor-Deposited Metal-Halide Perovskite Thin Films

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Journal of Physical Chemistry C 2025年第23期129卷 10643-10651页

作者： Pettit, Emma C. Hsu, Wan-Ju Garcia-Barriocanal, Javier Srinivasan, Shreyas Kadosh, Tamar Bulović, Vladimir Holmes, Russell J. Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis 55455 MN United States Characterization Facility University of Minnesota Minneapolis 55455 MN United States Department of Chemistry Massachusetts Institute of Technology Cambridge 02142 MA United States Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge 02142 MA United States Department of Electrical and Computer Engineering Massachusetts Institute of Technology Cambridge 02142 MA United States

Metal-halide perovskites are promising semiconductor materials for light-absorber layers in solar cells due to their optimized band gap, defect tolerance, and relative ease of synthesis. In this work, we demonstrate the viability of vapor transport deposition (VTD), a solvent-free processing method, to realize polycrystalline films of both lead iodide (PbI2) and methylammonium lead iodide (MAPbI3) perovskites showing preferential crystallographic orientation. Notable is the difference in perovskite film texturing observed for sequentially and co-deposited VTD films of MAPbI3, as well as the lack of strong preferential orientation in solution-processed MAPbI3 films. While sequential deposition of the perovskite precursors PbI2 and methylammonium iodide (MAI) leads to a MAPbI3 film with a limited preferential grain orientation, co-deposited MAPbI3 films mirror the orientation of excess PbI2 present in the film. The latter is confirmed by the similar dependence of preferential orientation for PbI2 and co-deposited MAPbI3 on underlayer roughness, as well as the emergence of preferential orientation in MAPbI3 only when excess PbI2 is present. Both MAPbI3 and PbI2 films show a strong preferred lattice orientation on smooth substrates, while on rougher substrates, this orientation is disrupted. These results are interpreted as excess PbI2 frustrating the diffusion of MAI in the film, which would otherwise disrupt the preferred orientation, pointing to a notable difference in lattice orientation arising from processing technique and conditions.

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Data-Driven Study of Composition-Dependent Phase Compatibility in Niti Shape Memory Alloys

SSRN

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SSRN 2024年

作者： Zadeh, Sina Hossein Cakirhan, Cem Khatamsaz, Danial Broucek, John Brown, Timothy D. Qian, Xiaoning Karaman, Ibrahim Arroyave, Raymundo Department of Materials Science & Engineering Texas A&M University United States Sandia National Laboratories United States Department of Electrical & Computer Engineering Texas A&M University United States

The martensitic transformation in NiTi-based Shape Memory Alloys (SMAs) provides a basis for shape memory effect and superelasticity, thereby enabling applications requiring solid-state actuation and large recoverable shape changes upon mechanical load cycling. In order to tailor the transformation to a particular application, the compositional dependence of properties in NiTi-based SMAs, such as martensitic transformation temperatures and hysteresis, has been exploited. However, the compositional design space is large and complex, and experimental studies are expensive. In this work, we develop an interpretable piecewise linear regression model that predicts the λ2 parameter, a measure of compatibility between austenite and martensite phases, and an (indirect) factor that is well-correlated with martensitic transformation hysteresis, based on the chemical features derived from the alloy composition. The model is capable of predicting, for the first time, the type of martensitic transformation for a given alloy chemistry. The proposed model is validated by experimental data from the literature as well as in-house measurements. The results show that the model can effectively distinguish between B19 and B19' regions for any given composition in NiTi-based SMAs and accurately estimate the λ2 parameter. Our analysis also reveals that the weighted average of the quotient of the first ionization energy and the Voronoi coordination number is a key compositional characteristic that correlates with the λ2 parameter and thermodynamic responses, including the transformation hysteresis, martensite start temperature, and critical temperature. The work herein demonstrates the potential of data-driven methodologies for understanding and designing NiTi-based SMAs with desired transformation characteristics. © 2024, The Authors. All rights reserved.

关键词： Martensitic transformations

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Thermodynamics of Sodium-Lead Alloys for Negative Electrodes from First-Principles

arXiv

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arXiv 2024年

作者： Lee, Damien K.J. Deng, Zeyu Gautam, Gopalakrishnan Sai Canepa, Pieremanuele Department of Materials Science and Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore Department of Materials Engineering Indian Institute of Science Bangalore560012 India Department of Electrical and Computer Engineering HoustonTX77204 United States Texas Center for Superconductivity University of Houston HoustonTX77204 United States

Metals, such as tin, antimony, and lead (Pb) have garnered renewed attention for their potential use as alloyant-negative electrode materials in sodium (Na)-ion batteries (NIBs). Despite Pb’s toxicity and its high molecular weight, lead is one of the most commonly recycled metals, positioning Pb as a promising candidate for a cost-effective, high-capacity anode material. Understanding the miscibility of Na into Pb is crucial for the development of high-energy density negative electrode materials for NIBs. Using a first-principles multiscale approach, we analyze the thermodynamic properties and estimate the Na-alloying voltage of the Na-Pb system by constructing the compositional phase diagram. In the Pb-Na system, we elucidate the phase boundaries of important phases, such as Pb-rich face-centered cubic and β-NaPb3, thereby improving our understanding of the phase diagram of the Na-Pb alloy. Due to the strong ordering tendencies of the Na-Pb intermetallics (such as NaPb, Na5Pb2, and Na15Pb4), we do not observe any solid-solution behavior at intermediate and high Na concentrations. Copyright © 2024, The Authors. All rights reserved.

关键词： Lead alloys

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Multiplexed Long-Range Electrohydrodynamic Transport and Nano-Optical Trapping with Cascaded Bowtie Photonic Crystal Nanobeams

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Physical Review Letters 2023年第8期130卷 083802-083802页

作者： Sen Yang Joshua A. Allen Chuchuan Hong Kellen P. Arnold Sharon M. Weiss Justus C. Ndukaife Interdisciplinary Materials Science Vanderbilt University Nashville Tennessee 37235 USA Vanderbilt Institute of Nanoscale Science and Engineering Vanderbilt University Nashville Tennessee 37235 USA Department of Electrical and Computer Engineering Vanderbilt University Nashville Tennessee 37235 USA

Photonic crystal cavities with bowtie defects that combine ultrahigh Q and ultralow mode volume are theoretically studied for low-power nanoscale optical trapping. By harnessing the localized heating of the water layer near the bowtie region, combined with an applied alternating current electric field, this system provides long-range electrohydrodynamic transport of particles with average radial velocities of 30 μm/s towards the bowtie region on demand by switching the input wavelength. Once transported to a given bowtie region, synergistic interaction of optical gradient and attractive negative thermophoretic forces stably trap a 10 nm quantum dot in a potential well with a depth of 10 kBT using a mW input power.

关键词： Electrokinetic flows Fluid-particle interactions Microfluidics Nanophotonics Photonic crystals Optical tweezers

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engineering synthetic gauge fields through the coupling phases in cavity magnonics

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Physical Review Applied 2024年第6期21卷 064033-064033页

作者： Alan Gardin Guillaume Bourcin Jeremy Bourhill Vincent Vlaminck Christian Person Christophe Fumeaux Giuseppe C. Tettamanzi Vincent Castel School of Physics Lab-STICC UMR CNRS 6285 ARC Centre of Excellence for Engineered Quantum Systems and ARC Centre of Excellence for Dark Matter Particle Physics Department of Physics School of Electrical Engineering and Computer Science School of Chemical Engineering and Advanced Materials

Cavity magnonics, which studies the interaction of light with magnetic systems in a cavity, is a promising platform for quantum transducers and quantum memories. At microwave frequencies, the coupling between a cavity photon and a magnon, the quasiparticle of a spin-wave excitation, is a consequence of the Zeeman interaction between the cavity’s magnetic field and the magnet’s macroscopic spin. For each photon-magnon interaction, a coupling phase factor exists, and this is often neglected in simple systems; however, in “loop-coupled” systems, where there are at least as many couplings as modes, the coupling phases become relevant for the physics and lead to synthetic gauge fields. We present experimental evidence of the existence of such coupling phases by considering two spheres made of yttrium-iron-garnet and two different re-entrant cavities. We predict numerically the values of the coupling phases, and we find good agreement between the theory and the experimental data. These results show that in cavity magnonics, one can engineer synthetic gauge fields, which can be useful for cavity-mediated coupling and engineering dark-mode physics.

关键词： Magnetic coupling Magnons Optical & microwave phenomena Ferrimagnets Ferromagnetic resonance Gauge symmetries Holstein-Primakoff method Microwave techniques

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