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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Li, Zhichao Prasad, Ciril S. Wang, Xielin Naik, Gururaj V. Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States

Plasmonic sensors exhibit high sensitivity due to enhanced local fields. But, their detectivity is poor because of their poor Q-factors. Using a plasmonic BIC, we experimentally demonstrate enhanced Q-factors in a pla... 详细信息

ISBN: (纸本)9781957171258

关键词： Q factor measurement

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Tuning spinaron and Kondo resonances via quantum confinement

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Physical Review B 2024年第19期109卷 195415-195415页

作者： Markus Aapro Abraham Kipnis Jose L. Lado Shawulienu Kezilebieke Peter Liljeroth Department of Applied Physics Aalto University FI-00076 Aalto Finland Department of Neuroscience and Biomedical Engineering Aalto University FI-00076 Aalto Finland Department of Physics Department of Chemistry and Nanoscience Center University of Jyväskylä FI-40014 Jyväskylä Finland

Controlling zero-bias anomalies in magnetic atoms provides a promising strategy to engineer tunable quantum many-body excitations. Here we show how two different quantum impurities featuring spinaron and Kondo excitations can be controlled via quantum confinement engineering by using circular quantum corrals on a Ag(111) surface. In corrals built from both Ag and Co adatoms, the width of the zero-bias anomaly in the central Co adatom oscillates as a function of corral radius with a period of half of the Ag(111) surface state wavelength. Parameters extracted for Co/Ag(111) show only small differences in the extracted spinaron zero-bias anomaly between corral walls built from Ag or Co adatoms. In quantum corrals occupied by metal-free phthalocyanine, a S=1/2 Kondo system, we observe notable changes in the zero-bias anomaly line shape as a function of corral radius. Our results offer insight into many-body Kondo and spinaron resonances in which the electronic density is controlled by confinement engineering.

关键词： Exchange interaction Kondo effect Local density of states Surface states Quantum dots Scanning tunneling microscopy Scanning tunneling spectroscopy

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Characterization of Fluoride-added Hydroxyapatite Derived from Eggshells for Dental Application 15

Characterization of Fluoride-added Hydroxyapatite Derived fr...

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15th biomedical engineering International Conference, BMEiCON 2023

作者： Uthayaphamornwat, Vilasinee Khantachawana, Anak Kitiwan, Mettaya Srirussamee, Kasama Tunthawiroon, Phacharaphon School of Engineering Department of Biomedical Engineering Bangkok10520 Thailand Faculty of Engineering Department of Mechanical Engineering Bangkok10140 Thailand Biological Engineering Program Faculty of Engineering Bangkok10140 Thailand School of Science Department of Physics Bangkok10520 Thailand Devices and Systems for Energy and Environment Research Unit School of Science Bangkok10520 Thailand School of Engineering Department of Industrial Engineering Bangkok10520 Thailand

ISBN: (纸本)9798350345247

Hydroxyapatite (HA) is one of the potential biomaterials used for treating dental defects. It can be incorporated with fluoride to enhance its anti-caries properties, though other properties could be dependent on processing technique. Hence, this study aims to characterize the influence of sintering on the properties of fluoride-added HA derived from eggshells. FTIR and XRD techniques are used to characterize the chemical and crystal structures of the samples, whilst dissolution test is carried out to characterize material degradation in the acidic environment. The results show that sintering increased the crystallinity in both HA and fluoride-add HA (F-HA) samples, which corresponds with the enhanced stability during the dissolution test. Moreover, it is also found that the addition of fluoride could further stabilize the material structure, though the impurities found in all the samples still need to be minimized. These findings suggest that sintering and fluoride addition could potentially enhance anti-caries properties of eggshell-derived HA, which could be beneficial for dental application in future subject to further process optimization and analysis. © 2023 IEEE.

关键词： Hydroxyapatite

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One-Way Quantum Repeater with Rare-Earth-Ions Doped in Solids

arXiv

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arXiv 2024年

作者： Lei, Yisheng Department of Electrical and Computer Engineering and Applied Physics Program Northwestern University EvanstonIL60208 United States

Quantum repeaters are proposed to overcome exponential photon loss over distance in fibers. One-way quantum repeaters eliminate the need for two-way classical communications, which can potentially outperform quantum memory based quantum repeaters. I propose that rare-earth-ions doped in solids and coupled with nano-cavity can be used to generate photonic cluster state efficiently, which serve as good platforms for one-way quantum repeater nodes. In addition, I propose a multiplexed scheme of photonic tree cluster state generation with multiple quantum emitters. With less than 100 quantum emitters, secret key rates can reach the order of MHz over a few thousand kilometers. This proposal is especially useful for generating large scale photonic cluster state, which is essential for correcting operational errors during processing in quantum repeater nodes. © 2024, CC BY.

关键词： Metal ions

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Deterministic Quantum Repeater with Single Atoms in Cavities

arXiv

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arXiv 2024年

作者： Lei, Yisheng Department of Electrical and Computer Engineering and Applied Physics Program Northwestern University EvanstonIL60208 United States

Efficient quantum repeaters are needed to combat photon losses in fibers in future quantum networks. Single atom coupled with photonic cavity offer a great platform for photon-atom gate. Here I propose a quantum repeater scheme with deterministic entanglement generation and entanglement swapping based on photon-atom gates. It can be implemented with various types of atomic systems and require much less experimental complexity compared with other repeater protocols. With current available experimental techniques and reasonable improvements, high entanglement distribution rates can be achieved. A multiplexing configuration of 5-10 single atoms in cavities, secret key rates in order of 100s Hz to kHz can be achieved for communication distance of 1000km, and a few Hz to 10s Hz can be achieved for communication distance of 10000km with longer atomic coherence time and lower photon-atom gate error rate. This proposal paves the way to demonstrate efficient entanglement distribution with quantum repeaters in near future. © 2024, CC BY.

关键词： Atoms

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Endotaxial Polytype engineering: Enhancement of Incommensurate Charge Density Waves in TaS2

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1646-1647页

作者： Sung, Suk Hyun Kezer, Pat Agarwal, Nishkarsh Goh, Yin Min Schnitzer, Noah Baggari, Ismail El Sun, Kai Kourkoutis, Lena F. Heron, John T. Hovden, Robert Department of Materials Science and Engineering University of Michigan Ann Arbor MI United States Department of Physics University of Michigan Ann Arbor MI United States Department of Materials Science and Engineering Cornell University Ithaca NY United States Rowland Institute at Harvard University Cambridge MA United States Kavli Institute at Cornell for Nanoscale Science Ithaca NY United States School of Applied and Engineering Physics Cornell University Ithaca NY United States Applied Physics Program University of Michigan Ann Arbor MI United States

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DeepSeeColor: Realtime Adaptive Color Correction for Autonomous Underwater Vehicles via Deep Learning Methods

arXiv

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arXiv 2023年

作者： Jamieson, Stewart How, Jonathan P. Girdhar, Yogesh The MIT-WHOI Joint Program in Oceanography/Applied Ocean Science and Engineering United States Applied Ocean Physics and Engineering Department

Successful applications of complex vision-based behaviours underwater have lagged behind progress in terrestrial and aerial domains. This is largely due to the degraded image quality resulting from the physical phenomena involved in underwater image formation. Spectrally-selective light attenuation drains some colors from underwater images while backscattering adds others, making it challenging to perform vision-based tasks underwater. State-of-the-art methods for underwater color correction optimize the parameters of image formation models to restore the full spectrum of color to underwater imagery. However, these methods have high computational complexity that is unfavourable for realtime use by autonomous underwater vehicles (AUVs), as a result of having been primarily designed for offline color correction. Here, we present DeepSeeColor, a novel algorithm that combines a state-of-the-art underwater image formation model with the computational efficiency of deep learning frameworks. In our experiments, we show that DeepSeeColor offers comparable performance to the popular "Sea-Thru" algorithm [1] while being able to rapidly process images at up to 60Hz, thus making it suitable for use onboard AUVs as a preprocessing step to enable more robust vision-based behaviours. Copyright © 2023, The Authors. All rights reserved.

关键词： Autonomous underwater vehicles

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Annular Dark Field Imaging with Variable Angle for Improving STEM Tomography of Biological Samples

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 945-947页

作者： Li, Wing Shun Roth, Eric Bleher, Reiner Backman, Vadim Dravid, Vinayak P. Applied Physics Program Northwestern University Evanston IL United States Department of Materials Sciences and Engineering Northwestern University Evanston IL United States Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center Northwestern University Evanston IL United States Department of Biomedical Engineering Northwestern University Evanston IL United States International Institute of Nanotechnology Northwestern University Evanston IL United States

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Fluorescent Carbon Dots Illuminate Hydrogen Peroxide Detection: A Promising Approach

Fluorescent Carbon Dots Illuminate Hydrogen Peroxide Detecti...

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BioCAS Workshop, IEEE Colombian

作者： Jessica D. Sánchez Fonseca Nicolas J. Bonilla Fajardo Natalia Vargas Perdomo Oscar Julian Perdomo Charry Álvaro D. Orjuela-Cañón Emma Martín Rodriguez Diana C. Rodriguez Burbano Biomedical Engineering Program School of Medicine and Health Sciences Universidad del Rosario Bogotá Colombia Biomedical Engineering Program Colombian School of Engineering Universidad del Rosario Bogotá Colombia Department of Applied Physics Universidad Autónoma de Madrid Madrid Spain

Hydrogen peroxide ($H_{2}O_{2}$) is an oxidant widely used in industrial and biomedical applications that requires a sensitive and selective quantification method. Despite being one of the most used methods for detecting this oxidant, enzyme-based reactions still exhibit low-cost efficiency and pose high environmental hazards. Optical biosensors have emerged as an attractive alternative, offering potential advantages such as rapid response time and ease of operation. Carbon dots (CDs) are a type of carbon-based nanoparticles that are particularly appealing for this purpose because of their low-cost synthesis procedures and favorable chemical and optical properties. In this study, fluorescent CDs were synthesized via a microwave-assisted method using urea, L-histidine, and citric acid as precursors. The optical properties of the CDs were characterized using UV-Vis and fluorescence spectroscopy. The CDs exhibited a fluorescence sensing range between 1 mM to 50 mM, with a limit detection (LOD) for $H_{2}O_{2}$ of 0.1 mM. The selectivity of the CDs was tested in the presence of various interferents, and the results confirmed their potential for further applications, particularly in metabolite quantification and biological processes. Overall, the low-cost synthesis procedure and favorable properties of the CDs make them a promising candidate for $H_{2}O_{2}$ detection and other biosensing applications.

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Muon-induced collisional flavor instability in core-collapse supernova

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Physical Review D 2024年第4期110卷 043039页

作者： Jiabao Liu Hiroki Nagakura Ryuichiro Akaho Akira Ito Masamichi Zaizen Shun Furusawa Shoichi Yamada Department of Physics and Applied Physics School of Advanced Science & Engineering Division of Science Faculty of Science and Engineering College of Science and Engineering Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) RIKEN Wako Saitama 351-0198 Japan Department of Physics School of Advanced Science & Engineering Research Institute for Science and Engineering

Neutrinos are known to undergo flavor conversion among their three flavors. In the theoretical modeling of core-collapse supernova, there has been a great deal of attention to recent discoveries of a new type of neutrino flavor conversions, namely collisional flavor instability (CFI), in which the instability is induced by the flavor-dependent decoherence due to the disparity of neutrino-matter interactions among flavors. In this paper, we study how the appearance of on-shell muons and associated neutrino-matter interactions can impact CFIs based on linear stability analysis of flavor conversions. Some striking results emerge from the present study. First, we analytically show that breaking beta and pair equilibrium is a necessary condition to trigger CFIs. This also indicates that CFIs with on-shell muons could appear in eτ and μτ neutrino mixing sectors in very high-density region (≳1013 g/cm3), exhibiting a possibility of large impacts of CFIs on core-collapse supernova. Second, resonancelike CFIs, having a much higher growth rate than normal CFIs, can be triggered by muons. The resonance point of CFIs is different between eτ and μτ sectors; the former (latter) occurs at μe(μ)=μn−μp, where μi denotes the chemical potential of i constitute (n and p represent neutrons and protons, respectively). Our result suggests that the nonlinear evolution of CFI with on-shell muons would induce flavor conversions with the complex interplay among all three different neutrino-mixing sectors.

关键词： Neutrino mixing Neutrino oscillations Novae & supernovae Neutrinos

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