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Analysis of Some Parameters of Synthesized Anodized Aluminum Oxide Matrices 17

Analysis of Some Parameters of Synthesized Anodized Aluminum...

17th IEEE International Conference on Advanced Trends in Radioelectronics, Telecommunications and computer engineering, TCSET 2024

作者： Bukliv, Roxoliana Adamiv, Volodymyr Bordun, Ihor Andrushchak, Nazariy Teslyuk, Ihor Andrushchak, Anatoliy Institute of Chemistry and Chemical Technologies Lviv Polytechnic National University Department of Chemistry and Technology of Inorganic Substances Lviv Ukraine O. G. Vlokh Institute of Physical Opics Ivan Franko National University of Lviv Lviv Ukraine Czestochowa University of Technology Department of Electrical Power Engineering Czestochowa Poland Lviv Polytechnic National University Department of Ecology and Sustainable Environmental Management Lviv Ukraine Lviv Politechnic National University Computer-Aided Design Systems Lviv Ukraine Lviv Polytechnic National University Department of Applied Physics and Nanomaterials Science Lviv Ukraine

ISBN: (纸本)9798331520564

Studies have been conducted on anodized aluminum oxide (AAO) nanomatrices manufactured by SmartMembranes (SM) (Germany) and InRedox (USA). An X-ray fluorescence analyzer determined the quantitative and qualitative composition of AAO matrices. It is shown that the AAO matrices have a large transparency window (250 - 2750 nm) and the dependence of the second harmonic generation (SHG) signal on the pore size. The parameters of the porous structure of the samples were estimated by isothermal processes of nitrogen adsorption/desorption at its boiling point (T = 77 K). © 2024 IEEE.

关键词： Harmonic generation

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Stark Tuning and Resonant Excitation of Hybrid Integrated Telecom Single-Photon Sources

Stark Tuning and Resonant Excitation of Hybrid Integrated Te...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Larocque, Hugo Buyukkaya, Mustafa Atabey Errando-Herranz, Carlos Harper, Samuel Carolan, Jacques Leake, Gerald L. Coleman, Daniel J. Fanto, Michael L. Waks, Edo Englund, Dirk Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Electrical and Computer Engineering Institute for Research in Electronics and Applied Physics University of Maryland College ParkMD20742 United States Institute of Physics University ofMunster Munster48149 Germany State University of New York Polytechnic Institute AlbanyNY12203 United States Air Force Research Laboratory Information Directorate RomeNY13441 United States

We introduce hybrid integrated telecom single-photon sources on a commercial foundry multilayer silicon photonic chip. We show above-band and resonant waveguide-coupled single-photon emission tunable via the DC Stark ... 详细信息

ISBN: (纸本)9781957171258

关键词： Photons

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Multi-pass Imaging Flow Cytometry

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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 1064-1065页

作者： Reynolds, Joshua L. Israel, Yonatan Kasevich, Mark A. Department of Applied Physics Stanford University Stanford CA United States Department of Physics Stanford University Stanford CA United States Faculty of Electrical & Computer Engineering Technion-Israel Institute of Technology Haifa Israel

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Ab initio calculations of erbium crystal field splittings in oxide hosts

arXiv

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arXiv 2025年

作者： Limbu, Yogendra Shi, Yueguang Sink, Joseph Puel, Tharnier O. Paudyal, Durga Flatté, Michael E. Department of Physics and Astronomy University of Iowa Iowa CityIA52242 United States Ames National Laboratory of the US DOE Iowa State University AmesIA50011 United States Department of Electrical and Computer Engineering Iowa State University AmesIA50011 United States Department of Applied Physics Eindhoven University of Technology Eindhoven Netherlands

We present an effective ab initio method to calculate the crystal field coefficients of an erbium (Er3+) ion experiencing different local site symmetries in several wide-band-gap oxides, and then evaluate crystal field splittings of these Er3+ ions for their ground and excited states. The optical transitions between the ground state (Z) and excited state (Y) manifolds of the environmentally shielded 4f states of these Er3+ ions have wavelengths ∼ 1.5 µm and thus have potential applications to quantum communications and quantum memories. These results are in excellent agreement with recent low-temperature measurements, provided the inadequate calculation of the 4f shell screening is adjusted by reducing the radial extent of the 4f wavefunctions by approximately a factor of 2. Copyright © 2025, The Authors. All rights reserved.

关键词： Excited states

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Selective-Area Growth of Gan and Algan Nanowires on N-Polar Gan Templates with 4° Miscut by Plasma-Assisted Molecular Beam Epitaxy

SSRN

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SSRN 2022年

作者： Khan, Kamruzzaman Jian, Zhe Li, Jonathan Sun, Kai Ahmadi, Elaheh Department of Materials Science and Engineering University of Michigan Ann Arbor United States Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor United States Applied Physics Program University of Michigan Ann Arbor United States

In this study, selective area growth (SAG)s of AlGaN/GaN nanowires (NWs) on miscut N-polar GaN templates were studied and compared with that grown on Ga-polar templates using plasma-assisted molecular beam epitaxy (MBE). The SAG of N-polar AlGaN/GaN NWs demonstrated higher growth rate and more growth selectivity than that of Ga-polar AlGaN/GaN NWs. Additionally, lateral growth rate of N-polar NWs was significantly lower than Ga-polar NWs. Compared to the pyramidal shaped top surfaces of Ga-polar NWs, the N-polar GaN NWs had flat head top surfaces. The combination of higher growth selectivity, larger growth window, negligible lateral growth, and flat head, makes N-polar (Al,Ga)N NWs attractive for a variety of applications including UV LEDs and detectors as well as quantum sensing. © 2022, The Authors. All rights reserved.

关键词： Aluminum gallium nitride

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Exemplar-Based Radio Map Reconstruction of Missing Areas Using Propagation Priority

Exemplar-Based Radio Map Reconstruction of Missing Areas Usi...

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GLOBECOM 2022 - 2022 IEEE Global Communications Conference

作者： Songyang Zhang Tianhang Yu Jonathan Tivald Brian Choi Feng Ouyang Zhi Ding Department of Electrical and Computer Engineering University of California Davis CA USA Applied Physics Laboratory Johns Hopkins University Laurel Maryland USA

ISBN: (纸本)9781665435413

Radio map describes network coverage and is a practically important tool for network planning in modern wireless systems. Generally, radio strength measurements are collected to construct fine-resolution radio maps for analysis. However, certain protected areas are not accessible for measurement due to physical constraints and security considerations, leading to blanked spaces on a radio map. Non-uniformly spaced measurement and uneven observation resolution make it more difficult for radio map estimation and spectrum planning in protected areas. This work explores the distribution of radio spectrum strengths and proposes an exemplar-based approach to reconstruct missing areas on a radio map. Instead of taking generic image processing approaches, we leverage radio propagation models to determine directions of region filling and develop two different schemes to estimate the missing radio signal power. Our test results based on high-fidelity simulation demonstrate efficacy of the proposed methods for radio map reconstruction.

关键词： Wireless communication Image resolution Area measurement Estimation Radio propagation Filling Planning

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Ab initio calculations of erbium crystal field splittings in oxide hosts: role of the 4fradial wave function

arXiv

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arXiv 2025年

We expand here our description of a newly developed simple and effective ab initio method of calculating crystal field coefficients (CFCs) of rare-earth atoms in insulating hosts, focusing on Er in wide band gap oxide hosts MgO, ZnO, TiO2, CaWO4, and PbWO4, which exemplify different local site symmetries. These hybrid functional calculations, which incorporate a portion of exact exchange from Hartree-Fock theory, reproduce the experimentally identified insulating band gaps of these oxides. The negative values of cohesive and formation energies confirm the structural and chemical stability of these oxides, whereas the defect formation energies indicate that Er doped ZnO, CaWO4, and PbWO4 are easier to form compared to Er doped MgO and TiO2. Er doped in these oxide hosts exhibits a spin magnetic moment of ∼ 3 μB confirming the 3+ valance state. The CFCs of these hosted Er are determined from charge densities and potentials obtained from nonspin- polarized calculations, involving a 4f core approximation. These CFCs are subsequently used to solve an effective Hamiltonian and generate the crystal field splitting of Er 4f. These calculated Er 4f energy levels are in good agreement with available experiments. Copyright © 2025, The Authors. All rights reserved.

关键词： Energy gap

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引用

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Basani, Jasvith Raj Vadlamani, Sri Krishna Bandyopadhyay, Saumil Englund, Dirk R. Hamerly, Ryan Department of Electrical and Computer Engineering Institute for Research in Electronics and Applied Physics Joint Quantum Institute University of Maryland College ParkMD20742 United States Research Laboratory of Electronics Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States NTT Research Inc. PHI Laboratories 940 Stewart Drive SunnyvaleCA94085 United States

We propose a novel architecture for multiport interferometers based on the Sine-Cosine fractal decomposition of unitary matrices. Our design is modular, resilient to hardware imperfections and enables systematically t... 详细信息

ISBN: (纸本)9781957171258

关键词： Fractals

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Loss tangent fluctuations due to two-level systems in superconducting microwave resonators

arXiv

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arXiv 2024年

作者： Vallières, André Russell, Megan E. You, Xinyuan Garcia-Wetten, David A. Goronzy, Dominic P. Walker, Mitchell J. Bedzyk, Michael J. Hersam, Mark C. Romanenko, Alexander Lu, Yao Grassellino, Anna Koch, Jens McRae, Corey Rae H. Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Fermi National Accelerator Laboratory BataviaIL60510 United States Department of Physics and Astronomy Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Chemistry Northwestern University EvanstonIL60208 United States Department of Electrical and Computer Engineering Northwestern University EvanstonIL60208 United States Center for Applied Physics and Superconducting Technologies Northwestern University EvanstonIL60208 United States Electrical Computing and Energy Engineering Department University of Colorado BoulderCO80309 United States Department of Physics University of Colorado BoulderCO80309 United States National Institute of Standards and Technology BoulderCO80305 United States

Superconducting microwave resonators are critical to quantum computing and sensing technologies. Additionally, they are common proxies for superconducting qubits when determining the effects of performance-limiting loss mechanisms such as from two-level systems (TLS). The extraction of these loss mechanisms is often performed by measuring the internal quality factor Qi as a function of power or temperature. In this work, we investigate large temporal fluctuations of Qi at low powers over periods of 12 to 16 hours (relative standard deviation σQi/Qi = 13%). These fluctuations are ubiquitous across multiple resonators, chips and cooldowns. We are able to attribute these fluctuations to variations in the TLS loss tangent due to two main indicators. First, measured fluctuations decrease as power and temperature increase. Second, for interleaved measurements, we observe correlations between low- and medium-power Qi fluctuations and an absence of correlations with high-power fluctuations. Agreement with the TLS loss tangent mean is obtained by performing measurements over a time span of a few hours. We hypothesize that, in addition to decoherence due to coupling to individual near-resonant TLS, superconducting qubits are affected by these observed TLS loss tangent fluctuations. © 2024, CC BY.

关键词： Qubits

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Optical phase-sensing for coherent beam combining via CMA-ES algorithm

Optical phase-sensing for coherent beam combining via CMA-ES...

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Optica Sensing Congress 2023, AIS, FTS, HISE, Sensors, ES 2023 - Part of Optical Sensors and Sensing Congress 2023

作者： Yeo, Minsu Kim, Hansol Kim, Byungho Jeong, Yoonchan SNU Laser Laboratory Department of Electrical and Computer Engineering Seoul National University Seoul08826 Korea Republic of Inter-University Semiconductor Research Center Seoul National University Seoul08826 Korea Republic of Institute of Applied Physics Seoul National University Seoul08826 Korea Republic of SNU BK21 four Seoul National University Seoul08826 Korea Republic of

In this paper, a CMA-ES algorithm-based phase-sensing method is proposed and investigated. Thanks to the probability-based operational property of optimization conducted by the covariance matrix, the proposed method c... 详细信息

ISBN: (纸本)9781957171241

关键词： Covariance matrix

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