A5019520867- Plasmonic and Surface Plasmon Research
- Physics of Superconductivity and Magnetism
- Electromagnetic Simulation and Numerical Methods
- Metamaterials and Metasurfaces Applications
- Electromagnetic Scattering and Analysis
- Microwave Engineering and Waveguides
- Advanced Condensed Matter Physics
- Gas Dynamics and Kinetic Theory
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Computational Fluid Dynamics and Aerodynamics
- Terahertz technology and applications
- Quantum Information and Cryptography
- Magnetic properties of thin films
- Advanced Surface Polishing Techniques
- Quantum Computing Algorithms and Architecture
- Advanced Machining and Optimization Techniques
- Superconducting Materials and Applications
- Orbital Angular Momentum in Optics
- Fluid Dynamics and Turbulent Flows
- Lattice Boltzmann Simulation Studies
- Quantum Mechanics and Applications
- Magnetic and transport properties of perovskites and related materials
- Advanced Chemical Physics Studies
- Geophysical Methods and Applications
Anhui University
2016-2025
Harbin Engineering University
2021-2024
China Aerodynamics Research and Development Center
2013-2024
Anhui Polytechnic University
2020-2024
Gaochun People's Hospital
2024
Southeast University
2022-2023
Shanghai Normal University
2023
Xidian University
2015-2022
Iowa State University
1985-2019
Ames National Laboratory
1985-2019
A new method has been used to produce uniaxially aligned small single crystals of ${\mathrm{Y}}_{1}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$. The superconducting critical current deduced from magnetization data is strongly field dependent and highly anisotropic. In the basal plane at $T=4.2$ K we estimate that zero in excess ${10}^{7}$ A/${\mathrm{cm}}^{2}$.
In terahertz (THz) technologies, generation and manipulation of THz waves are two key processes usually implemented by different device modules. Integrating into a single compact will advance the applications technologies in various fields. Here, we demonstrate hybrid nonlinear plasmonic metasurface incorporating an epsilon-near-zero (ENZ) indium tin oxide (ITO) layer to seamlessly combine efficient across wide frequency band. The coupling between resonance ENZ mode ITO thin film enhances...
In high-${T}_{c}$ superconductors there exists a broad field domain, in which the reversible magnetization $\mathbf{M}$ is linear logarithm of applied ${H}_{a}$. The dependence $\mathbf{M}(\mathrm{ln}{H}_{a})$ obtained taking strong uniaxial anisotropy into account. It shown, that for an arbitrary orientation single crystal with respect to ${\mathbf{H}}_{a}$ vector has component normal comparable usually measured parallel ${\mathbf{H}}_{a}$. A procedure suggested extracting value penetration...
We have studied the field at which superconductivity nucleates in grain-aligned samples of ${\mathrm{Y}}_{1}$${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ very close to transition temperature ${T}_{c}$. For parallel c axis and for temperatures within 2 K ${T}_{c}$, nucleation is found vary as (1-T/${T}_{c}$${)}^{1/2}$. The data suggest that localized near twin boundaries may exist .AE
Abstract Generation and manipulation of terahertz (THz) waves are vital importance for advancing THz technology. Nonlinear metasurfaces allow effective integration both processes into a single compact device. However, such existing devices commonly rely on utilizing meta‐atom, which has fixed generation properties thus limits the range achievable functionalities. Here, it is demonstrate how coupling between different meta‐atoms within unit‐cell can be used as degree freedom controlling...
Applications of metallic metamaterials have generated significant interest in recent years.Electromagnetic behavior the optical range is usually characterized by a local-linear response.In this article, we develop finite-difference time-domain (FDTD) solution hydrodynamic model that describes free electron gas metals.Extending beyond response, enables numerical investigation nonlocal and nonlinear interactions between electromagnetic waves metamaterials.By explicitly imposing current...
In this letter, a 3-D subgridding finite-difference time-domain (FDTD) approach is proposed. The calculation domain divided into regions with dense meshes and coarse meshes. By applying the proposed technique to grid regions, memory computation resources can be significantly reduced. Furthermore, Courant–Friedrich–Levy (CFL) limitation of mesh broken by one-step leapfrog alternately direction-implicit (ADI)-FDTD. Coarse adopt uniform time step, which limited only standard FDTD CFL condition...
This paper presents an investigation into the nonlinear dynamic behaviors of floating raft isolation system coupled with quasi-zero-stiffness isolators subject to multiple disturbance sources. First, coupling effects between excitation source and are considered. Also, model under excitations its motion equation deduced, then responses mainly investigated by using techniques time history diagram, spectrum phase diagram Poincaré map, bifurcation diagram. Finally, bifurcations mechanical...
The nonlinear metamaterials have been shown to provide properties with high conversion efficiency and in a myriad of light manipulation.Here we study terahertz generation from metasurface consisting single layer nanoscale split-ring resonator array.The due optical rectification by the second-order nonlinearity is investigated time-domain implementation hydrodynamic model for electron dynamics metal.The results show that enables us generate broadband radiation free quasi-phasematching...
Plasmonic metamaterials and metasurfaces offer new opportunities in developing high performance terahertz emitters detectors beyond the limitations of conventional nonlinear materials. However, simple meta-atoms for second-order applications encounter fundamental trade-offs necessary symmetry breaking local-field enhancement due to radiation damping that is inherent operating resonant mode cannot be controlled separately. Here we present a novel concept eliminates this restriction...
Abstract The DSMC modeling is developed to simulate three-dimensional (3D) rarefied ionization flows and numerically forecast the communication blackout around spacecraft during hypervelocity reentry. A new weighting factor scheme for rare species introduced, whose key point modify corresponding chemical reaction coefficients involving electrons, meanwhile reproduce in resultants preserve/delete common reactants according factors. resulting method highly efficient simulating weakly...
YBa2Cu3O7−x compounds were extruded into long wires with the diameter of 1 mm after sintering. The sintered subsequently zone melted to develop a highly textured microstructure. Magnetization experiments at 77 K indicated Jc value 1×105 A/cm2 T. Transport measurements showed greatly enhanced field dependence critical current density. Transmission electron microscopy revealed an important grain-boundary feature which eliminated weak-link behavior. Large amounts dislocations have also been...
A quantified model-competition (QMC) mechanism for multiscale flows is extracted from the integral (analytical) solution of Boltzmann-BGK model equation. In QMC mechanism, weight rarefied and continuum (aerodynamic hydrodynamic) are quantified. Then, a simplified unified wave-particle method (SUWP) constructed based on mechanism. SUWP, stochastic particle Navier-Stokes combined together. Their weights determined by quantitatively in every discrete cell computational domain. The validity...
A self-consistent approach is proposed to simulate a coupled system of quantum dots (QDs) and metallic metamaterials. Using four-level atomic system, an artificial source introduced the spontaneous emission process in QDs. We numerically show that metamaterials can lead multifold enhancement spectral narrowing photoluminescence from These results are consistent with recent experimental studies. The method represents essential step for developing understanding metamaterial gain medium inclusions.
A uniform grain-oriented microstructure was developed in 50-mm-long bar samples of bulk YBa2Cu3Ox prepared by a partial melt growth process. In sharp contrast to previous reports, the textured products contained only small amounts second phases. The were dense and nearly free porosity. Transport measurements showed that could carry critical current density greater than 4.4×104 A/cm2 at 77 K 1.8 T. possible effects processing parameters on superconducting properties tested materials are discussed.