bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental melting curve of zirconium metal to 37 GPa
Authors: Pigott Jeffrey S , Velisavljevic Nenad , Moss Eric K , Draganic Nikola , Jacobsen Matthew K , Meng Yue , Hrubiak Rostislav , Sturtevant Blake T 
Published: April 2020

Abstract
In this report, we present results of high-pressure experiments probing the melt line of zirconium (Zr) up to 37 GPa. This investigation has determined that temperature versus laser power curves provide an accurate method to determine melt temperatures. When this information is combined with the onset of diffuse scattering, which is associated with the melt process, we demonstrate the ability to accurately determine the melt boundary. This presents a reliable method for rapid determination of melt boundary and agrees well with other established techniques for such measurements, as reported in previous works on Zr.
Fabrication and electrical transport characterization of high quality underdoped YBa2Cu3O7-δ nanowires
Authors: Andersson Eric , Arpaia Riccardo , Trabaldo Edoardo , Bauch Thilo , Lombardi Floriana 
Published: April 2020

Abstract
We present the fabrication and electrical transport characterization of underdoped YBa2Cu3O7-δ nanowires. The nanowires have been realized without any protective capping layer and they show transport properties similar to those of the parent thin film, demonstrating that they have not been damaged by the nanopatterning. The current-voltage characteristics of the underdoped nanowires show large hysteretic voltage switching at the critical current, in contrast to the flux-flow like characteristics of optimally doped nanostructures, indicating the formation of a self-stabilizing hot spot. These results open up new possibilities for using the underdoped nanowires as single photon detectors and for exploring the underdoped side of the YBa2Cu3O7-δ phase diagram at the nanoscale.
Preparation of inverse photonic crystals by ETPTA photopolymerization method and their optical properties
Authors: Ashurov M S , Bakhia T , Saidzhonov B M , Klimonsky S O 
Published: April 2020

Abstract
Inverse photonic crystal films were prepared by photopolymerization of ethoxylate trimethylolpropane triacrylate (ETPTA) using opal-type templates. Their high quality was proved by investigations of structural and optical properties. The unexpectedly high refractive index, nETPTA ≈ 1.67, of polymerized ETPTA was obtained from a numerical approximation of the spectral positions of the reflectance peak of the films at different incidence angles. Fabricated samples were tested as sensors for water-ethanol mixtures, and a monotonous increase in the stop band shift with an increase in ethanol concentration was established.
Magnetic field driven light control by hybrid magneto-optical metasurfaces
Authors: Barsukova Maria G , Musorin Alexander I , Shorokhov Alexander S , Fedyanin Andrey A 
Published: April 2020

Abstract
Demonstration of magneto-optical effects enhancement in hybrid Ni/Si metasurfaces is reported. Our results show that the polarization plane rotation angle reaches the considerable value with a change of a sign in a very narrow spectral range in the vicinity of the optical magnetic dipole Mie - type resonance. The specific Faraday rotation is 160 degrees/μm, which is an outstanding effect for an ultra-thin magnetic material with a thickness of only 5 nm as used in this work. These results could be used for the creation of active nonreciprocal photonic nanostructures and metasurfaces.
Optically-driven Rotation of Perfectly Absorbing Nanoparticles
Authors: Canós Valero A. , Shalin A.S. 
Published: April 2020

Abstract
Optical manipulation of small scatterers assisted with auxiliary nanostructures is a very promising and already proven concept. In this work, we investigate an interesting application of angular momentum transfer in light scattering by dielectric nanoparticles. We show that, when illuminated by a circularly polarized plane wave, the scattered Poynting vector from a homogeneous dielectric cube presents a divergence-free component. Such Poynting vector distribution induces rotational motion via angular momentum transfer to any strong absorbing particle in the vicinity of the scatterer. We illustrate this effect in the case perfectly absorbing dipolar nanoparticles. The proposed design is the first step towards an efficient all-dielectric mixing scheme for micro-fluidics applications.
Ab-initio calculation of electronic properties of all-inorganic Pb-based mixed-halide perovskites
Authors: Cherotchenko E. D. , Liashenko T. G. , Agapev K. B. , Vrubel I. I. , Polozkov R. G. , Shelykh Ivan A. 
Published: April 2020

Abstract
Mixed lead-halide perovskite films have recently become a subject of intensive study in the nanophotonic community due to their unique optical properties. In this work we present theoretical investigations of the electronic band structure of full inorganic mixed-halide perovskites in a continuous range of chemical compositions. We demonstrate that in the orthorhombic geometry independently on the particular halogen concentrations the optical band gap remains direct, varying in the absolute value, with the fundamental absorption edge corresponding to the high symmetry point Γ of the band structure. This tunability of the optical band gap in inorganic mixed-halide perovskites is highly promising and has various possible nanophotonic and photovoltaic applications.
Modal analysis of Mie resonators: Pole-expansion of scattering operators
Authors: Colom Rémi , Mcphedran Ross , Stout Brian , Bonod Nicolas 
Published: April 2020

Abstract
Most of the resonant photonic structures behave like open cavities for light where light is trapped for some time before leaking or being absorbed. Their modes are called quasi-normal modes and are associated with complex eigenfrequencies

ω
n

=

ω
n
′

+
i

ω
n
″

,

ω
n
″

characterizing the rate at which the energy leaks from the structure. As a consequence, one can show that the fields of these modes diverge far away from the scatterer. This is problematic when one attempts to develop a theoretical description of the resonant interaction between light and resonant photonic stuctures in terms of their quasi-normal modes. Moreover, the existence or not of a non-resonant term in addition to these resonant contributions is still an open problem. Here, we address these two problems by deriving pole-expansions of the scattering operators of resonant optical structures. We evince the existence of a non-resonant term and we solve the problem of the divergence by studying the scattered field in the time domain and by using the causality principle. The quasi-normal mode expansion that we obtain will be of a great use to study light-matter interactions since it allows to determine the optical response of a photonic resonator both in the time and frequency domain.
Metasurfaces homogenization technique based on the computation of the average value of the contravariant tensors elements
Authors: Edee Kofi 
Published: April 2020

Abstract
The purpose of this paper is to present a 2D metasurfaces homogenization based on the computation of the average value of the contravariant tensors elements. A simple semi-analytical model for the comprehension of the extraordinary optical transmission (EOT) through a 2D array of periodic subwavelength metasurface is analyzed through the proposed method. In this single mode model, the mono layer of the metasurface film is considered as homogeneous medium. Therefore, the electromagnetic response of this structure to a plane wave excitation is equivalent to that of a slab with homogeneous equivalent properties. In a coordinates system where the coordinate curves xj
coincide with the physical discontinuity of the material, the covariant formalism involving contravariant components of density flux and covariant components of the electromagnetic field, allows to efficiently handle the continuity properties of the electromagnetic field. By averaging all these quantities involving local fields over the periods of the unit cell, and assuming that, these macroscopic fields and densities satisfy a constitutive relationship, the electromagnetic parameters such as averaged permittivity and permeability can be defined.
Wave transmission through a layered piezoelectric/elastic phononic crystal with capacitors
Authors: Fomenko Sergey I. , Golub Mikhail V. , Zhang Chuanzeng 
Published: April 2020

Abstract
In this study, elastic wave propagation through a layered phononic crystal made of finite number of unit-cells composed of four elastic/piezoelectric layers and surface electrodes connected by an electrical circuit with a capacitor is considered. The numerical investigation based on the transfer matrix method of the influence of the condenser capacitance on the stop-bands is provided. Some critical values of capacitance providing stop-band transformation into pass-bands are revealed.
Synthesis of nanocrystalline bismuth ferrite by cation-exchange method
Authors: Kalganov Dmitry A , Gryaznova Mariya S. , Bychkov Igor V , Belaya Elena A. 
Published: April 2020

Abstract
In the present work, cation-exchange synthesis on a previously synthesized organic matrix was used to obtain nanodispersed bismuth ferrite powder. The phase composition of the samples was investigated by X-ray diffraction. Using scanning electron microscopy images of powder particles were obtained, their morphology and size were studied. The ferromagnetic resonance in millimeter microwave frequencies at room temperature for multiferroic BiFeO3 nanopowder sample with an appropriate sample-thickness about 1 mm. was observed.
Optical binding near hyperbolic metamaterial substrates
Authors: Kostina N A , Kislov D A , Ginzburg P , Shalin A S 
Published: April 2020

Abstract
We study optical binding of two dielectric nanoparticles near a boundary between air and hyperbolic metamaterial. Three kinds of modes contribution are analyzed and it is shown, that evanescent waves allow formation of stable bound dimer due to hyperbolic metamaterial modes. We have found the most profitable parameters of hyperbolic metamaterial substrate, providing enhancement of the optical binding effect.
Control of the RF magnetic field pattern by tunable metasurface in 1.5 T MRI
Authors: Kretov E. , Shchelokova A. , Slobozhanyuk A. 
Published: April 2020

Abstract
A metasurface with a unit cell in the form of a half-wave dipole can be used as a base for the creation of wireless coils for magnetic resonance imaging (MRI). In a real structure based on a metasurface concept, the number of elements is always limited. Therefore, some elements at the edges become weaker coupled and radiofrequency (RF) magnetic field pattern becomes distorted. In this paper, we investigate metasurface-based structure with added non-uniform electrical capacitance at the ends of the resonant unit cells. We show that such a structure can be easily adjusted to work within the frequency range of the clinical 1.5 T MRI machine. Also, we demonstrate that by adding of non-uniform edge capacitances at the resonant elements, it is possible to control the RF magnetic field pattern above the structure.
High order discontinuous Galerkin methods for time-domain and frequency-domain nanophotonics
Authors: Chaumont-Frelet T. , Descombes S. , Gobé A. , Moghtader Mostafa Javadzadeh , Lanteri S. , Scheid C. , Schmitt N. , Viquerat J. 
Published: April 2020

Abstract
The discontinuous Galerkin (DG) method is a general numerical modeling approach that has been extensively studied in the last 20 years for the solution of many systems of partial differential equations in physics. Its development for the numerical treatment of the system of Maxwell equations was initiated by the applied mathematics community in the early 2000s. It is now a very popular method for time-domain electromagnetics, which is increasingly used and further developed by the applied physics and electrical engineering communities. More recently, a specific variant of DG, referred to as hybridized DG (or HDG), has been proposed for frequency-domain electromagnetics. DG methods possess nice features that make them particularly attractive for dealing with heterogeneous media and irregularly shaped or curved geometries, and more generally with multiscale problems. Not surprisingly, the method has also been adopted by researchers in the nano-optics field. In this paper, we report on our recent efforts for extending the capabilities of this family of methods for the numerical modeling of nanoscale light-matter interactions.
Acousto-optical deflector for non-mechanical manipulating using optical tweezers
Authors: Machikhin A S , Pichugina Y V , Kozlov A B , Batshev V I , Pozhar V E , Nosov P A 
Published: April 2020

Abstract
Optical tweezers are widely used in various fields of science and technology, such as biophysics, cytology and solid-state physics. Most of the existing optical tweezers use mirror or mirror-lens systems to manipulate the position of the trap. Such systems require precise alignment and do not allow the trap to be moved quickly from one arbitrary point to another due to the inertia of the mirror and lenses. We discuss acousto-optic scanning characterized by high precision and repetition rate for manipulating micro-objects using optical tweezers. Bragg diffraction of light via ultrasonic waves allows creating robust solid-state devices for precise and fast laser beam deflection. We describe a scheme of the optical tweezers with PC-driven two-dimensional scanning implemented by two sequential acousto-optical cells.
Light induced heating of silicon nanoparticles inside cervical carcinoma cells (HeLa)
Authors: Shiker A Y , Melchakova I V , Petrova M I , Makarova E K , Zyuzin M V , Milichko V A 
Published: April 2020

Abstract
All-dielectric nanoparticles have been recently emerged as unique components for biophotonics and drug delivery due to their resonant interaction with light providing the Raman thermometry and optical field enhancement. Here we report on the light induced heating the optically resonant silicon nanoparticles (Si NPs) up to 450 K, which were used to modify organic polymer based microcontainers. Moreover Si NPs were successfully employed for the imaging of intracellular compartments HeLa cells. The results will facilitate biocompatible usage of all-dielectric nanoparticles in medicine.
Origin of PL emission at 0.797 eV in near stoichiometric spray deposited CZTS thin films
Authors: Poornima N. , Rajeshmon V.G. , Sudha Kartha C. , Vijayakumar K.P. 
Published: April 2020

Abstract
Photoluminescence (PL) spectroscopy has been employed for analyzing defect levels in near stoichiometric Cu2ZnSnS4 (CZTS) thin films deposited using chemical spray pyrolysis (CSP) technique. An emission at 0.797 eV could be recorded at 15 K from the near stoichiometric CZTS thin films. This emission was persistent up to room temperature and could be identified as “donor to acceptor pair (DAP)” transition and also bears close connection with concentration of copper. Using temperature as well as excitation power dependent PL measurements and X-ray photoelectron spectroscopy (XPS) depth profile analysis, the emission at 0.797 eV could be identified as arising from transition between donor level (due to OSn defect) and acceptor level (created by Cuzn defect).
Analysis of resonance characteristics of surface plasmon-polariton modes at water-metal interfaces by Fano approximation
Authors: Nesterenko D. V. , Pavelkin R.A. , Hayashi S. , Soifer V.A. 
Published: April 2020

Abstract
We estimate the resonance properties of SPP modes excited at water-metal interfaces using Fano approximations in the ultraviolet, visible and infrared regions. The results obtained by Fano approximation correspond to the exact estimations and suggest more simple approach to analysis and design of resonance structures.
Time-resolved non-linear optical response and photo-induced carriers trapping in glassy semiconductors
Authors: Romanova E , Afanasiev A , Velmuzhov A , Sukhanov M , Kuzyutkina Yu , Nezdanov A , Shiryaev V 
Published: April 2020

Abstract
Two realisations of the pump-probe method have been used to study the time-resolved non-linear optical response of glassy chalcogenides at frequencies near their single-photon and two-photon bandgaps. Photo-excitation of gap states has been revealed as a determining effect for structural, electronic, thermal and optical changes in a glass sample.
The Methodology for Accessing the Accuracy of Apparent Diffusion Coefficient Determining
Authors: Sergunova K A , Akhmad E S , Semenov D S , Petraikin A V , Vasilev Yu A , Kivasev S A , Potrahov N N 
Published: April 2020

Abstract
One of the criteria for MRI neoplasms assessing is the apparent diffusion coefficient, which is calculated from the diffusion-weighted images. It is a measured parameter and is characterized by some error. A phantom including substances with self-diffusion limited to varying degrees was developed for quality assurance of diffusion-weighted images. The purpose of this work was to develop a methodology for determining the accuracy of methods and controls. The work included identification of errors sources and evaluation of each of them according to the results of numerical and phantom experiments. The method of MR-spectrometry has been used to evaluate the systematic error caused by the phantom control substances. The result of the evaluation of the phantom scan is an estimate of the magnitude of the random error determined by the operation of the tomograph. In addition, the effect of temperature variations on the measurements was evaluated. 11 experiments on tomographs of 5 different manufacturers were conducted. The accuracy of determining the apparent diffusion coefficient by each of them, as well as the comparison of the devices among themselves, showed a 16% variation.
DFT calculation of electric field effect on the energy profile of the CO oxidation reaction catalyzed by Ni nanoparticles
Authors: Serov Y M , Nestoklon M O , Gurevich S A 
Published: April 2020

Abstract
The DFT calculations of energy profiles for the carbon monoxide oxidation reaction in the presence of Ni catalyst in the various electric fields were performed by means of the Gaussian package. In order to do that the simple computational model was suggested for the active sites on the surface of the Ni catalyst prepared by the laser electrodispersion (LED) method. The data obtained demonstrate that the energy barriers on the reaction path, which the reaction kinetics is determined by, may be reducted in the electric field by factor from 12% up to 90%. This result supports the hypothesis, that the spontaneous charge redistribution in the catalytic systems produced by the LED method may affect significantly their catalytic activity.
Evolution of femtosecond laser-induced periodic structures formed on amorphous silicon surface
Authors: Shuleiko D V , Martyshov M N , Presnov D E , Zabotnov S V , Kashkarov P K 
Published: April 2020

Abstract
The laser-induced periodic surface structures (LIPSS) with period close to the femtosecond laser radiation wavelength (1.25 μm) were formed on amorphous hydrogenated silicon films (a-Si:H). The ripple ridges direction relative to laser radiation polarization was changed from perpendicular to parallel with increasing number of pulses from 50 to 1000. The experimentally observed LIPSS evolution is in a good agreement with the model proposed by J.E. Sipe where so-called efficacy factor depends on the real and imaginary parts of the dielectric constant and defines the LIPSS wave vector on the irradiated surface. In turn, the dielectric constant complex value is varied due to concentration change for the nonequilibrium electrons excited by different number of high-power femtosecond laser pulses. According to the theoretical modelling, the excited nonequilibrium electron concentration required for turning the LIPSS direction is equal to 8.2·1021 cm−3.
Strong negative longitudinal component of the Poynting vector in a tightly focused cylindrical vector beam
Authors: Stafeev S.S. , Nalimov A.G. , Kotlyar V.V. 
Published: April 2020

Abstract
It was shown that tightly focused cylindrical vector beam of m-th order produces reverse energy flow in the focal plane (m=2). If m=3 the reverse energy flow on the axis is equal to zero and near the axis it increases in proportion to a square of the distance to the axis. The azimuthally polarized beam of the m-th order is an example of a polarization vortex. Previously, the reverse energy flow in the focus was obtained only for vortex beams with a topological charge m and circular polarization. Numerically, using the FDTD method and the Richards-Wolf formulae, it was shown that in the focus of the zone plate such laser beams produce regions the Poynting vector opposite to the direction of propagation of the beam.
Compact Metamaterial-based Coil Element for Combined 1H/23Na MRI at 7T
Authors: Svejda Jan Taro , Rennings Andreas , Erni Daniel 
Published: April 2020

Abstract
High static magnetic flux densities in the field of magnetic resonance imaging (MRI) allow X-nuclei-based imaging and spectroscopy as well as the utilization of electromagnetic metamaterials. A compact dual-tuned coil element based on a metamaterial transmission line which achieves a quarter-wave resonance at the two distinct operating frequencies of the hydrogen and sodium nuclei is presented. In addition, first combined 1 H/23Na MRI measurement results from a structured phantom are shown and discussed.
Multimode electric ring resonator (ERR) for ultra-wideband (UWB) antenna with multi-notch band
Authors: Vendik I B , Rusakov A S 
Published: April 2020

Abstract
The electric ring resonator (ERR) is widely used for a design of metamaterials. The planar multimode ERR is considered as a promising structure for a design of multiband microwave devices. The ultra-wideband (UWB) planar antenna with multi-notch band is designed as a circular metallic patch fed by a coplanar waveguide (CPW) loaded with the ERR. To achieve the notched characteristics at desirable frequencies, the multimode ERR is incorporated into the CPW feedline of the planar UWB antenna. The notched frequency band is controlled by dimensions of the ERR structure. The antenna demonstrated a VSWR lower than 2.5:1 and consistent monopole-like, omnidirectional radiation patterns over a 4.8:1 bandwidth. A prototype of the antenna with physical dimensions of 50×50×1.52 mm demonstrates multi-notch characteristic at 3.5, 5.8, and 7.5 GHz in the 2.5 - 12 GHz frequency range
Ultra-thin gold films: towards 2D metals for photonic and optoelectronic applications
Authors: Volkov V S , Yakubovsky D I , Stebunov Y V , Kirtaev R V , Ermolaev G A , Mironov M S , Novikov S M , Voronin K V , Arsenin A V 
Published: April 2020

Abstract
Fabrication of continuous ultra-thin (<10 nm) and ultra-smooth gold films on different substrates is reported. Using a variety of electrical, optical and structural characterization techniques, we show that monolayer MoS2 can be superior to more conventional adhesion/seeding layers as an optical substrate for realizing ultra-thin gold films. Our results show that optical losses in ultrathin gold films increase with decreasing thickness due to the fine-grained structure and the presence of a small number of voids, however, they exhibit metallic properties down to a thickness of 3-4 nm.
TMOKE enhancement in structured all-dielectric iron-garnet films with waveguide modes
Authors: Voronov A A , Ignatyeva D O , Kozhaev M A , Levy M , Karki D , Belotelov V I 
Published: April 2020

Abstract
The idea of using nanostructured all-dielectric structures to enhance magneto-optical effects instead of plasmonic ones is attracting much interest. The use of dielectric materials allows one to avoid significant energy losses that are present in metals. In this paper, an experimental research of TMOKE effect in 1D dielectric magnetic structures was performed. Experimental results demonstrate a significant enhancement of TMOKE, as well as a high transparency and high Q-factor of the obtained resonances, which opens up broad opportunities for the use of such structures as light modulators.