bluuebunny/crossref_metadata_2025_split huggingface dataset:
High-amplitude radiofrequency pulses for metadevice-assisted MRI
Authors: Brui E A , Akhmetzyanov Sh Sh , Andreychenko A E 
Published: April 2020

Abstract
An aim of this study was to investigate whether magnetic resonance imaging of extremities benefits from the recently introduced wireless metamaterial based radiofrequency devices. Adapted radiofrequency safety limits provide an opportunity for application of high-amplitude radiofrequency pulses for the metadevice-assisted magnetic resonance imaging. The use of Shinnar-Le-Roux pulses for this purpose is explored. The performance of two widely used musculoskeletal pulse sequences is evaluated for standard SINC pulses and for Shinnar-Le-Roux pulses designed for this specific application. Metadevices provide room for image quality improvement and shortening of the study time while preserving the image quality.
Subwavelength gratings for creation and focusing of cylindrical vector beams
Authors: Degtyarev S.A. , Porfirev A.P. , Khonina S.N. 
Published: April 2020

Abstract
In this paper we derive the equations for the subwavelength grating vector of polarization element that creates the arbitrary order radially polarized beam. We show that the element can be implemented with different shape for different orientations of the input and output polarization. There are under consideration different essential cases of the first and the second order polarization. The second-order element can be sun- or mira- shape and axicon shape. Intermediate shapes are also possible.
Magnetic nanoparticles as vehicles for multidisciplinary medicine
Authors: Dendrinou-Samara C , Giannousi K , Antonoglou O 
Published: April 2020

Abstract
Magnetic nanoparticles (MNPs) can play a distinct role in theranostics such as magnetic drug delivery and hyperthermia via their distribution to the targeted area. The preparation of such MNPs is a challenging multiplex task that requires the optimization of size, magnetic and surface properties for the achievement of desirable target selectivity, while the sustained drug release is a prerequisite.
Quantum light sources based on deterministic microlenses structures with (111) In(Ga)As and AlInAs QDs.
Authors: Derebezov I A , Haisler V A , Haisler A V , Dmitriev D V , Toropov A I , Rodt S , Helversen M von , de la Haye C , Bounouar S , Reitzenstein S 
Published: April 2020

Abstract
The results of the development and implementation of a single photon source based on a bottom semiconductor Bragg reflector, top deterministic GaAs microlens structures and a single (111) In(Ga)As QD are presented. The structure of the microcavity ensures effective pumping of a single (111) In(Ga)As QD and high emission output efficiency, a clear single – photon emission was detected with a second – order correlation function at zero delay g(2)(0) = 0.07. A system of QD’s on the basis of AlXIn1-XAs/AlYGa1-YAs solid solutions has been studied. The usage of broadband AlXIn1-XAs solid solutions as the basis of quantum dots makes it possible to expand considerably the spectral emission range into the short-wave region, including the wavelength region near 770 nm being of interest for the design of aerospace systems of quantum cryptography. The optical characteristics of single AlXIn1-XAs quantum dots grown according to the Stranski–Krastanov mechanism are studied by the cryogenic microphotoluminescence method.
BIC-solitons in one-dimensional photonic crystal slab
Authors: Dolinina D A , Yulin A V 
Published: April 2020

Abstract
Dynamics of light in the periodically grated waveguide with defocusing Kerr nonlinearity was studied. Dynamically stable bound states in the continuum (BIC) were found in the considered system. Several types of nonlinear localized waves including solitons formed on BIC background were discovered. Stability and dynamics analyzes of the solitons were provided. A protocol of possible experimental observation of dark solitons was suggested.
Difficulties faced by Yee’s scheme in photonics problems
Authors: Dombrovskaya Zh O , Belov A A 
Published: April 2020

Abstract
Popular Yee’s scheme for the FDTD method faces a number of difficulties for problems in layered media: if dielectric permittivity is discontinuous, the accuracy strongly deteriorates, if magnetic permeability is also discontinuous at the same points, the scheme does not allow to perform computation. We provide rigorous mathematical explanation of these difficulties and show them to have fundamental nature. For problems involving dielectric media interfaces, we propose technique allowing to improve the accuracy.
Wide band enhancement of transverse magneto-optic Kerr effect in magnetite
Authors: Dyakov S.A. , Spitzer F. , Akimov I. , Yavsin D.A. , Pavlov S.I. , Verbin S.Y. , Tikhodeev S.G. , Gippius N.A. , Pevtsov A.B. , Bayer M. 
Published: April 2020

Abstract
Transverse magneto-optical Kerr effect (TMOKE) is known to be an effective tool for external magnetic field control of optical properties of magnetoplasmonic crystals. In some applications there is a demand for the pronounced TMOKE in the wide wavelength range. In this work we experimentally and theoretically demonstrate that a magnetite based magnetoplasmnic crystal exhibit a multiple wide band enhancement of TMOKE response in transmission compared to a plain magnetite film without metal. Our RCWA calculations are in good agreement with experimental results.
Perovskite solar cell improvement by gold nanoparticles prepared by laser ablation in liquid
Authors: Furasova A.D. , Lamanna E. , Colabro’ E. , Makarov S.V. , Di Carlo A. 
Published: April 2020

Abstract
Improving performance of lead halide perovskites solar cells (PSC) by nanoparticles (NPs) with localized surface-plasmon resonances is one of the most actively developing direction in modern photovoltaics. For this purpose, we propose to use simple and cheap way for NPs fabrication based on laser ablation of gold target in liquid, which can be added in any layer of PSC. By using these NPs we improve CH3NH3PbI3 (MAPbI3) perovskite-based solar cells performance from 17.7 to 18.6% via the increase of fill factor and voltage at zero current. The chosen concentration of Au NPs in the devices does not raise parasitic absorption, whereas the external quantum efficiency grows in all working distance of PCS. The proposed method can be simply implemented for PSCs with various compositions and architectures.
Collective resonances in hybrid photonic-plasmonic nanostructures
Authors: Ershov Alexander E. , Bikbaev Rashid G. , Rasskazov Ilia L. , Gerasimov Valeriy S. , Timofeev Ivan V. , Polyutov Sergey P. , Karpov Sergey V. 
Published: April 2020

Abstract
We present the theoretical model to predict the spectral position of Rayleigh anomalies emerged in hybrid system consisting of periodic array of plasmonic nanodisks embeded into the middle of defect layer of 1D photonic crystal (PhC). The spectral positions of these new emerged Rayleigh anomalies agree well with the results of exact simulations with Finite-Difference Time-Domain (FDTD) method.
Wave propagation in elastic bi-materials with a doubly periodic array of interface cracks
Authors: Golub Mikhail V. , Doroshenko Olga V. , Fomenko Sergey I. , Zhang Chuanzeng 
Published: April 2020

Abstract
In the present study, the scattering of plane elastic waves by a doubly periodic array of planar interface cracks is investigated. The problem is solved using the boundary integral equation method. The influences of the shape of cracks and lattice in the periodic array on wave transmission through an interface are studied. It is revealed that introduction of the periodic array of interface cracks allows to increase wave energy transmission compared to the interface without cracks. It is shown that the phenomenon is related to cut-off frequencies location and decrease in the amplitudes of the crack-opening-displacements.
Irreducible Cartesian multipole decomposition of scattered light with explicit contribution of high order toroidal moments
Authors: Gurvitz E , Ladutenko K , Dergachev P , Evlyukhin A , Miroshnichenko A , Shalin A 
Published: April 2020

Abstract
Multipole decomposition is a powerful tool for analysis of electromagnetic systems. This work considers high order irreducible Cartesian multipole moments in approximation of electric 32-pole and magnetic 16-pole. The explicit contributions to scattering of high order toroidal moments up to toroidal electric octupole and toroidal magnetic quadrupole are demonstrated for a dielectric high refractive index scatterer.
Silicon-silver metasurface based on regular bars as an effective SERS substrate
Authors: Ivanov Andrey , Sarychev Andrey K. , Bykov Igor , Boginskaya Irina , Lagarkov Andrey , Ryzhikov Ilya , Nechaeva Natalia , Kurochkin Ilya 
Published: April 2020

Abstract
Observation of the surface enhanced Raman scattering (SERS) is hampered by the background surface luminescence. We investigate the metasurface made of periodic silicon micro bars. Bars are covered by the silver nanolayer. Computer simulations as well as real experiment reveal an anomalous optical response of the metasurface, which is due to the excitation of various metal-dielectric surface resonances. We demonstrate the enhancement of the Raman signal from a monolayer of 4-Mercaptophenylboronic acid (MPBA) when it is deposited on the microbar metasurface. The micro-bar metasurface exhibits large Raman/luminescence (signal/noise) ratio. As result it operates as a very efficient SERS substrate.
New functionality in microwave interferometry by application of metastructure as a tunable beam-splitter
Authors: Kraftmakher G , Butylkin V , Kazantsev Y , Mal’tsev V 
Published: April 2020

Abstract
A new functionality of microwave interferometry is demonstrated by application of metastructure, meta-surface or meta-atom as controlled original beam-splitter in modified interferometer on basis of h-plane waveguide tee. Specific selectively-tunable interference peaks are observed in transmission of microwaves due to influence of metastructure properties on shape, frequency and intensity of interference peak, when controlled structure resonance approaches interference peak. We investigated following structures as a beam-splitter: ferrite plate, individual conductive resonant element in the form of varactor-loaded butterfly dipole, and metastructure wire grating/varactor-loaded copper strip placed orthogonally. The obtained results open new possibilities to design microwave multifarious multiband spectral filtering and implement selective electric or magnetic tuning, required in multifunctional and multichannel wireless communication.
3D Nanomanipulation: Design and applications of functional nanostructured bio-materials
Authors: Lega P.V. , Orlov A.P. , Frolov A.V. , Subramani R. , Irzhak A.V. , Koledov V.V. , Smolovich A.M. , Shelyakov A.V. 
Published: April 2020

Abstract
Recent progress in the development of the new functional materials opens up exciting possibilities for designing reconfigurable micro- and nano-structures and for operating mechanical nanotools which are controlled by external fields or heat. The nanotools such as nanotweezers with an active layer thickness of about several tenths of nm, and whose overall size is of the order of 1 μm can be applied to different micro- and nanoobjects. The present report gives an overview of the application of mechanical nanotools in 3D nanomanipulation of bio-nano objects such as micro biofibers DNA etc. The future prospects of mechanical bottom up nanomanipulation for biomedical technology, food technology are discussed.
Electric field-induced segregation in a sky-blue perovskite light-emitting diode based on CsPbBr2Cl:PEO composite
Authors: Liashenko T.G. , Anoshkin S.S. , Pushkarev A.P. , Pakštas Vidas , Zakhidov A.A. , Makarov S.V. 
Published: April 2020

Abstract
Perovskite light-emitting diodes (pero-LEDs) is a rapidly developing technology that is supposed to supersede existing ones in the near future. In comparison with organic and A
III
B
V
analogues, pero-LEDs possess the following advantages: very narrow spectral linewidth of electroluminescence (EL), spectral tunability in the whole visible range and the possibility of a cost-effective large-scale fabrication by means of wet chemistry techniques. CsPbX3 (X = Cl, Br, I) are the most robust perovskites suitable for LEDs production due to their excellent optical properties. There are numerous reports describing green and red electroluminescence of such tribromide and triiodide materials, respectively, whereas a blue color is not easy to achieve. The main obstacles in the way of development of blue pero-LEDs based on chlorine salts are poor solubility of perovskite precursors in the same organic solvents as well as light- and an electric field-induced phase instability of mixed-halide (CsPbBr3−x
Cl
x
) materials. The latter leads to red-shift of EL spectrum with the increase in applied voltage. In this work, we present a design of a single-layer sky-blue pero-LED based on CsPbBr2 Cl-poly(ethylene oxide) (PEO) thin film, study the morphology of the emissive layer, its phase instability under UV illumination and in the electric field.
Cerebral metabolism after one hyperbaric oxygenation session: 1H and 31P magnetic resonance spectroscopy study
Authors: Manzhurtsev A V , Vasiukova O R , Sergeeva V V , Menshchikov P E , Ublinskiy M V , Akhadov T A , Semenova N A 
Published: April 2020

Abstract
The aim of this study is to elucidate the effect of one HBO session on the concentrations of metabolites detectible by 1H and 31P magnetic resonance spectroscopy. An activation of energy metabolism that manifested in the decrease of creatinephosphate (PCr), pHint and increase α-ATP signal after a HBO session is revealed. Other ATP resonances remain unchanged. Also the reduction of N-acetyl aspartate by 3% in mediolateral prefrontal cortex (MPFC) with p<0.05 and in posterior cingulate cortex (p<0.1) was found. Glutamate levels remained unchanged after HBO session. The demonstrated metabolic changes may signify the activation of power supply processes in order to compensate the energy expenses caused by the excess of O2.
Rapid synthesis and optical properties of CsPbBr2Cl perovskite nanolasers
Authors: Markina D.I. , Pushkarev A.P. , Shishkin I.I. , Zuev D.A. , Makarov S.V. 
Published: April 2020

Abstract
Nanostructures able to generate laser emission in a broad spectral range of 420-820 nm have become highly demanded objects for nanophotonic and optoelectronic applications such as photonic integrated circuits and ultrasensitive Fabry–Pérot nanosensors. The latter require high quality factors (Q) of stimulated emission which can be achieved in cesium lead halide perovskite nanowires (NWs). In this regard, it is difficult to underestimate the relevance of their rapid and scalable synthesis at ambient conditions. In this work we study optical properties of high-quality CsPbBr2Cl NWs emitting in the 510-520 nm range manufactured by spraying at ambient conditions. The mechanism of NWs formation is based on their ligand-assisted reprecipitation (LARP). Ligands that form bonds with surface Pb atoms and, hence, prevent agglomeration of perovskite crystallites are supposed to be chosen according to the size of the certain perovskite unit cell. This approach allows obtaining numerous separate nanowires with lateral sizes of less than 1 μm and lengths of 2-50 μm. When the NWs are pumped with UV pulsed excitation above the lasing threshold (P ≈ 55 μJ cm−2) they exhibit high-quality stimulated emission with Q-factors at lasing modes up to 5600.
Propagating plasmon in periodical graphene structure
Authors: Mashinskiy K V , Popov V V , Morozov M Yu , Fateev D V 
Published: April 2020

Abstract
The transformation of electromagnetic wave into propagating plasmon in periodical dual-grating-gated graphene with asymmetric unit cell structure is theoretically investigated. The conditions of cancelling the transmission of the electromagnetic wave through the graphene structure and Fabry-Perot blocking the reflection are applied. We found out optimal unit cell asymmetry for maximum transformation incident wave into plasmon modes with the wavevectors multiplied the inverse length of the structure period.
Dielectric metamaterials with hexagonal lattice
Authors: Maslova E E , Rybin M V 
Published: April 2020

Abstract
We consider all-dielectric photonic structures with electric response consist of dielectric rods arranged in a hexagonal lattice. We construct gap map as a function of rod permittivity for a constant filling factor by analyzing photonic band diagrams. A near-boundary phase with a strong spatial dispersion is found, whereas in the case of a square lattice this phase does not exist. We observe ε-near zero modes in a metamaterial phase, which do not depend on a lattice orientation and a structure boundary.
Arrays of Metal Nanostructures for Plasmon-enhanced Spectroscopy
Authors: Milekhin A.G. , Kuznetsov S.A. , Rodyakina E.E. , Anikin K.V. , Milekhin I.A. , Veber S.L. , Latyshev A.V. , Zahn D.R.T. 
Published: April 2020

Abstract
We report on the study of localized surface plasmon resonances (LSPRs) arising in arrays of metal (Au) nanoclusters, dimers, and nanoantennas under the influence of external electromagnetic radiation. Using nanolithography, the plasmonic arrays with different morphologies including cylindrical nanoclusters and dimers, linear and H-type nanoantennas were fabricated. Their LSPR frequencies were determined from the analysis of optical reflection and IR spectra. LSPR frequency depends strongly on morphology of metal nanostructures and is varied from visible to terahertz spectral range with variation of the structures from cylindrical nanoclusters to the nanoantennas with a high aspect ratio. We established the interconnection between the structural parameters of the plasmonic arrays and their LSPR frequencies based on the results of 3D electrodynamic simulations.
Optically resonant graphite nanostructures
Authors: Nominé A , Ghanbaja J , Bruyère S , Krasilin A A , Mezenov Y A , Milichko V A 
Published: April 2020

Abstract
Here we report on the graphite crystalline nanostructures demonstrating polarization and size dependent light scattering due to the generation of different Mie-type optical modes inside.
A role of a picosecond strain in an ultrafast optically-driven phase transition in VO2 nanostructures
Authors: Mogunov Ia A , Lysenko S , Fedianin A E , Kent A J , Akimov A V , Kalashnikova A M 
Published: April 2020

Abstract
We report on experimental picosecond acoustic studies of an ultrafast photoinduced insulator-to-metal and structural transition in VO2 nanostructures epitaxially grown on Al2O3 substrates with different orientations. Applying a pump-probe technique with combined excitation of a sample with picosecond strain and femtosecond laser pulses we demonstrate that dynamical strain of moderate amplitude of 0.1% has a pronounced impact on ultrafast photoinduced phase transition in VO2 nanohillocks. This enables novel path for controlling such transitions at picosecond and nanometer scales. Our experiments also allowed characterizing elastic and photo-elastic properties of the photo-induced metallic phase in VO2 and to relate them to the properties of the equilibrium phase. Furthermore, we demonstrate the generation of picosecond strain pulses upon laser-induced excitation of thin epitaxial VO2.
Gd2O3, SiO2-Gd2O3 and SiO2-MnO2 nanoparticles as potential MRI contrast agents
Authors: Myshkina A.V. , Bazhukova I.N. , Zlygosteva O.A. , Byzov I.V. , Kasyanova V.V. , Sokovnin S.Y. , Ilves V.G. 
Published: April 2020

Abstract
Gd2O3, SiO2-Gd2O3 and SiO2-MnO2 nanoparticles were produced by the method of pulsed electron evaporation of oxide targets with condensation of the vapors in a vacuum. These materials are considered as probable contrast agents for magnetic resonance imaging (MRI). The Gd2O3 nanoparticles exhibit a rather high r1 and r2 relaxivities. These results point to the potential of using nanocrystals for MRI diagnosis. The mesoporous nanostructures SiO2-Gd2O3 and SiO2-MnO2 could be considered as multimodal theranostic agents.
Brewster effect in the broadband light reflectivity
Authors: Nesterenko D V , Kolesnikova M D , Lyubarskaya L V , Soifer V A 
Published: April 2020

Abstract
In this work, we analyze the characteristics of the Brewster effect at the air-glass interface for monochromatic and broadband polarized light. The obtained broadband light reflectivity spectrum demonstrates the modified resonance line shape. The effeciency of the Brewster effect for optical image processing is discussed.
Plasmonic properties of nanostructured graphene with silver nanoparticles
Authors: Novikov S M , Popok V N , Fiutowski J , Arsenin A V , Volkov V S 
Published: April 2020

Abstract
Ensembles of size-selected silver nanoparticles (NPs) deposited on nanostructured graphene using cluster beam technique are studied. Graphene is nanostructured by focused ion beam (FIB) to form arrays of holes. It is found that the deposited NPs are tended to collect in and around the holes in graphene. The graphene with NPs is covered by Rhodamine 6G and examined by Raman spectroscopy. It is shown that amount of so-called hot spots increases dramatically for the nanostructured graphene with Ag NPs in comparison with continuous graphene covered by the NPs at the same conditions. Hereby, combining 2D material, FIB and cluster beam deposition techniques allows to form nanostructured surfaces with advanced plasmonic properties to be applied in sensor technologies and surface enhanced Raman scattering.
MnO2 and TiO2 based Nanocomposites for Macroscopic and Individual Nanodevices in Sensing, Energy Storage and Photocatalysis Applications
Authors: Oo Than Zaw , Min Win Naing , Wint Theint Hay Mar , Koledov Victor , Gratowski Svetlana von 
Published: April 2020

Abstract
The present nanotechnological trend is promising for the devices based on nanocomposites. We focus on three application areas, biosensing, energy storage and photocatalyst. A newer frontier trend is related to individual nano-devices based on individual nano-objects giving the exciting advantages. In the present work, the MnO2 and TiO2 nanocomposites were developed by simple and economical means. The MnO2 and Cu/MnO2 were potentiodynamically deposited on stainless steel sheets and ITO coated glass substrates for energy storage and sensing applications. The electrochemically anodized TiO2 nanotubes and Ag nanoparticles decorated TiO2 nanotubes were fabricated on Ti base for photocatalysis. The MnO2 film electrode, Cu/MnO2 film electrode, Ag/TiO2 nanotubes were preliminarily demonstrated as macroscopic devices in capacitors, glucose sensors and photocatalysis water treatments. The specific capacitance of MnO2 film electrode is as high as 135 Fg−1and the Cu/MnO2 sensor has the low detection limit of 0.986. For the water purification, the photodegradation efficiency of Ag/TiO2 nanotubes is as high as 95% under UV irradiation.
Pyrolyzed 3D compound refractive lens
Authors: Abrashitova K A , Kulagin G E , Petrov A K , Bessonov V O , Fedyanin A A 
Published: April 2020

Abstract
X-ray synchrotron and laboratory source radiation is used to solve a wide range of problems in modern science. Compound refractive lenses (CRLs) technology is a popular solution for focusing x-ray. However weak interaction of X-ray radiation with matter puts extra challenges for microfabrication techniques and materials. Two-photon lithography has been successfully applied for polymer CRL microfabrication. However polymer material is likely to degrade in intense X-ray beams. This article describes pyrolysis (heating in inert atmosphere) as an improvement of two-photon lithography technique. This extra step may produce ultrasmall curvature radii CRLs with extra durability in intense X-ray beams