bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parametric study of metamaterial-inspired resonator for wireless power transfer
Authors: Markvart A. , Song M. , Belov P. , Simovski C. , Kapitanova P. 
Published: April 2020

Abstract
A metamaterial-inspired resonator for free-positioning wireless charging of several devices is proposed and numerically studied. The resonator is based on orthogonal metallic wires arrays deposited on a high permittivity low loss dielectric substrate. Given a fixed area of 50 × 50 cm, its resonant frequency can be tuned in a wide frequency band from 5 MHz to 45 MHz. A parametric study is performed to reveal the influence of resonant frequency, dielectric permittivity and number of wires on Q-factor.
Electromagnetics of two-dimensional materials with time-varying carrier density
Authors: Maslov Alexey V. , Bakunov Michael I. 
Published: April 2020

Abstract
The variation of carrier density in two-dimensional materials, such as graphene, creates opportunities for rapid control of guided wave propagation which can find numerous applications in optoelectronics. A general theoretical approach to calculate the transformation of the surface wave guided by a two-dimensional material is presented. The frequencies of the excited modes and their energies are analyzed. Our results refute the claims of plasmon amplification under rapid density changes that appeared in recent theoretical studies. The difference in the results stems from the different treatment of the microscopic current during the carrier density changes.
Flexible plasmonic and strain sensors: fabrication, design and perspectives
Authors: Gontier Arthur , Marae-Djouda Joseph , Hmima Abdelhamid , Proust Julien , Bercu Nicolas Bogdan , Joncour Léa Le , Stagon Stephen , Konoplev G. , Tarasov S. A. , Adam Pierre-Michel , Gardan Julien , Panicaud Benoît , Molinari Michael , Maurer Thomas 
Published: April 2020

Abstract
In this paper, we aim at debating the perspectives for plasmonic strain sensors which have attracted interest for the past five years. In particular, we strive to discuss the choice of strategy to increase the sensitivity, either by developing random or ordered assemblies of metallic nanotsructures.
Ceramic resonator as an alternative to the highly dense receive arrays in MRI
Authors: Mikhailovskaya A , Shchelokova A , Slobozhanyuk A , Andreychenko A 
Published: April 2020

Abstract
Radiofrequency coils are an essential magnetic resonance imaging hardware component. They directly impact the spatial and temporal resolution, sensitivity, and uniformity in the MRI. Advances in radiofrequency equipment have led to the creation of many designs that are optimised for specific clinical applications. Here, the potential of ceramic resonators is investigated to replace radiofrequency surface coils. Three structures were compared: a ceramic resonator, a loop size comparable to the size of a ceramic resonator, and a loop whose size was smaller than the size of a ceramic resonator.
Second harmonic generation enhancement of 2D metal-organic framework using silicon nanoparticles
Authors: Kulachenkov N K , Milichko V A 
Published: April 2020

Abstract
Here we report on the 10 times enhancement of nonlinear optical signal coming from layered Cu-based metal-organic frameworks (MOFs) by means of placing of optically resonant silicon nanoparticles on the top of MOFs. These nanoparticles placed on the top of single MOFs allow the optical field localization and enhancement inside the framework due to the generation of Mie-type modes.
Realizing Caustics in Acoustic Fields
Authors: Moeini S , Memoli G , Subramanian S 
Published: April 2020

Abstract
We present a method to realise a wide class of caustics in acoustic fields created by a set of phase holograms realized with metasurfaces. Given the desired caustic shape, we discuss how to identify the phase distribution along the metasurfaces and describe the calculations needed for determining the pressure field in the vicinity of the caustic. The results of this work can be used in realising acoustic traps controllable with acoustic metamaterials.
One step synthesis Pd/NiO@rGO/CNTs nanocomposite for energy storage as supercapacitor application
Authors: Kumar Rajesh , Abdel-Galeil Mohamed M. , Matsuda Atsunori , Moshkalev Stanislav A. 
Published: April 2020

Abstract
In this study, graphite oxide was reduced into reduced graphene oxide nanosheets (rGO NSs) by microwave with metal acetate of nickel and palladium to form the rGO-carbon nanotubes (CNTs) containing palladium (Pd) and nickel oxide (NiO) nanocomposite (Pd/NiO@rGO/CNTs nanocomposite). The synthesized nanocomposite presents remarkable performance for supercapacitor application especially in stability, exhibiting specific capacitance of 24 F/g at scan rate of 10 mV/s and excellent capacitance retention of 95% after 500 consecutive CV cycles at scan rate of 100 mV/s.
A tiled dual-polarized transmitarray with 1-bit quantization
Authors: Munina I , Turalchuk P , Kirillov V , Verevkin A , Zelenchuk D 
Published: April 2020

Abstract
An original approach of a transmitarray which consists of the tiled unit cells placed in a plastic holder is considered. Each unit cell represents a passive receiver-transmitter structure with integrated phase-shifter, which can take either of two coding states corresponding 180° phase difference between the states. The transmitarray design supports two orthogonal linear polarizations. An example of a 10x10 element 1-bit beam steering transmitarray operated in C-band is presented. The results of radiation pattern measurements with single and multifeed excitation are shown. The proposed structure represents a cost-efficient solution for scalable transmitarrays.
Electron-phonon interaction in colloidal CdSe quantum dots embedded in different solid matrices
Authors: Karimullin K R , Arzhanov A I , Es’kova A E , Magaryan K A , Naumov A V 
Published: April 2020

Abstract
Colloidal semiconductor nanocrystals (quantum dots, QD) manifest specific temperature dependent luminescence. Here we analyse temperature dependences of CdSe QD luminescence spectrum shift for different composites: polymers, glasses, crystals. The analysis was performed in the terms of electron-phonon coupling, that allows to find and compare the parameters of this interaction. The matrix influence on the T-dependence is also discussed.
Nonlinear Optical Response of Hybrid Exciton State in Quantum Dot- Dendrite Systems
Authors: Huong Nguyen Que 
Published: April 2020

Abstract
A “real space” Green’s function method and a diagrammatic technique are used to study the optical response of the semiconductor-organic hybrid exciton in quantum dot-dendrimer system. The energy of the hybrid exciton and the linear and non-linear susceptibilities have been calculated for a sample of quantum dot-dendron ligand. Enhanced non-linearity is obtained, which is controlable by the number of generations, the size and structure of the QD-dendrimer systems.
Synthesis of SERS-encoded nanotags: From single nanoparticles to highly brilliant complex core-satellite structures
Authors: Pazos-Perez Nicolas , Alvarez-Puebla Ramon 
Published: April 2020

Abstract
In this work, we report novel methods to produce SERS encoded nanoparticles (SEPs). Either as single nanoparticles (NPs) or as more complex core-satellites structures. Single NPs are produced in an easy and fast one-pot approach which, are further use as building blocks to produce the core–satellite SEPs. The presented protocols are very versatile allowing the NPs SERS codification with an extensive variety of Raman codes. Moreover, this protocol can be applied to different NPs materials and shapes. Furthermore, the core–satellite SEPs are designed to exhibit minimal interparticle distances (<2–3 nm) with maximum satellite loading (i.e., maximum number of hot spots per assembly), while positioning the encoding agents at the gaps to achieve a very high optical efficiency. In addition to such versatility, these fabrication methods are simple, cheap, scalable and robust, yielding stable SPEs in high yields.
Development of anticancer drug delivery system based on bone marrow-derived multipotent mesenchymal stem cells
Authors: Peltek Oleksii O , Muslimov Albert R , Zyuzin Mikhail V , Karpov Timofey E , Timin Alexander S 
Published: April 2020

Abstract
Nowadays, a number of anticancer drugs are inadmissible due to their high toxicity. However, this matter can be addressed with improvements in pharmacokinetics, which would allow to generate localized high concentrations of antitumor drugs with minimal systemic toxicity. Such an effect can be achieved by utilizing high encapsulating properties of polyelectrolyte microcapsules with further modification of therapeutically relevant cells capable of pathotropism with these microcarriers. In the present work we studied the effect of drug carrier size on the migration properties of the human multipotent mesenchymal stromal cells (MMSCs). The conducted study included experiments on internalization efficiency, overall toxicity, migration index and speed in order to optimize the properties of the resulting cell-based drug delivery system. In addition to that the ability to directed migration of modified MMSCs along the gradient of tumor-associated chemokines (SDF-1) was explored using chemotaxis slides and 3D tumor tissue model. The results demonstrated that the combination of MMSCs and drug-loaded microcapsules resulted in a delivery system which possesses the ability to actively migrate into tumors, was not toxic towards cell carriers and overall had a therapeutic potential.
Resonance absorption of visible light by subwavelength gratings
Authors: Petrov N I , Danilov V.A. , Popov V.V. , Usievich B.A. 
Published: April 2020

Abstract
Diffraction of light of a visible spectral range by subwavelength metal gratings is investigated theoretically and experimentally. It is demonstrated that under certain conditions an effect of plasmon resonance occurs, at which a complete absorption of the incident radiation takes place. It is shown that the influence of the incident beam width on the diffraction efficiency is significant for the incident angles, at which the plasmon resonance occurs.
Nanosecond Laser Surface Silver Metallization of Wet Ion Exchanged Glasses
Authors: Reduto I , Wackerow S , Zolotovskaya S , Abdolvand A , Lipovskii A , Svirko Yu 
Published: April 2020

AbstractSilver ions are embedded in glass slides by a traditional “wet” ion exchange technique. The glass slides irradiation by 10 ns laser pulses at 355 nm wavelength leads to the formation of metal-like film at the surface. Scanning electron microscopy shows that the films presents a dense layer of silver nanoparticles about the same size and separation. Varying the irradiation parameters results in a significant difference in the transmission spectra of the slides. Particle size grows when the laser power increases.
Bound-state in the continuum of a photonic crystal metasurface: a platform for ultrasensitive sensing and near field amplification
Authors: Romano Silvia , Zito Gianluigi , Yépez Sofía Natalí Lara , Penzo Erika , Cabrini Stefano , Coppola Giuseppe , Rendina Ivo , Luca Anna Chiara De , Mocella Vito 
Published: April 2020

Abstract
The localization of the electromagnetic field at the nanoscale can play a key role in many applications, such as sensing, spectroscopy and energy conversion. In the last years, great efforts have been performed to study and realize all-dielectric loss-free nanostructures to confine the radiation without the limits imposed by the plasmonic systems. Here we demonstrate that the field enhancement in proximity of a photonic crystal metasurface supporting bound states in the continuum can be explored to boost the light-matter interaction. We design and realize an innovative sensing scheme for bulk and surface measurement with ultra-high figure of merit and apply this new configuration for studying a specific protein-protein interaction. The recognition scheme can be coupled to a fluorescence-based sensing approach, which exploits the capability of the sensor to strongly enhance fluorescence signals. Our results provide new solutions for light manipulation at the nanoscale, especially for sensing and nonlinear optics applications.
Coupling of SiV-containing nanodiamonds to a Fabry-Perot microcavity
Authors: Romshin A M , Kudryavtsev O S , Pasternak D G , Ekimov E A , Vlasov I I 
Published: April 2020

Abstract
The possibility of increasing the spontaneous emission rate for silicon-vacancy (SiV) centers in nanodiamonds placed in a Fabry-Perot microcavity was studied. For this purpose, a plano-concave open access microcavity was designed. The cavity was tested using diamond nanocrystallites, placed on a flat mirror. Nanodiamonds were synthesized from adamantane and Si-containing adamantane derivative by high pressure, high temperature (HPHT) technique. The controlled room temperature cavity coupling gives rise to a resonant Purcell enhancement of the SiV zero-phonon line by a factor 1.4.
Synthesis of Metal Oxide Nanomaterials for Early Lung Disease Detection
Authors: Sajor N J , Foronda J R , Olarve R S , Dela Torre H M , Santos M G , Lopez T B , Haygood K J , Santos G N , Koledov V , Gratowski S V 
Published: April 2020

Abstract
Metal oxide nanomaterials from bulk zinc oxide and tin oxide powders were synthesized via Horizontal Vapor Phase Crystal Growth deposition technique. Synthesized nanomaterials were deposited in a silica quartz tube where it acts as sensing element of the gas sensor. Volatile organic compounds (VOCs) were utilized as identifier for lung disease which served as analytes to interact with the gas sensor. The sensitivity test was measured using its response time and voltage difference. An immediate voltage response time with an average of 3 seconds was observed upon exposure of the analyte to the sensor. Selectivity test was analyzed through radar plots of tin oxide and zinc oxide which depicted that each metal oxides have distinct sensing capabilities in terms of sensed VOC gases.
Hybrid functional materials for tissue engineering: synthesis, in vivo drug release and SERS effect
Authors: Saveleva M. S. , Ivanov A. N. , Prikhozhdenko E. S. , Yashchenok A.M. , Parakhonskiy B. V. , Skirtach A. G. , Svenskaya Y. I. 
Published: April 2020

Abstract
The research presents the designing new hybrid biocompatible materials aimed to bone tissue engineering with enhanced osteoconductivity and functionality. The scaffolds consisted of electrospun polymeric matrix, modified with porous calcium carbonate (vaterite) coatings, were developed and studied. The subcutaneous implantation tests in vivo with white rats demonstrated the high degree of biocompatibility of vaterite-mineralized scaffolds. Moreover, the performed in vivo release of bioactive molecules, immobilized in mineral coating of scaffold, allowed to control the regeneration process in tissues in the implantation area. Also, the decoration of mineralized scaffold with silver nanoparticles exhibited the capability of exploiting these materials as effective substrates with providing surface enhanced Raman scattering (SERS) for precise detection of low concentrations of analyte. In this way, developed scaffolds can be promising materials with enhanced functionality of tissue regeneration, in vivo drug release and detection for designing novel smart devices for biomedicine.
Ultrafast all-optical GaAs nanoswitch for photonic integrated circuitry
Authors: Snigirev V S , Shorokhov A S , Sitnyansky V A , Fedyanin A A 
Published: April 2020

Abstract
All-dielectric nanophotonics offers favourable opportunities for engineering of devices for various practical tasks. In this regard, a very promising field is integrated photonic circuitry, where the implementation of all-dielectric components can significantly increase the performance of nanodevices. In this paper, we numerically investigate a system formed by an ultrafast all-optical switch – a GaAs dimer nanoantenna – and a GaAs strip waveguide. The simulation of the light scattering in that system shows the relative change of the waveguide transmission coefficient ∆T/T up to 12.3 % for the fluence of the pumping pulse 0.19 mJ·cm−2. This proof-of-principle result paves the way for potential applications of the system as a logic element for nanophotonic chips.
THz generation and frequency manipulation in AFM/HM interfaces
Authors: Stremoukhov Pavel , Safin Ansar , Kirilyuk Andrei 
Published: April 2020

Abstract
In this paper, we propose an approximate nonlinear theory of a spintronic terahertz-frequency oscillator based on antiferromagnet-heavy metal interfaces. We present a model of excitation of nonlinear oscillations of Neel vector in an antiferromagnet under the action of terahertz pulses of an electromagnetic field. We determine that, with increasing pumping pulse amplitude, the spin system response increases nonlinearly in the fundamental quasi-antiferromagnetic mode. Our results theoretically show that a spin-current flowing from a heavy metal due to the spin-Hall effect vary the frequencies of the output EM oscillations in a wide range, which could be detected by a standard pump-and-probe spectroscopy. Our study paves the way to laser-induced, electrically tunable, low-power, ultrafast AFM-based oscillator that operates without external magnetic fields at room temperature for telecommunication systems, bio-inspired networks and optical networks on chip. The nonlinear dynamics of the antiferromagnet-based emitters discussed here is of importance in terahertz-frequency spintronic technologies.
Toroidal Moments Probed by Electron Beams
Authors: Talebi Nahid , Guo Surong , Campos Alfredo , Kociak Mathieu , van Aken Peter A. 
Published: April 2020

Abstract
Toroidal moments have recently attracted attentions as an individual class of moments, by expanding the vector potential and decomposing the third component into toroidal moments and magnetic quadrupoles. Toroidal moments sustain peculiar time-space symmetry relations and are known as hybrid modes, which can be only understood by including retardation effects. Here, we outline our recent attempts to realize toroidal moments in void oligomeric meta-molecules. These structures are investigated experimentally using electron energy-loss spectroscopy and numerically using finite-difference time-domain method. We discuss about various toroidal moments supported by these structures, the role of symmetry and topology in excitation of these moments, the radiation from electron-induced toroidal moments resolved by cathodoluminescence spectroscopy, and finally hybridization of toroidal moments in coupled oligomers. Our findings outline the necessity of including toroidal moments within the classes of electromagnetic moments, despite the current discrepancy about their significance.
Fabrication of halide-perovskite resonant microcylinders by nanoimprint lithography
Authors: Polushkin A S , Kruk S , Malurean R , Tiguntseva E Yu , Zakhidov A , Bogdanov A A , Kivshar Y , Makarov S V 
Published: April 2020

Abstract
Halide perovskites are promising materials for optoelectronic devices, solar cells and various photonic applications due to their unique optical and electronic properties and low-cost fabrication. Halide perovskites micro and nanoscale structures have demonstrated high resonance properties last decade. Moreover, these materials allow high throughput creation of advanced nanophotonic designs employing nanoimprint lithography. Here, we develop this fabrication approach to create halide perovskites resonant microcylinders. Our study of the obtained microobjects demonstrates that the nanoimprint lithography yields desirable size and shape, as well as preserved photoluminescent properties of the microcylinders.
Light induced temperature decrease of semiconductor nanoparticle
Authors: Tonkaev Pavel , Zograf George , Petrov Mihail , Makarov Sergey 
Published: April 2020

Abstract
We demonstrate model of light induced refrigeration of single semiconductor resonant spherical nanoparticles. In this paper, we reveal that cooling efficiency can be increased by several times in comparison with bulk material due to excitation of optical Mie-resonances in the nanoparticles. We believe that such approach can be promising for the implementation of all-optical laser cooling devices.
Substrate effects in graphene field-effect transistor photodetectors
Authors: Voronin K V , Ermolaev G A , Stebunov Y V , Arsenin A V , Bylinkin A N , Jensen B B E , Jørgensen B , Volkov V S 
Published: April 2020

AbstractIn present study, we introduce graphene field-effect transistors (G-FET) fabricated on silicon - silicon dioxide wafers and analyse their properties. Electric and photoelectric effects in these devices were experimentally observed and discussed. We demonstrate that the understanding of the processes occurring in the substrate is of high importance not only for the development of all types of photodetectors based on field-effect transistors, but also could be used for the designing of devices with novel functionalities.
Collective magnetic modes excitation in GaAs nanoclusters by azimuthally polarized vector beams
Authors: Yagudin D F , Kroychuk M K , Shorokhov A S , Fedyanin A A 
Published: April 2020

Abstract
We investigate optical response of oligomers of dielectric nanodisks made of GaAs – anisotropic material with bulk quadratic nonlinearity. By using numerical approach, we analyse linear response of nanoparticle clusters in the vicinity of the magnetic dipole resonance for two types of incident radiation: linearly polarized plane wave and azimuthally polarized vector beams. Achieved results may be used to design highly efficient nonlinear optical nanoantennas with controllable radiation characteristics.
Polarization hybridization of surface waves on anisotropic metasurface
Authors: Yermakov Oleh , Hurshkainen Anna , Dobrykh Dmitry , Kapitanova Polina V. , Iorsh Ivan V. , Glybovski Stanislav B. , Bogdanov Andrey A. 
Published: April 2020

Abstract
In this work we conduct numerical and experimental characterization of mixed TE-TM polarized surface waves on an anisotropic metasurface in the super high frequency range (from 2 to 8 GHz). We investigate the evolution of equal frequency contours for eigenmodes. The drastic changes of the equal frequency contours shapes, called topological transitions, are observed. Finally, we experimentally demonstrate the polarization hybridization of two localized surface modes.
Simulating optical properties of extremely oblate inhomogeneous particles with the discrete dipole approximation
Authors: Smunev D A , Yurkin M A 
Published: April 2020

Abstract
The discrete dipole approximation (DDA) is a general volume-discretization method for simulating optical properties of arbitrary particles. We employ the formulation of the DDA with rectangular-cuboid dipoles (voxels) and analyze it in the limit of very small thicknesses of both dipole and scatterer. Taking the limit of zero thickness greatly simplifies the theoretical formulation, resulting in the Rayleigh-Debye-Gans approximation combined with the boundary conditions at the plane interface. This can also be computed in the framework of the DDA, for which we developed a specialized modification of the open-source code ADDA. We also proved that the scattering quantities computed with the standard (3D) code are independent of number of dipoles along the particle thickness, when the latter is sufficiently small. This justifies the usage of dipole monolayers for practical simulations, including those for finite-width metasurfaces.