bluuebunny/crossref_metadata_2025_split huggingface dataset:
Regimes of optical mode coupling: from core-shell single particle to dimer
Authors: Dmitriev Alexey A , Rybin Mikhail V 
Published: April 2020

Abstract
We study a transformation of a core-shell dielectric rod into a dimer by pulling the core rod out of the shell. We present simulated scattering spectra of two infinite dielectric rods with dipole Mie resonances tailored to the same frequency by choice of the refractive indices ratio. We identify a transition between weak and strong coupling regimes by examining the peak splitting of the dipole Mie resonance. We find that the splitting increases as the distance between the rod centres decreases. This behaviour is kept for all configurations: core-shell, eccentrically embedded rod and dimer.
Bright solitons in spontaneously formed polariton networks
Authors: Gavrilov S. S. 
Published: April 2020

Abstract
Bright solitons in a polariton fluid are excitations with a comparatively high intensity that flow without dissipation in spite of a finite lifetime of polaritons. Under resonant driving conditions, bright polariton solitons can be created using a two-beam excitation scheme which includes a plane-wave pump and a focused beam injecting a soliton at a certain location [O. A. Egorov et al., PRL 102, 153904 (2009)]. Here we discuss a new mechanism of soliton formation which takes place under plane-wave driving in a perfectly uniform microcavity wire—i.e., with no writing beams or seeding inhomogeneities. The key phenomenon underlying formation of solitons in this case is the spontaneous breaking of continuous symmetry and onset of periodic spin networks [S. S. Gavrilov, PRL 120, 033901 (2018)].
Semi-transparent lossy surfaces for cutoff of the fields in microwave shadow domain
Authors: Tatarnikov D V , Generalov A A 
Published: April 2020

Abstract
Semi-transparent surfaces for cutoff of the fields in the shadow domain of an antenna are considered. For relatively large screen sizes, the analytical synthesis procedure of the grid impedance is formulated in the approximation of geometric optics (GO), which provides a purely real impedance. For smaller sizes, a numerical procedure to synthesize realizable complex impedance has been implemented. A prototype of the compact antenna system with lossy semi-transparent impedance surface has been developed. No noticeable degradation of the antenna gain in the open space domain has been detected. Perspectives for further reduction in the screen size by employment of a dual-current layer are discussed; estimates of the serial impedance of the magnetic portion are provided.
Infrared localized surface plasmon dark multipole modes generated on subwavelength corrugated metal disks
Authors: Bulgakova V V , Gerasimov V V , Hafizov R R , Lemzyakov A G 
Published: April 2020

Abstract
Terahertz (THz) radiation is very promising for chemical and biological sensing. One of the ways to realize a THz sensor is exciting multipole localized surface plasmon resonances (LSPRs) on subwavelength corrugated metal disks. In this paper, numerical modeling and analysis of LSPRs on a periodic array of such structures were made. At normal incidence of the incoming wave, only dipole resonances can be excited. An additional C-shaped resonator placed in the vicinity of the disk produces dark multipole modes (quadrupole, hexapole, octupole, and decapole ones) due to hybridization of these modes with the brigth dipole mode of the C resonator. Besides, multipole modes can be excited at oblique illumination of the structure. With increase in the incident angle, the multipole resonances become stronger. The high Q-factor resonance modes observed for PEC disks are wider or disappeared in case of Drude gold permittivity.
Graphene-based optically tunable structure for terahertz polarization control
Authors: Grebenchukov Alexander , Zaitsev Anton , Masyukov Maxim , Litvinov Egor , Kvitsinsky Anatoly , Demchenko Petr , Kovalska Evgeniya , Baldycheva Anna , Khodzitsky Mikhail K. 
Published: April 2020

Abstract
We present a theoretical model of optically tunable graphene-based structure for polarization characteristics control of transmitted terahertz (THz) wave. The experimental verification was performed using a THz time-domain polarimetry setup. The tunability is achieved by applying an external optical pumping and magnetic field. The structure shows the possibility for dynamical control of ellipticity and azimuth angles of polarization state of THz radiation in a transmission mode. This study indicates a strong potential for using graphene-based structures for polarization sensitive applications such as THz wireless communications and biomedical research.
Nano engineering of quantum multifunctional structures with interferometers by mechanical “bottom-up” assembling
Authors: Orlov A.P. , Frolov A.V. , Smolovich A.M. , Lega P.V. , Shavrov V.G. , Zybtsev S.G. , Pokrovskiy V.Ya. , Fam V.Ch. , Irzhak A.V. , Bhatchatarria S. , Kolodev V. , von Gratoswki S. , Pakizeh T. 
Published: April 2020

Abstract
The creation of 3D ordered nanostructures represents an important technological problem for scientific research, nano-electronics, and nano-sensorics, because of the fact, that various nano-objects with useful physical and functional properties are synthesized as large arrays, but the selection, transfer and formation of 2D and 3D nanostructures should be done using tools comparable in size to the manipulated nano-objects. This paper describes the results of fabricating of the samples of suspended CNT and nanowire rings, presenting the configuration of quantum interferometers. The experiments on nanointegration of resonators are done by mechanical “bottom-up” assembling using nano-tweezers based on Ti2NiCu shape memory alloy. The prospects of the application of the mechanical bottom up nanointegration of 2D and 3D multiple resonators structures for wide band meta-surfaces and meta materials creation are discussed.
Optical properties of thin graphene oxide films and their biosensing applications
Authors: Komisar D A , Krivova G M , Stebunov Y V , Yakubovsky D I , Ermolaev G A , Arsenin A V , Volkov V S 
Published: April 2020

Abstract
Graphene oxide (GO) is a promising platform to realize immobilization matrices for plasmonic biosensors. Here, we discuss various aspect of the deposition of GO thin films, their optical properties, and the influence of GO linking layers on biosensing sensitivity. Using spectroscopic ellipsometry, we obtain dielectric functions of thin GO films deposited by spray-coating in the visible and near-infrared ranges. In addition, we demonstrate that the optimization of GO linking layers may sufficiently increase the sensitivity of SPR biosensing.
RF-resonator for clinical MR imaging in urology and andrology
Authors: Koreshin E A , Zubkov M A , Glybovski S B 
Published: April 2020

Abstract
New diagnostic visualisation and quantification methods of nerve tracks are needed in andrology and urology applications. In order for magnetic resonance imaging (MRI) to properly image the nerves of interest a dramatic signal-to-noise ratio (SNR) increase is required. For this purpose, radiofrequency (RF) resonator based on the birdcage operating principles has been designed, fabricated, measured and compared to simulation model obtained by time domain method in CST microwave studio. The resonator concentrate RF magnetic field in the centre of the resonator, while electric field remains on the edge thus preventing tissue heating. Design and parameters of resonator was optimised for human MRI on 1.5T scanners. Using the resonator allowed to improve RF-safety for 2 times, transmit efficiency for 10 times and SNR for 14 times compared to body coil only system. Measured and computed resonance frequencies and transmit efficiency are in good agreement.
Suppression of high-order multipole moments in a resonant periodic dipole chain
Authors: Kornovan D. F. , Baryshnikova K. V. , Petrov M. I. 
Published: April 2020

Abstract
In this work we study the properties of optical states in transverse subdiffractional dipolar chains of periodically spaced scatterers. We demonstrate that in this system there are states with low values of emission rates, and we explain this as a reduction of different multipolar contributions up to high values of orbital angular momentum. We also show that the emission rate for these states decreases as ∼ N
−6.76 with the number of scatterers.
Synthesis of perovskite nanoparticles in microfluidic chips
Authors: Koryakina I , Pushkarev A , Makarov S V , Zyuzin M V , Evstrapov A A 
Published: April 2020

Abstract
Organic-inorganic lead halide perovskites are the class of materials with unique physical properties that have attracted an interest in scientific and industrial communities. With microfluidic devices it is possible to obtain high-quality nanoparticles (NPs) based on perovskites of different physico-chemical properties such as size, shape, chemical composition. The aim of this work is to achieve the stable and reproducible synthesis of perovskite NPs on the microfluidic device. To obtain perovskite NPs two microfluidic chips (MFCs) of different topologies are investigated, where a porous membrane is introduced into MFCs using different methods: first method includes direct incorporation of commercial membrane into straight channel of MFC resulting in a "sandwich" structure, the second method implied membrane preparation as a part of a chip fabrication process. The results revealed that microfluidic devices allow synthesis of monodisperse perovskite NPs.
Optical manipulations via auxiliary substrates
Authors: Kostina N A , Ivinskaya A N , Kislov D A , Ginzburg P , Shalin A S 
Published: April 2020

Abstract
We report flexible optomechanical manipulations by the help of surface and volumetric modes of the substrate. Optical binding effect can be sufficiently enhanced due to both surface plasmon-polariton and hyperbolic modes of the structure. Volumetric modes of the structure provide optical pulling force for inclined incident plane wave, while surface waves cause enhancement of the optical trapping force under Gaussian beam illumination. Moreover, antitrapping effect can occur for specific positions of the beam waist.
Enhancement of the quantum dot photoluminescence using transfer-printed porous silicon microcavities
Authors: Kryukova I S , Dovzhenko D S , Rakovich Yu P , Nabiev I R 
Published: April 2020

Abstract
Enhancement of the photoluminescence signal intensity from organic and inorganic fluorophores increases the sensitivity of operation of optical sensors, detectors, and photonic diagnostic assays. Here, we have engineered and compared optical and fluorescence-enhancing properties of two types of one-dimensional porous silicon photonic crystals: a transfer-printed microcavity based on the freestanding photonic crystal and a conventional “one-piece” microcavity created on a monocrystalline silicon substrate. Comparative analysis of the eigenmodes and the photonic bandgaps of both types of microcavities demonstrated a high quality of transfer-printed microcavities and good correlation of their reflection spectra with the spectra of “one-piece” microcavities. Moreover, embedding of a highly concentrated solution of quantum dots (QDs) in the eigenmode localization region of transfer-printed microcavity was followed by three-fold reduction of the full-width-at-half-maximum of their luminescence spectrum at the microcavity eigenmode wavelength, thus confirming a weak coupling regime of QD exciton and microcavity eigenmode interaction and significant enhancement of QD luminescence within the microcavity.
Ultrafast acoustic switching of an optically pumped cavity polariton system in the bistable regime
Authors: Demenev A. A. , Gavrilov S. S. , Sherbakov A. V. , Yaremkevich D. D. , Kukhtaruk S. M. , Yakovlev D. R. , Kulakovskii V. D. , Bayer M. 
Published: April 2020

Abstract
Nonequilibrium transitions are investigated in a plane exciton-polariton system with complex acousto-optical excitation: stationary resonant optical excitation of polaritons along the normal to the surface of the resonator and picosecond strain pulses causing reversible exciton energy perturbations. It is shown that acoustic pulses can be used for ultrafast switching of the optical response of a bistable polariton system. Switching is experimentally implemented in a high-Q GaAs microcavity.
Nonlinear optical properties of Sponge Si/Au nanoparticle
Authors: Larin Artem , Ageev Eduard , Shiker Anna , Nomine Alexandre , Makarov Sergey , Zuev Dmitry 
Published: April 2020

Abstract
Plasmon sponge nanostructures have occupied a special role in the field of plasmonics and nanophotonics: sensors and advanced source of white emission. If the pores of a golden spongy nanostructure are filled with silicon, the result will be a promising source of broadband radiation with high efficiency due to the localization of the field by a structure with a high surface-to-volume ratio. This paper presents the results of photoluminescence generation with multiphoton absorption and second-harmonic generation obtained from hybrid sponge Si/Au nanoparticles. The particles have been fabricated by femtosecond laser ablation at room temperature in the air. Experiments have shown the ability to generate broadband photoluminescence in the range of 500 – 800 nm (0.93 eV). The obtained results can be applied for creation of white light luminescent metasurfaces and advanced nanophotonic spectroscopy devices.
Multi-spectral interference imaging using laser-induced plasma light source
Authors: Machikhin A S , Polschikova O V , Vlasova A G , Gorsky E V , Churin A E , Subin A N 
Published: April 2020

Abstract
Interference imaging techniques are widely used for studying surface and internal structure of various objects. By varying the operating wavelength of the interference system, one can also obtain the information about the spectral properties of the inspected specimen. For multi-spectral interference imaging applications, wide-band high power light sources are necessary. Most of the existing sources suffer from speckle noise, low brightness or high price. In this paper, we demonstrate the applicability of a laser-induced plasma light source for interference imaging and quantitative phase measurements. Narrow-band spectral filtration of its illumination within a wavelength range 240-2600 nm allows to design cost-effective schemes for a variety of metrological applications including digital holography and spectral-domain optical coherence tomography.
Near-field scanning magneto-photoluminescence of composite fermions in In(Ga)P/GaInP quantum dots
Authors: Mintairov A M 
Published: April 2020

Abstract
We measured spatial and magnetic field dependence of photoluminescence (PL) spectrum of In(Ga)P/GaInP quantum dots (QDs) having up to 8 electrons and quantum confinement ħω
0 down to 2 meV using low temperature (10K) near-field scanning optical microscope (NSOM) providing spatial resolution ∼20 nm and external magnetic field up to B0=10 T. Using these measurements we identified QDs having Wigner-Seitz radius up to 2 and internal magnetic field B
int up to 15 T, corresponding to Landau level filling factor v at zero field ν
0 3, 5/2, 2/5 and 1/5. In magneto-PL spectra we observed features related to integer and fractional quantum Hall states and identified composite fermion (CF) states corresponding to Wigner molecule isomers (1, 5) and (0, 6). Our results demonstrate perspectives of using In(Ga)P/GaInP QD structures, providing deterministic localization of CFs in zero external magnetic field, in “magnetic-field-free” topological quantum gates.
Optical and luminescent properties of ceria nanoparticles produced by gas phase method
Authors: Myshkina A V , Bazhukova I N , Kiryakov A N , Sokovnin S Y , Il’ves V G , Kasyanova V V 
Published: April 2020

Abstract
The study on luminescent and optical properties of ceria nanoparticles allow one to indirectly assess the defectiveness of the material crystal lattice. The decomposition of the luminescence spectrum in the Gaussian bands shows the presence of Ce3+ ions in the CeO2 crystal lattice, as well as optical active centers, probably associated with oxygen vacancies. These characteristics permit us to estimate the relative amount of Ce3+ ions in the crystal lattice and could be considered as an important prerequisite for the use of nanoparticles as redox agents in industry and medicine.
Magneto-optical properties of plasmonic hyperbolic metamaterials
Authors: Novikov V B , Kolmychek I A , Pomozov A R , Leontiev A P , Napolskii K S , Murzina T V 
Published: April 2020

Abstract
The results of the experimental studies and numerical simulation of optical and magneto-optical properties of composite structures containing gold nanorods in porous anodic alumina templates and coated by a continuous nickel film are presented. We reveal two features in the Faraday rotation spectra of the structures in the vicinity of the wavelengths of 540 nm and 810 nm, which correspond to the epsilon-near-pole and epsilon-near-zero regions, respectively. Experimentally observed distinct enhancement of magneto-optical effects in the structures in the spectral vicinity of these points are consistent with the simulation results and open up novel opportunities for magnetic-field-assisted light manipulation.
Electrophysical parameters of P3HT:PCBM solar cells
Authors: Onishchuk D A , Parfenov P S , Litvin A P , Shcherbinin D P , Baranov A V , Fedorov A V 
Published: April 2020

Abstract
Using the dark capacitance–voltage and current–voltage characteristics we analyzed the electrophysical parameters of P3HT:PCBM solar cells with addition of PbS nanocrystals. The influence of the device architecture on the built-in potential value and ideality factor are considered. The process of space-charge limited current characterizing is also described.
Emitting properties of a-Si:C:H films with a gold submicron grating
Authors: Pavlov S I , Dyakov S A , Samusev A K , Nashchekin A V , Tanklevskaya E M , Feoktistov N A , Gippius N A , Tikhodeev S G , Pidgayko D , Pevtsov A B 
Published: April 2020

Abstract
In this study reflection and photoluminescence spectra of a-Si:C:H thin film with gold grating on it was examined theoretically and experimentally. The hydrogenated amorphous amorphous silicon-carbon alloy films were fabricated by the PECVD technique. Arrays of gold stripes with different gold width were created by lift-off e-beam lithography. Reflection, and PL spectra has been measured by a Fourier imaging spectroscopy. The theoretical calculations are in a good agreement with experimental results. From the PL spectra it follows, that the TE polarization gives sharper and more efficient PL signal than the TM polarization, and PL efficiency almost does not depend on gold stripes widths. It was shown that only in TE modes the PL outcouples from the gratings owing to the fact that there is no plasmon’s affect in this polarization.
Acousto-optic properties of metamaterials
Authors: Petrov N I , Pustovoit V I 
Published: April 2020

Abstract
The possibility of efficiently using metamaterials in acousto-optics has been demonstrated. Diffraction of light in heterogeneous medium with non-uniform spatial distribution of dielectric nanoparticles taking into account absorption of light is investigated. It is shown that by changing the concentration of dielectric nanoparticles in the medium, complete elimination of side oscillations and suppression of the “tails” of the diffraction reflection curve can be achieved. The possibility of controlling the hardware function of acousto-optic devices by changing the material, concentration, size, shape and spatial orientation of the inclusions, as well as the polarization of the incident radiation is shown.
Fabrication of nano-micro-sized 14C enriched constructive elements in plasma deactivation treatment of irradiated reactor graphite
Authors: Petrovskaya A S , Kladkov A Yu , Surov S V , Stakhiv M R , Tsyganov A B 
Published: April 2020

Abstract
We propose a new fabrication method for the meta-material said "beta-active nano-sandwich" (for example, enriched with radioisotope 14C, etc.) by a plasma sputtering technology that we are developing for the decontamination of nuclear power plants constructions. This new kind of beta-active nano-materials can be a valuable product resulting from nuclear deactivation process and be useful for nuclear medicine applications and creation of advanced beta-voltaic batteries. Plasma sputtering device operation is based on a “dry” plasma decontamination method – the ion sputtering of radionuclides from the radioactively polluted surface (e.g., irradiated reactor graphite). We present calculations results of the plasma sputtering device operating parameters: anode and cathode surface temperature, discharge input power density, equivalent current density, ion sputtering and mass-transfer rates of nano - layers from the processed graphite surface.
Sublayer induced enhancement of electric and magnetic dipole scattering of dielectric nanoparticles
Authors: Pidgayko Dmtiry , Ladutenko Konstantin , Bogdanov Andrey 
Published: April 2020

Abstract
In this paper, we numerically investigate the effect of a low-index sublayer on resonant dielectric nanoparticle placed on a high-index substrate. We show that the scattering cross section depends in a resonant manner on the thickness of the sublayer. In addition, the position of the maxima can be controlled by changing the angle of incidence and polarization of the incident radiation. Finally, we give an example of flexible control of the electric and magnetic dipole responses by changing the angle of incidence and polarization in a system with a subwavelength sublayer.
Nonlinear optical properties of tellurium oxide nanoclusters
Authors: Roginskii E M , Smirnov M B , Noguera O , Masson O , Thomas P 
Published: April 2020

Abstract
The finite field method using ab initio hybrid functional approach was applied to estimate nonlinear properties of the cluster based on paratellurite crystal structure. The good agreement was found with previously reported data.The method demonstrate high efficiency in prediction of nonlinear properties for a wide ensemble of sufficiently large polyatomic clusters.
Interaction between dielectric particles enhances the Q factor.
Authors: Bulgakov E. N. , Pichugin K.N. , Sadreev A. F. 
Published: April 2020

Abstract
We consider resonant modes of two dielectric identical particles which can be classified as symmetric and anti symmetric combinations of the resonant modes of individual particles. We show that an approaching of two particles gives rise to an avoided crossing of resonant poles because of interaction between the disks. That in turn results in strong enhancement of the quality factor factor of two disks compared to isolated disks.
Formation of phase clusters and chimera states in hierarchical networks of Josephson junctions
Authors: Safina Olga S. , Tsironis George P. 
Published: April 2020

Abstract
We demonstrate regimes such as cluster synchronization and chimera states in a hierarchical network based on Josephson Junctions. We find that the fractal spectrum of possible system frequencies of the system forms a devils staircase. Hierarchical networks have interesting fractal features and could be used for scaling of some properties of fractal networks. In our structure, Josephson Junctions are connected through electric currents in the form of a Cayley tree.