bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electron-energy-loss spectroscopy and cathodoluminescence for particles inside substrate
Authors: Kichigin Alexander A , Yurkin Maxim A 
Published: November 2021

Abstract
To simulate the interaction of a nanoparticle with an electron beam, we previously developed a theoretical description for the general case of a particle fully embedded in an infinite arbitrary host medium. The theory is based on the volume-integral variant of frequency-domain Maxwell’s equations and, therefore, is naturally applicable in the discrete-dipole approximation. The fully-embedded approximation allows fast numerical simulations of the experiments for particles inside a substrate since the host medium discretization is not needed. In this work, we study how applicable the fully-embedded approach is for realistic scenarios with relatively thin substrates. In particular, we performed test simulations for a silver sphere both inside an infinite host medium and inside a finite box or sphere. For the host medium, we considered two non-absorbing cases (the denser one causes Cherenkov radiation), as well as an absorbing case. The peak positions in the obtained spectra approximately agree between substrates a few times thicker than the sphere and the infinite one. However, a much thicker substrate (of the order of μm) would be required to have a qualitative agreement for absolute peak amplitudes. The developed algorithm is implemented in the open-source code ADDA, allowing one to rigorously and efficiently simulate electron-energy-loss spectroscopy and cathodoluminescence by particles of arbitrary shape and internal structure embedded into any homogeneous host medium.
Investigation of the Phonon Spectra in CdSe/CdS Nanoplatelets by Raman Spectroscopy
Authors: Kurus N.N. , Milekhin A.G. , Vasiliev R.B. , Saidzhonov B.M. , Anikin K.V. , Sklyar R.I. , Batsanov S.A. , Gutakoskii A.K. , Latyshev A.V. , Zahn D.R.T. 
Published: November 2021

Abstract
We report the phonon spectra of core/shell CdSe/CdS nanoplatelets with different shell thicknesses studied using Raman scattering. The nanoplatelets are rectangular colloidal nanocrystals, with thicknesses of core and shell layers of a few nanometers. The Raman spectra show features corresponding to the dominating longitudinal optical (LO) and surface optical (SO) phonon modes of the CdSe core in CdS shell located in the frequency regions of 200-210 and 250-290 cm-1, respectively. As the shell thickness increases, the phonon modes reveal a frequency shift and a change in intensity. The frequency shift associated with a change in the stress state in the core and shell, as well as with confinement effects is discussed. The phonon mode intensities are determined by the thickness of the shell and the proximity to resonant Raman scattering conditions.
Planar Modulated Reactance Surfaces for Endfire Antenna Applications
Authors: Kwon Do-Hoon 
Published: November 2021

Abstract
Modulated reactance synthesis for planar impenetrable electromagnetic surfaces for endfire radiation characteristics is presented. It is based on aperture field synthesis over the entire spectral range, where the desired radiation pattern is prescribed by a traveling-wave current over the aperture. Carefully constructed auxiliary waves in the evanescent spectrum are added and the total aperture fields are optimized such that the entire aperture surface becomes pointwise reactive. The optimized aperture fields define the modulated surface reactance that realizes the desired pattern when excited by a feed surface wave. The reactance distribution may be realized as modulated metasurfaces.
Long-Term Stable Structures Formed by Ion-Beam Modification of Silver Film for SERS Applications
Authors: Novikov S. M. , Streletskiy O. A. , Doroshina N.V. , Yakubovsky D. I. , Mironov M. S. , Sychev V. V. , Voronov A. A. , Arsenin A. V. , Volkov V. S. 
Published: November 2021

Abstract
Ensembles of silver nanoparticles (NPs) with size ~45 nm formed from the silver film using an ion beam modification are studied. The optical spectroscopy demonstrated that the fabricated ensembles of silver NPs keep stable their plasmonic properties in an ambient atmosphere for at least 39 days due to their monocrystalline nature. We use the scanning Raman microscope to map the SERS from Crystal Violet homogeneously adsorbed on these ensembles. It was found that the manufactured ensembles have a strong amplification factor, and this factor is preserved for these ensembles even after more than one month of storage in the surrounding atmosphere. Hereby, by ion beam modification of silver film, it is possible to fabricate the NPs with stable plasmonic properties and form nanostructured surfaces to be applied in sensor technologies and SERS.
Purcell enhancement of fluorescence from silicon-vacancy color centers in Mie-resonant luminescent diamond particles
Authors: Obydennov Dmitry V , Elyas Ekaterina I , Shilkin Daniil A , Yaroshenko Vitaly V , Zuev Dmitriy A , Lyubin Evgeny V , Ekimov Evgeny A , Kudryavtsev Oleg S , Vlasov Igor I , Fedyanin Andrey A 
Published: November 2021

Abstract
Over the past two decades, nanosized diamond particles with various luminescent defects have found numerous applications in many areas from quantum technologies to medical science. The size and shape of diamond particles can affect drastically the luminescence of embedded color centers. Here we study diamond particles of 250–450 nm in size containing silicon-vacancy (SiV) centers. Using dark-field scattering spectroscopy, we found that fundamental Mie resonances are excited in the spectral range of interest. We then measured the fluorescence saturation curves under continuous excitation to estimate the effects of the excitation and Purcell factor enhancement on the luminescent properties of the studied particles. The results show that the saturation excitation intensity differs by several times for particles of different sizes which is well explained by the numerical model that takes into account both the Parcell factor enhancement and resonant excitation.
DFT analysis of crystal polarity on graphene surface
Authors: Pavlov Alexander , Mozharov Alexey , Berdnikov Yury , Barbier Camille , Harmand Jean-Christophe , Tchernycheva Maria , Polozkov Roman , Mukhin Ivan 
Published: November 2021

Abstract
We report an ab-initio study of the preferred polarity for wurtzite GaN nanostructures on virtual graphene substrates. By means of the density functional theory analysis we show that N-polar nanostructures on graphene are energetically favorable in comparison to Ga-polar. These finding are in agreement with experimentally observed N-polarity of wurtzite GaN nanowires grown on graphene substrate. We believe that the revealed polarity preference is of importance for piezoelectric and optoelectronic device design.
Ablation-Free Laser Printing of Structural Colors in Reflection at 25,000 DPI
Authors: Pavlov D , Lapidas V , Zhizhchenko A , Storozhenko D , Kuchmizhak A 
Published: November 2021

AbstractUsing direct femtosecond laser patterning of metal-insulator-metal (MIM) sandwich designed to support Fabry-Perot mode in the visible spectral range we demonstrate new practically relevant strategy for high-resolution color printing. Irradiation of the MIM sandwich by tightly focused laser pulses allows to produce unique 3D surface nanostructures – hollow nanobumps and nanojets - locally modulating surface reflectivity. Laser processing parameters control the 3D shape of such nanostructures allowing to gradually tune the reflected color from reddish brown to pure green. Up-scalable ablation-free laser fabrication method paves the way towards various applications ranging from large-scale structural color printing to optical sensors and security labeling at a lateral resolution of 25,000 dots per inch.
Semitransparent visualizers of infrared lasers based on perovskite quantum dots
Authors: Polushkin A S , Zelenkov L E , Khmelevskaia D , Markina D I , Rogach A L , Makarov S V 
Published: November 2021

Abstract
These days halide perovskite is a very popular material to be applied both in photovoltaics and photonics due to its unique properties and low-cost methods of fabrication. High photoluminescence quantum yield and good nonlinear coefficients of perovskite material allow achieving multiphoton absorption in perovskite. Encapsulation of perovskite quantum dots in polymer matrix enables to prevent interaction with the environment and increase the material lifetime. In this paper, we present a semitransparent visualizer of infrared lasers working on two-photon absorption in halide perovskite nanocrystals encapsulated in the polymer matrix.
Temporal transition in parallel-plate waveguides: analysis of scattering and propagation at the temporal interface
Authors: Stefanini L. , Ramaccia D. , Toscano A. , Bilotti F. 
Published: November 2021

Abstract
In this contribution, we present the analysis and numerical verification of the scattering phenomenon from a temporal interface in a parallel-plate waveguide realized by suddenly modifying the dimensions of the waveguide while the wave is propagating. As it is well known in guided wave theory, at the interface between two different waveguides there exists a change of the effective refractive index and wave impedance perceived by the propagating wave within the device, which inevitably scatters at the interface into a reflected and refracted wave. In analogous way, by suddenly changing the effective material properties within the whole waveguide, it is possible to realize the so-called temporal interface, as well. Here, we theoretically and numerically investigate on the scattering from a waveguide temporal interface induced by the abrupt change of the waveguide dimension, which in turn realize a change of the effective material properties perceived by the wave.
Highly Chiral Exceptional Point in Perturbed Coupled Resonators
Authors: Ramezanpour S. , Ra’di Y. , Alù A. , Bogdanov A. 
Published: November 2021

Abstract
Exceptional point (EP) is a non-Hermitian spectral degeneracy that has application in ultrasensitive sensors and laser mode selectivity. By employing strong chirality in an optical system, the direction of light propagation can be controlled and subwavelength particles can be detected. Here, we show that EP with high chirality can appear in the coupled resonators perturbed by a scatterer, in which both the distance and position of the scatterer can be tuned. We achieve strong chiral EP in two different distances between the resonators, with chirality around 0.99 in both cases.
Retrieving the refractive index of a sphere from the phase spectrum of its light-scattering profile
Authors: Romanov A V , Yurkin M A 
Published: November 2021

Abstract
We studied the Fourier spectrum of the light-scattering profiles of single particles in the Rayleigh-Gans-Debye (RGD) and Wentzel–Kramers–Brillouin (WKB) approximations. In the case of a homogeneous sphere, we found the relationship between the key parameters of the spectrum (including its phase) and the sphere characteristics – both analytically and numerically in the framework of the approximations and the rigorous Lorentz–Mie theory, respectively. Based on these results, we have improved the existing spectral characterization method for spheres extending the applicability range to particles with a higher refractive index.
Nonlinear TMOKE enhancement in 1D Au/Py magnetoplasmonic crystals
Authors: Romashkina A. M. , Novikov V.B. , Murzina T.V. 
Published: November 2021

Abstract
Resonant optical properties of the magnetoplasmonic crystals, which support propagation of surface plasmon polaritons (SPPs) accompanied by magnetooptical effects, have found success in magnetic field driven control of optical radiation. In this work we investigate the resonant magnetooptical effects in the second harmonic generation in the magnetoplasmonic crystal formed by gold/pemalloy bifilm covering dielectric grating. Strong transverse magnetooptical Kerr with the contrast up to 30% is revealed in the spectral vicinity of the SPP excitation.
Supercattering Channels of Nonspherical structurers
Authors: Shamkhi H.K. , Canós Valero A. 
Published: November 2021

Abstract
A superscattering structure is an efficient energy-mapping device that of particular importance for various electromagnetic experiment methods, with potential sensing and energy harvesting applications. We study in this work the scattering cross-section of outgoing channels in the irreducible and singular basis for an arbitrary shape scatterer. The superscattering status is shown to occur within a single outgoing channel of an optimized cluster of cylinders, a forbidden mechanism in spherically symmetric Mie resonators.
A Mode Decoupling Method for Circular Patch Antennas
Authors: Siganov M. , Glybovski S. , Tatarnikov D. 
Published: November 2021

Abstract
In this contribution, we investigate the effect of mode decoupling for dual-feed circular patch antennas. We consider an antenna comprising a circular disc patch placed inside an annular-ring patch. Both patches are resonant radiators, which can be fed by two different vertical posts. Due to the field interaction of the patches, the feeds experience parasitic cross-talk limiting the receive diversity performance of the system. Here, we demonstrate the possibility to suppress the cross-talk at the operational frequency by including a capacitive decoupling element into the circular patch. The physical mechanism of the method consists in the excitation of two different eigenmodes (TM01 and TM11) in a certain combination canceling the mutual coupling. The presented decoupling method can be used for patches operating either at the same frequency or at two different frequencies. In the proposed dual-feed antenna it is possible to achieve an isolation level of better than -45 dB. In contrast to the method of decoupling and matching network used for the same type of antennas, one does not need couplers to feed the patches, which reduces losses.
UV/Ozone Treatment and Open-Air Copper Plasmonics
Authors: Solovey V. R. , Yakubovsky D. I. , Ermolayev G. A. , Lebedinskij Y. Y. , Markeev A. M. , Voronov A. A. , Zamboni F. , Popok V. N. , Arsenin A. V. , Volkov V. S. , Novikov S. M. 
Published: November 2021

Abstract
Thin copper films with thickness ∼28 nm deposited on SiO2 substrate with the vacuum electron beam evaporation method and treated by UV-ozone are studied. It was found that a UV-ozone treatment of the copper film causes rapid formation of the thin ∼3-4 nm oxide film. XPS analysis showed that CuO oxide predominates in this film. The formed oxide film effectively protects the copper against the following oxidation. The presented method of UV-ozone treatment is a simpler and cheaper approach compared to many other ways to form protective coatings of copper to preserve its functional properties. This method can be useful in nanoelectronic, nanooptical, and biosensors applications.
Omnidirectional Photonic Bandgap in Two-dimensional Photonic Quasicrystal Made of Near-Transparent Dielectric Material
Authors: Yafasov Ruslan , Sidorenko Mikhail , Rybin Mikhail , Petrov Alexander , Sayanskiy Andrey 
Published: November 2021

Abstract
Complete bandgap for all-dielectric photonic crystals in the microwave region can be obtained only by using high-contrast materials. This requires the usage of dielectric materials with high relative permittivity coefficient. In this paper, we study, both numerically and experimentally, a two-dimensional all-dielectric photonic quasicrystal made of polyurethane foam, which is considered in all microwave applications as a transparent material. The quasicrystal structure having an omnidirectional two-dimensional bandgap is mathematically generated by the direct inscription of Bragg’s peaks of the structure in the reciprocal space. The sample of the quasicrystal was manufactured on CNC (computer numerical controlled) milling machine out of foam with very low dielectric permittivity of 1.254. The numerical simulations and the experimental study are in good agreement with the theoretical model.
Numerical Study of Non-Radiating Near-Field Wireless Power Transfer System
Authors: Zanganeh E , Song M , Korobkov M , Evlyukhin A , Miroshnichenko A , Kapitanova P 
Published: November 2021

Abstract
The main challenge in near-field wireless power transfer systems is the increase of power transfer efficiency. It can be achieved by reducing ohmic or radiation losses of the resonators included in the system. In this paper, we propose and investigate numerically a non-radiating near-field wireless power transfer system based on transmitter and receiver implemented as dielectric disk resonators. The transmitter and receiver geometrical parameters are numerically optimized to operate at the frequency of non-radiating state of high refractive index dielectric resonators instead of magnetic dipole mode. Under the non-radiating state, we determine the frequency with almost zero radiation to the far-field. We numerically study the wireless power transfer efficiency as a function of operation distance between the transmitter and receiver and demonstrate that the higher efficiency compared to magnetic dipole mode can be achieved at non-radiating state for a fixed distance due to suppression of the radiation loss.
On the solvability of a boundary value problem for a quasilinear equation of mixed type with two degeneration lines
Authors: Rasulov Xaydar R. 
Published: November 2021

Abstract
The article investigates the existence of a generalized solution to one boundary value problem for an equation of mixed type with two lines of degeneration in the weighted space of S.L. Sobolev. In proving the existence of a generalized solution, the spaces of functions U(Ω) and V (Ω) are introduced, the spaces H1(Ω) and

H
1
*

(Ω) are defined as the completion of these spaces of functions, respectively, with respect to the weighted norms, including the functions K(y) and N(x). Using an auxiliary boundary value problem for a first order partial differential equation, Kondrashov’s theorem on the compactness of the embedding of

W
2
1

(Ω) in L2(Ω) and Vishik’s lemma, the existence of a solution to the boundary value problem is proved.
Program for Solving Assignment Problems and Its Application in Lecturer Resources Allocation
Authors: Wattanasiripong N , Sangwaranatee N W 
Published: November 2021

Abstract
This paper proposes program for solving assignment problems by Hungarian method. Assignment problem is one of the most famous problems in linear programming and in combinatorial optimization. It can be solved by using an efficient method which is called Hangarian method. In this problem, commonly, there are a number of agents and a number of tasks. Any agent can be assigned to perform any task. The objective of this problem is to decide the right agent to perform the right task and also the total cost of the assignment is minimized. The manual calculation is time-consuming and prone to mistake. Therefore, this program can help to find the optimal solution with less time. In this approach, computer programming is used as an implementation tool to get the accurate solutions. The program can also be applied with the lecturer allocation for each subject to minimize lecturer’s preparation time and to match the lecturer per individual expertise.
Some properties of germanene when adsorption of NH3 in the external field
Authors: Ngoc Hoang Van 
Published: November 2021

Abstract
This work studies on germanene when adsorbing NH3 gas, the system is placed in an 0 external electric field of 0.3 V / AÅ. By using the density functional theory (DFT) and VASP software, the properties of the energy band structure, the density of the state, and the charge displacement have been studied. There are four locations in which NH3 doped research is hollow, bridge, valley, and top. At the bridge position for the minimum adsorption energy, this indicates that the bridge position is the most optimal position when doped with NH3. The state density energy region structure, the charge displacement will be studied for the most optimal position. Placing the system in an external electric field will change the energy band structure as well as other properties of the NH3 doped germanene. This study will be useful for all steps of research in sensor or biomedical.
Structural, morphological and thermal analysis of pure and doped (Ho/Nd)-BFO multiferroics
Authors: Gokul C M , Mohan Aiswarya , Nair Soumya G , Dhanya S R , Satapathy Jyotirmayee 
Published: November 2021

Abstract
Pure BiFeO3(BFO) and 20% doped BFO with Holmium (Ho) and Neodymium (Nd) separately (Ho-BFO and Nd-BFO) samples are synthesized using solid state reaction method. Structural characterization is carried out using XRD and FTIR analysis. Further morphological study is performed to assist the structural analysis. In addition to these, thermal analyses such as tg-DTA comparisons are also presented here. These studies provide the understanding of impact of doping in modifying structure and related inherent properties of BFO multiferroics which are normally associated with their tuned electric and magnetic properties.
A comparative study of the dosimetric impact on IMRT planning with VMAT plans using a varying number of arcs in prostate cancer
Authors: Kumar D , Pradhan A , Singh L M 
Published: November 2021

Abstract
A study has been carried out to explore the impact by varying the number of arcs and beam arrangement on dose distributions. For this volumetric modulated arc therapy and 7-field, intensity-modulated radiation therapy plans have use for prostate cancer cases. The eclipse treatment planning system version 13.6 (Varian California, USA) was used to assess dosimetry data for 20 patients. All patients received intensity-modulated radiation therapy and volumetric modulated arc therapy plans with a varying number of arcs. 6MV X-Ray photon beam energy uses for each patient. Statistical plan assessments have been carried out for various dosimetric parameters to evaluate execution efficiency. There were no statistically significant changes (p>0.05) observed in D98% dose coverage while D2%, conformity index, homogeneity index, monitor unit, and treatment delivery time were showing statistically significant changes (p<0.05). In contrast to six arc volumetric modulated arc therapy and 7 field-intensity-modulated radiation therapy plans, Single arc volumetric modulated arc therapy plans showed 23.28 % and 25.96 % less monitor unit, 97.52 % and 137.53 % less treatment delivery time. It concluded that using a higher number of arcs in volumetric modulated arc therapy plans for prostate cancer improves plan efficiency. The four arc volumetric modulated arc therapy plans appeared to provide a reasonable trade-off between enhanced treatment delivery time and high treatment plan quality.
DFT analysis of Thymine adsorption on Ti doped graphene for biosensor applications
Authors: Qasem Jawaher , Pardeshi Prashant , Ingle Avinash , Karde Ravindra , Ali Shamsan , Lone Baliram 
Published: November 2021

Abstract
Density functional theory quantum chemical calculations have been performed to investigate the adsorption of thymine on pristine graphene (Gr) and Titanium doped graphene (GrTi) in order to explore the potential of doped graphene as adsorbent for biomolecule DNA nucleobase thymine. The various parameters including adsorption energy, mode of charge transfer, dipole moment, HOMO-LUMO gap and DOS confirms the Ti doped graphene can be good candidate as adsorbent for thymine in terms of biosensor applications.