Alexander P. Anyutin

Alexander P. Anyutin

Russian Academy of Sciences
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Alexander P. Anyutin has a total of 16 co-authors. Here are the top co-authors by number of shared publications:

Latest Publications

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    Plasmon resonances of the gold nanofiber coated with quartz layer

    by A.P. Anyutin

    In this work, a two-dimensional problem of diffraction of a plane H polarized wave in the light range 300 nm < λ < 900 nm (λ – is the wavelength) by a nanostructure formed by a gold nanocylinder coved with a symmetric quartz layer is considered. The frequency characteristics of the scattering cross-section and plasmon’s resonances are calculated by rigorous numerical methods. The influence of the cylinder’s radius and radius of the quartz layer, relative permittivity and gold loss on the spectra of the scattering cross-section is investigated.

    Cited by 1
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    Study of the Deep Processes of COVID-19 in Russia: Finding Ways to Identify Preventive Measures

    by Alexander P. Anyutin, Tatiana M. Khodykina, Ekaterina I. Akimova, Elena V. Belova, Ekaterina A. Shashina, Denis V. Shcherbakov, Valentina V. Makarova, Nadezhda N. Zabroda, Anna A. Klimova, Nina A. Ermakova, et al.

    The novel coronavirus disease 2019 (COVID-19) pandemic has had a huge impact on all areas of human life. Since the risk of biological threats will persist in the future, it is very important to ensure mobilization readiness for a prompt response to the possible emergence of epidemics of infectious diseases. Therefore, from both a theoretical and practical standpoint, it is currently necessary to conduct a thorough examination of the COVID-19 epidemic. The goal of this research is to investigate the underlying processes that led to the COVID-19 pandemic in Russia and to identify ways to improve preventive measures and ensure mobilization readiness for a quick response to potential COVID-19-like pandemics. This research will analyze the daily dynamics of the number of infection cases and the number of new lethal cases of COVID-19. We analyzed the daily number of new cases of COVID-19 infection N(d), the daily number of new lethal cases L(d), their percentage ratio L(d)/N(d) 100% in Russia for 2 years of the pandemic (from the beginning of the pandemic to 23 March 2022), the rate of increase and decrease of these indicators (dN(d)/dd and dL(d)/dd), as well as their spectra created on the basis of wavelet analysis. Wavelet analysis of the deep structure of the N(d) and L(d) wavelet spectra made it possible to identify the presence of internal cycles, the study of which makes it possible to predict the presence of days with the maximum number of infections and new deaths in a pandemic similar to COVID-19 and outline ways and methods for improving preventive measures and measures to ensure mobilization readiness for a rapid response to the potential emergence of pandemics similar to COVID-19.

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    Plasmon Resonances in a Convex–Concave Silver Nanoshell

    by A. P. Anyutin

    The two-dimensional problem of diffraction of a plane electromagnetic wave is considered as a TM-type on a cylindrical nanoshell (structure) of silver, the outer and inner contours of the cross section of which are symmetrical convex-concave curves. In the wavelength range \(320\,{\text{nm}} < \lambda < 1500\,{\text{nm}}\) (\(\lambda \) is the wavelength), the spectra of the scattering cross section, scattering diagrams, and the structure of the near field for resonant wavelengths are calculated by a rigorous numerical method. The influence of the geometric dimensions of the structure, the angle of incidence of a plane wave, and the relative permittivity of the shell core on the scattering cross section and the scattering diagram is studied. It is shown that such shells exhibit pronounced multipole resonances, the effect of near field degeneration, and the possibility of shifting the dipole resonance to the region of λ ≈ 1500–1700 nm and a significant difference in resonant wavelengths between dipole and multipole resonances.

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    Bound Plasmon Resonances in a Linear Cluster of Six Silver Nanocylinders

    by A. P. Anyutin

    The two-dimensional problem of diffraction of a plane wave in the light range, (\(300\,\,{\text{nm}} < \lambda < 900\,\,{\text{nm}}\), \(\lambda \) is the wavelength) on a linear cluster consisting of six identical silver nanocylinders is considered. Strict numerical methods are used to calculate the frequency characteristics of the scattering cross section, scattering diagrams, and the spatial distribution of the plasmon field near the cylinders. The influence of the angle of incidence, the radius of the cylinders, and the distance between the cylinders on the spectra of the scattering cross section, the scattering diagram, and the structure of the near field of plasmons has been studied. It is shown that the structure of the spectrum of normalized scattering diameter \(k{{\sigma }_{{\text{s}}}}\) is the number of its maxima (resonances), the effect of the degeneracy of the maxima, as well as the nature of the coupled oscillations and resonances of plasmons depend significantly on the geometric parameters of the cluster.

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    Bound Plasmon Oscillations and Resonances in a Triangular Cluster of Three Silver Nanocylinders

    by A. P. Anyutin

    —The two-dimensional problem of diffraction of a plane wave in the light range is considered. \(300\,\,{\text{nm}} < \lambda < 900\,\,{\text{nm}}\) (\(\lambda \) is wavelength) on a triangular cluster consisting of three identical silver nanocylinders located at the corners of an equilateral triangle. The frequency characteristics of the scattering cross section and the spatial distribution of the plasmon field near the cylinders are calculated by rigorous numerical methods. The influence of the angle of incidence of a TM-type plane wave, the radius of a cylinder, the distance between the cylinders, and the loss of silver on the spectra of the scattering cross section and the structure of plasmons has been studied. The effects of “degeneracy” of resonances in a cluster, the formation of local and coupled plasmon resonances, and also the transition of a plasmon resonance to a resonance of the inner region of the cluster are found.

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    Plasmon Resonances in a Star-Shaped Golden Nanocylinder

    by A. P. Anyutin

    Two-dimensional problem of diffraction of a plane electromagnetic TM wave by a cylindrical golden 2D nanostructure is considered. The contour of the cross-section of this structure is a star-shaped curve. The spectra of the scattering cross section and scattering pattern are calculated using a rigorous numerical method in the light wavelength range 400 nm < λ < 900 nm. The influence of the medium loss and geometric dimensions of the structure on the scattering cross section and scattering pattern is investigated. It is shown that it is typical for this structure to have one resonance of the scattering cross section and several resonances in the scattering spectrum in the region of values \(kD < 1\) (where \(k = {{2\pi } \mathord{\left/ {\vphantom {{2\pi } \lambda }} \right. \kern-0em} \lambda }\), \(D\) is the maximal dimension of the structure, and \(\lambda \) is the wavelength). It is also shown that, because of the real gold loss, it is impossible to observe multipole resonances of the scattering cross section. The effect of the degeneracy of plasmons and the near field of the structure is discovered. The influence of the geometric dimensions of the structure on the scattering cross section and absorption spectrum is demonstrated.

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    Plasmon Resonances in a Cluster Formed by a Convex–Concave Silver Nanocylinder with Two Cylindrical Glass Inserts

    by A. P. Anyutin

    We considered a two-dimensional problem of diffraction of a plane electromagnetic TM-type wave on a cylindrical nanostructure (cluster) formed by a convex–concave silver cylinder with two symmetrically inserted glass cylinders. In the light wavelength range of \(300\,\,{\text{nm}} < \lambda < 900\,\,{\text{nm}}\) the spectra of the scattering cross section and the scattering patterns were calculated by a rigorous numerical method. The influence of the losses of the medium, the geometric dimensions of the structure, the angle of incidence of a plane wave on the scattering diameter, and the scattering pattern are investigated. It is shown that, in the quasi-static region, the presence of the concavity of the outer contour of the cluster and glass inserts leads to the formation of additional maxima of the scattering diameter and a shift of the resonance wavelengths compared with the case of a convex contour. The existence of the effect of degeneracy of plasmon resonances and a weak dependence of the cluster scattering pattern on the angle of incidence of plane polarized TM-waves.

    Cited by 1
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    Plasmon Resonances in a Convex–Concave Silver Nanocylinder

    by A. P. Anyutin

    The paper considers a two-dimensional problem of diffraction of a plane electromagnetic TM-type wave on a cylindrical silver nanostructure the cross-sectional contour of which is a convex–concave curve (Cassini oval). In the light wavelength range \(300\,\,{\text{nm}} < \lambda < 900\,\,{\text{nm}}\) the spectra of the scattering diameter and the scattering diagrams were calculated by a rigorous numerical method. The influence of the losses of the medium, the geometric dimensions of the structure, and the angle of incidence of a plane wave on the scattering diameter and the scattering diagram are investigated. It is shown that in quasi-static region \(kD < 1\) (\(k = {{2\pi } \mathord{\left/ {\vphantom {{2\pi } \lambda }} \right. \kern-0em} \lambda }\), \(D\) is the maximum size of the structure, \(\lambda \) is the wavelength) the presence of the concavity of the scatterer contour leads to the formation of additional (in comparison with the case of a convex contour) maxima of the scattering diameter. A decrease in the value of the minimum of the scattering diameter by three to four orders of magnitude was found.

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    Plasmon Resonances in Circular and Elliptic Nanocylinders Made of Premium Metals

    by A. P. Anyutin

    —A two-dimensional problem of the diffraction of a plane electromagnetic wave of the TM type by a cylindrical nanostructure made of silver or gold, the cross-sectional contour of which is a circle or an ellipse with a different ratio of the semiaxes, is considered. In the wavelength range \(300\,\,{\text{nm}} < \lambda < 900\,\,{\text{nm}}\) the spectra of the scattering diameter and scattering diagrams were calculated by a rigorous numerical method. The influence of the losses of the medium, the geometric dimensions of the structure, and the angle of incidence of a plane wave on the scattering diameter and the scattering diagram are investigated. It is shown that the position of the dipole resonance and the number of multipole resonances for the silver (gold) nanostructure depend on the thickness of the structure, its length, and the angle of incidence of the plane wave. In this case, real losses of silver (gold) make it impossible for the existence of higher multipole resonances.

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    Plasmon Resonances in a Rectangular Silver Plate with a Symmetrically Inserted Rectangular Glass Nanofiber

    by A. P. Anyutin

    The two-dimensional problem on the diffraction of a plane electromagnetic wave of ТМ-type on a nanostructure composed of a square silver plate with an inserted square glass nanofiber was considered. In the optical region of wavelengths, the short- and long-range fields and the scattering spectra were calculated by rigorous numerical methods. The effect of silver losses, the thickness of structure walls, and the incidence angle of a plane polarized TM-wave on the resonances of plasmons was studied. The splitting and degeneration of quadrupole and dipole resonances were shown to occur in such a structure.

    Cited by 1
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