Перегляд за автором "Nerukh, A. G."
Зараз показано 1 - 11 з 11
Результатів на сторінку
Варіанти сортування
Публікація Airy Pulse Transformation by an Accelerated Medium Boundary(CAOL, 2019) Zhyla, O. V.; Nerukh, A. G.; Gnatenko, A. S.In the statement of a problem with a moving boundary there is one more idealization, namely, movement stationarity assuming that the movement has begun at infinite past time. Abandoning this idealization, by considering a movement that begins at a finite moment of time, leads to the appearance of new peculiarities in the wave transformation on a moving boundary. In this paper such peculiarities are considered with an abrupt uniform movement of a boundary beginning at zero moment of time, as well as with a smooth “turning on” of a boundary movement according to a relativistic uniformly accelerated law. In the latter approach the continuity of a boundary velocity change allows the development of the evolution of the wave transformation process to be traced.Публікація Airy Pulse Transformation by an Accelerated Medium Boundary(CAOL, 2019) Gnatenko, A. S.; Zhyla, O. V.; Nerukh, A. G.In the statement of a problem with a moving boundary there is one more idealization, namely, movement stationarity assuming that the movement has begun at infinite past time. Abandoning this idealization, by considering a movement that begins at a finite moment of time, leads to the appearance of new peculiarities in the wave transformation on a moving boundary. In this paper such peculiarities are considered with an abrupt uniform movement of a boundary beginning at zero moment of time, as well as with a smooth "turning on" of a boundary movement according to a relativistic uniformly accelerated law. In the latter approach the continuity of a boundary velocity change allows the development of the evolution of the wave transformation process to be traced.Публікація Changing of an Airy pulse form due to re-reflections inside a dielectric layer(YSF, 2016) Kuryzheva, O. V.; Nerukh, A. G.A problem of Airy pulse transformation by a plane-parallel layer is considered. A problem formulation is equivalent to a case of permittivity sharp change in a dielectric layer at zero moment of time. It allows to use the resolvent method for solution of the Volterra integral equation describing this phenomenon. It is shown a virtual structure of a pulse field inside the layer. Influence of a number of pulse re-reflections from the layer boundaries on a form of a primary pulse is analyzed.Публікація Evolution of an Airy pulse energy flow induced by a dielectric plane boundary(CAOL, 2016) Kuryzheva, O. V.; Nerukh, A. G.Transformation of energy flows of an electromagnetic Airy pulse by a plane boundary of a dielectric is considered. It is shown that a problem formulation is equivalent to a case of a permittivity sharp change in a half space at zero moment of time. It allows to use the resolvent method for solution of the Volterra integral equation describing the phenomenon. Explicit expressions for transmitted and reflected pulses are obtained and energy flows are analyzed.Публікація Implementation of the extinction theorem in a problem of Airy pulse scattering by a dielectric layer(UWBUSIS, 2016) Kuryzeva, O. V.; Tkach, A. D.; Nerukh, A. G.A problem of Airy pulse transformation by a plane-parallel layer is considered. Solving of this problem is made by the Volterra integral equation method in two stages. Finding of an electrical field inside a layer is implemented on the first stage. The fields of reflected as well as transmitted pulses are calculated on the second stage. The virtual structure of the pulse field inside the layer consists of some terms one of which extinctions the initial pulse according to the Ewald-Oseen extinction theorem.Публікація Modeling of Frequency Conversion in a Chain of Coupled Resonators due to Time Change in Permittivity(ХНУРЭ, 2012) Sakhnenko, N. K.; Nerukh, A. G.This paper considers the transformation of natural modes of single and coupled dielectric resonators when their material is subject to an abrupt time change in permittivity. Both the transient response and the new steady state regime are described in detail. Possibility of frequency shift is demonstrated. Enhancement of the frequency shift for the coupled modes with odd-odd symmetry in the chain has been shown.Публікація Modelling of transient plasmons dynamics in metallic cylinders(IEEE, 2012) Sakhnenko, N. K.; Chipouline, A.; Nerukh, A. G.; Stognii, N. P.; Pertsch, T.Transient pulsed beam excitation of the surface plasmon polaritons in metallic cylinder and hypothetical cylinder having both negative real parts permittivity and permeability is visualized and analyzed. The complex source point concept is used to simulate an incident transient beam. Rigorous mathematical method based on the Laplace transformation has been applied. Time domain field representation is obtained through the evaluation of the residues at singular points associated with the eigenvalues of the structure and integrals along the branch-cuts of a complex plane.Публікація Near-field patterns images of a cylindrical plasma column(IEEE, 2011) Stognii, N. P.; Sakhnenko, N. K.; Nerukh, A. G.This paper demonstrates abilities of plasma columns to reflect and transmit radiation, and excitation of surface plas-mons is also shown. Images of near-field patterns are obtained based on analytical eigenfunction-series solution.Публікація Plasmon resonances in linear array of coupled silver nanowires(IEEE, 2011) Stognii, N. P.; Sakhnenko, N. K.; Nerukh, A. G.In this paper, theoretical study of plasmon resonant coupling in a finite linear array of infinite-long silver nanowires is presented. The spectral response and optical near fields are considered. It was shown red-shifting of plasmon resonance with increasing of the number of nanowires in the array and optical field enhancement for closely spaced nanowires. Theory is based on the Mie series expansion.Публікація Properties of decelerating non-diffractive electromagnetic airy pulses(ХНУРЭ, 2012) Nerukh, A. G.; Zolotariov, D. A.; Nerukh, D. A.The existence of electromagnetic pulses in time domain with the Airy function envelope is shown. The pulses satisfy an equation similar to the Schrodinger equation but in which the time and space variables play opposite roles. The pulses are generated by an Airy time varying field at a source point and propagate in vacuum preserving their shape and magnitude. The pulse motion is according to a quadratic law with the velocity changing from infinity at the source point to zero in infinity. Properties of such pulses are investigated in detail.Публікація Radiation of accelerating pulses with specified envelopes(ICATT, 2015) Nerukh, A. G.; Zolotariov, D. A.; Kuryzheva, O. V.A problem for radiation of time accelerating electromagnetic pulses is considered in paraxial approximation. It is shown that the pulse envelope moves in the time-spatial coordinates on the surface of a cylinder, the parabolic one for the pulse in the form of Airy function and for the hyperbolic one for Gaussian. Each of the pulse propagates in time with deceleration along the dominant propagation direction and drifts uniformly in the lateral direction stopping at infinity.