Перегляд за автором "Sakhnenko, N. K."
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Публікація Accurate investigation of coupled plasmonic resonances in a chain of silver nanowires(IEEE, 2016) Stognii, N. P.; Sakhnenko, N. K.This paper presents investigation of plasmonic properties of coupled metal nanowires arranged to form a finite linear chain. Coupled plasmon resonances of such structures embedded into dielectrics with different dielectric permittivity are studied. The main goals of the paper are to validate true potential of a plasmon nanowire-based structure in sensing applications and to reveal optimized configurations with narrowband plasmonic resonances and enhanced sensitivity.Публікація Bonding and antibonding combinations of plasmons in aggregates of plasma columns(IEEE, 2012) Stognii, N. P.; Sakhnenko, N. K.Theoretical investigation of the plasmonic resonances of coupled cylindrical plasma columns is presented. Mechanism of plasmonic mode coupling in a pair of coupled plasma columns and in a cluster with square configuration that can be considered as bonding and antibonding combinations of isolated column plasmons is investigatedПублікація ‘Bright’ and ‘dark’ plasmons in the systems of metal nanowires(IRE, 2014) Stognii, N. P.; Sakhnenko, N. K.Many authors find SPs by investigating resonance peaks in Scattering Cross Section (SCS). This study cannot be considered as a complete one, because in this way only ‘bright’ plasmons can be seen, ’dark’ plasmons that do not couple efficiently to incident wave cannot be discovered in such a description. We developed nonquasistatical expressions for the eigenvalues of SPs that includes finding of eigenfrequencies and Q-factor. Using this approach all possible SPs can be found and investigated, including ‘dark’ and multipole ones.Публікація Coupled plasma cylindrical columns as sub-wavelength antenna(КПИ, 2011) Stognii, N. P.; Sakhnenko, N. K.We theoretically study the resonant properties of an aggregate of coupled cylinders filled with negative permittivity plasma. Such a problem has applications in optical and plasma antennas, intelligent antenna systems, and pulse-driven antenna arrays. Chain of columns of plasma can be used in the design of both transmitting and receiving antennas with a very broad frequency range and tunability that allows switching it on and off very fast. The Mie series expansion is used to derive the solution. Electromagnetic analysis of the spectrum of different plasmon resonances is presented.Публікація Coupled plasmon hybrid modes in aggregates of metal nanowires(IEEE, 2015) Stognii, N. P.; Sakhnenko, N. K.Investigation of the plasmonic resonances in aggregates of metal nanowires is presented. Mechanism of plasmonic mode coupling in a system of metal wires that can be considered as hybridization combinations of isolated wire plasmons is investigated.Публікація Eigenvalue problem in a linear chain of coupled infinite-long plasma cylinders(IRE, 2011) Stognii, N. P.; Sakhnenko, N. K.Strong interest in the electromagnetic wave propagation and scattering in the presence of plasma objects is due to the wide range of potential applications of such study. Tuning of resonant characteristics of resonators by free carrier plasma injections can be used in active switches or tunable filters. Transient phenomena in plasma lead to the possibility of the frequency upshifting and the generation of waves. Using resonators composed of negative permittivity materials such as plasma can form the basis of effective small-size antenna elements. The main goal of this paper is to analyze the plasmonic resonances in finite array of plasma coupled cylinders.Публікація Excitation of plasmon resonances on nanowire and nanoshell by complex source point(IEEE, 2016) Stognii, N. P.; Sakhnenko, N. K.Transient pulsed excitation of the localized surface plasmons on nanowire and nanoshell 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 is 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 on the complex plane.Публікація Excitation of surface plasmons by localized transient sources(IEEE, 2016) Stognii, N. P.; Sakhnenko, N. K.Theoretically investigate the excitation of plasmon resonances of metallic nanowires and nanoshell by external transient pulses is presented. To solve the problem, we used a accurate mathematical approach based on the Laplace transform, which allowed us to obtain an analytic representation of the solution. Finding the inverse transformation is based on the assessment of residues at singular points that correspond to the plasmon resonances of our structures.Публікація Fractional-rational representation of the frequency spectrum of the scattered field for a Drude-metal nanowire resonating on localized surface plasmons(IEEE, 2017) Andreev, M. V.; Drobakhin, O. O.; Stognii, N. P.; Sakhnenko, N. K.The paper discusses the problem of determining the eigenfrequencies of surface plasmons for metal nanowire over the frequency spectrum of the scattered field. To determine the eigenfrequencies a fractional-rational approximation of the frequency spectrum based on continued fractions was used. Q-factors for lower and higher modes of the localized surface plasmons are investigated.Публікація Hybrid plasmons in assemblies of coupled metal nanowires(IEEE, 2014) Stognii, N. P.; Sakhnenko, N. K.This paper presents an accurate study of plasmon hybridization in assemblies of coupled metal nanowires. Our modeling provides results in terms of eigenfrequencies and quality factors. For this eigenvalue problem that follows from Maxwell’s equations has been solved. Possibility of quality factor enhancement in optimized assemble configurations has been demonstrated.Публікація Hybridization of plasmons in coupled nanowires(IEEE, 2012) Sakhnenko, N. K.; Stognii, N. P.Theoretical study of plasmon resonant eigenfrequencies in metal nanowires is presented. Mechanism of the plasmonic mode coupling that can be considered as symmetric and antisymmetric combinations of isolated wires plasmons is investigated. Accurate analysis of the spectrum of different plasmon resonances is presented.Публікація Influence of the environment on the coupled metal nanowire plasmon resonances(IRE, 2013) Stognii, N. P.; Sakhnenko, N. K.In this paper we consider the plasmon resonances of single metal nanowire and coupled nanowires embedded in dielectric media with different values of permittivity. Enhancement in sensitivity to environment properties is observable in the cluster with square configurationПублікація Investigation of plasmonic properties of coupled metal wires in the cluster with triangular or square configuration(IEEE, 2014) Stognii, N. P.; Sakhnenko, N. K.This paper presents a theoretical investigation and a straightforward analysis of the plasmonic properties of coupled metal wires in the cluster with triangular or square configuration. Solution of the eigenvalue problem in form of matrix equations is received. Eigenoscillationg frequencies and quality factors of the nanowires of such configurations are studied. Possibility of quality factor enhancement in optimized assemble configurations has been demonstratedПублікація 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 Modeling of transients in cylinder with time varying plasma(IRE, 2010) Stogniy, N. P.; Sakhnenko, N. K.Therefore accurate time domain modeling for investigation of electromagnetic field with time-varying plasma is of great importance. In this paper we investigate the transformation of the incident wave due to change of plasma frequency in the cylinder. The main interest is in the transient response, evaluation of the transition time and the transformed diffraction pattern in the steady state regime. The solution is obtained in a robust mathematical manner. For this we apply the Laplace transform directly to the wave equation and include the initial conditions that involve continuity of the electric field displacement and its derivative at zero moment of time. We generate the analytical solution in the Laplace transform domain in the form of the eigenfunctions expansion that satisfies the boundary conditions requiring continuity of the tangential components of the electric and magnetic field. We obtain the inversion of the image function by virtue of the evaluation of the residues in singular points and integrals along branch cuts of the complex plane.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 Plane wave scattering on chain of silver nanowires(ФНТ, 2011) Stogniy, N. P.; Sakhnenko, N. K.The problem of electromagnetic interaction of two or more closely spaced nanoparticles is of great importance. Such configurations give rise to tunable spectral shifts of the plasmon bands and to exceptionally strong field enhancements. Indeed, the general interest in this field has strongly increased in recent years as improved nanofabrication methods now allow advanced control of nanoparticle shape and arrangement patterns of particle ensembles. In this paper we consider H-polarized plane wave scattering on a linear chain of N identical infinite-long silver cylindrical nanowires. The main goal is to investigate the plasmon resonances of the structure. The Mie series expansion is used to derive the solution. For the refractive index value we use the experimental data obtained by Jonson and Christie for bulk silver.Публікація Plasmon resonances and their guality factors in a finite linear chain of coupled metal wires(IEEE, 2013) Stognii, N. P.; Sakhnenko, N. K.This paper presents a straightforward analysis of the plasmonic properties of metal wires arranged in a linear chain of a finite length. For this we solve eigenvalue problem in form of matrix equations that allow thorough investigation of plasmonic modes with different field distributions. Our modeling provides results in terms of eigen oscillating frequencies and quality factors with controllable accuracy. It has revealed the possibility of quality factor dramatic enhancement for certain plasmonic modes by adjusting the separation distances and increasing the number of wires in a chain.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.