Surface Plasmon Resonances of an Axially Magnetized Plasma Column in the Presence of Collisional Loss
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ATIONS AND WAVES IN PLASMA
Surface Plasmon Resonances of an Axially Magnetized Plasma Column in the Presence of Collisional Loss V. A. Es’kin, A. V. Ivoninsky, and A. V. Kudrin* Nizhny Novgorod State University, Nizhny Novgorod, 603950 Russia *e-mail: [email protected] Received May 26, 2017; in final form, July 14, 2017
Abstract—Surface plasmon resonances arising in the course of scattering of an H-polarized plane electromagnetic wave by an axially magnetized plasma column are analyzed. Main attention is paid to the behavior of these resonances in the presence of collisional loss in the magnetoplasma filling the scatterer. The frequencies, Q factors, and amplitude coefficients of the electromagnetic field of multipole surface plasmon resonances of different orders are found, and conditions under which the collisional loss in the plasma completely suppresses a given resonance are determined. DOI: 10.1134/S1063780X18020034
1. INTRODUCTION In the past decade, the issues of creating RF and microwave plasma antennas and scattering arrays composed of gas-discharge tubes have widely been discussed in the literature (see, e.g., [1–7] and references therein). The application potential of such systems is associated with the possibility to control their electrodynamic characteristics by varying the plasma parameters, in particular, by superposing an external magnetic field. These issues were recently considered in, e.g., [7, 8], where the effect of magnetized cylindrical plasma scatterers located near electromagnetic sources on their radiation characteristics in the RF range was studied. Note that the resonance character of interaction between the source-excited electromagnetic field and the plasma elements of such structures can decisively affect the radiation characteristics of the system as a whole [8], which is of significant interest for various applications. Recall that there are a lot of publications devoted to resonance scattering of electromagnetic waves by cylindrical plasma objects. In particular, quasistatic resonances of a gas-discharge plasma column due to collective oscillations of charged plasma particles both with and without an external magnetic field were studied in [9–12]. In most works, attention was focused on quasistatic dipole resonances in the case where the transverse sizes of the scattering objects were much smaller than the wavelength in the surrounding space, while higher order multipole resonances did not receive sufficient study. Note that, in spite of a considerable number of publications devoted to optical resonances of localized surface plasmons of metal particles (see, e.g., [13–15]), as well as to surface plasmon res-
onances of cylindrical objects filled with metamaterials [16, 17], the problem of such resonances in magnetoplasma, which possesses both anisotropic and gyrotropic properties, has its own specific aspects and, therefore, requires separate analysis. Moreover, to the best of our knowledge, the effect of collisional loss on such resonances in magnetoplasma has not yet been analyzed
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