Telecommunications and Radio Engineering, 75 (15):1355-1367 (2016) 0040-2508/16/$35.00 ©2016 by Begell House, Inc. 1355 SOLID-STATE AND PLASMA RADIO PHYSICS PLASMON IMAGING USING THE UMOV- POYNTING VECTOR * E.A. Velichko  & A.P. Nickolaenko O.Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkiv 61085, Ukraine Address all correspondence to E.A. Velichko E-mail: elena.vel80@gmail.com The cylindrical sensors out of noble metals that exploit the plasmon surface resonance are widely used in the bio-medical research and environmental explorations, so that studying their characteristics in different wavelength bands is an actual task. We analyze the scattering of a plane H-polarized electromagnetic wave in the visible range of wavelengths by a silver nano- cylinder with a concentric dielectric coating. The arising plasmon resonances are treated using both the conventional presentation of the spatial distribution of the field amplitude nearby the object and by the spatial distribution of the Umov-Poynting vector. We demonstrate that plasmon description by the Umov-Poynting vector has obvious advantages, as the standing and the traveling waves become clearly visible together with the boundaries of the object outlined in the spatial distribution. Unusual influence of the coating permittivity on the type of the plasmon resonance and the relevant spatial field distribution is illustrated when a decrease of the coating dielectric constant supports the quadruple hybrid resonance instead of the dipole plasmon resonance. KEY WORDS: electromagnetic wave scattering, plasmon resonance, Umov- Poynting vector 1. INTRODUCTION Plasmons are the surface waves associated with the vacuum-metal boundary, which arise when the real part of dielectric constant of the metal is negative [1-8]. Permittivity of noble metals in the optical range was described in many papers by the Drude formula           i p    2 1 where  is the circular frequency of the incident electromagnetic wave,  p is the effective plasma frequency, and  is the effective collision frequency of the charge carriers in the metal. The condition is held * Originally published in Radiophysics and Electronics, Vol. 7(21), No 2, 2016, pp. 79–86.