  The relations for the polarizability of the metallic nanoparticles, coated
with the shell of cyanine dyes, are obtained in the article. The frequency
dependencies for light absorption and scattering efficiencies, the heating of
the composite nanoparticle and the electric field amplification in its
neighborhood are studied. It is established that all the dependencies have
three maxima which correspond to the frequencies of hybrid plasmon-exciton
resonance. It is shown that an increase in content of metal in the nanoparticle
causes a blue shift of the maxima from the visible part of the spectrum and a
red shift of the maximum from ultraviolet frequency range. The issue of
application of metal-organic nanoparticles in nanomedicine, in particular for
the photothermal therapy of malignant neoplasms is studied.
