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The relations for the polarizability of the metallic nanoparticles, coatedwith the shell of cyanine dyes, are obtained in the article. The frequencydependencies for light absorption and scattering efficiencies, the heating ofthe composite nanoparticle and the electric field amplification in itsneighborhood are studied. It is established that all the dependencies havethree maxima which correspond to the frequencies of hybrid plasmon-excitonresonance. It is shown that an increase in content of metal in the nanoparticlecauses a blue shift of the maxima from the visible part of the spectrum and ared shift of the maximum from ultraviolet frequency range. The issue ofapplication of metal-organic nanoparticles in nanomedicine, in particular forthe photothermal therapy of malignant neoplasms is studied.

Optical and thermal effects in the neighborhood of the spherical layered nanoparticle of the "metallic core -- J-aggregate shell'' structure