Chepok A. Influence of metallic nanoparticles on the optical and photoelectric properties of Solids.

The object of the research is metallic spherical nanoparticles both individual and embedded into non-metallic Solids. The aim of the research is investigation of influence of metallic nanoparticles on the optical and photoelectric properties of Solids. The novelty of the research consists of the following items: the spectrum of plasmons is determined for both surface- and volume-type excitations and their mutual connections. It is demonstrated that only surface plasmons of dipole-type can be excited by homogeneous dynamical electric field; the Lorentz friction due to irradiation of electromagnetic wave by plasmon oscillations is analyzed with respect to the sphere dimension; the resulting shift in resonance frequency turns out to be strongly sensitive to the sphere radius; the form of electromagnetic e-m response of the system of metallic nanospheres embedded in the dielectric medium is found. Wave-type collective oscillations of surface plasmons in long chains of metallic nanospheres are described. The undamped region for collective plasmon propagation along the metallic chain is found in agreement with previous numerical simulations. The damping-caused plasmon resonance shifts are compared with the experimental data for metallic nanoparticles of different sizes located in a dielectric medium or on the emiconductor substrate. The strong enhancement of energy transfer from the surface plasmon oscillations to the semiconductor substrate is explained in the regime of a near-field coupling of surface plasmons with semiconductor electrons in agreement with recent experimental observations for metallically surface-nanomodified photo-diode systems. The degree of the approval is high. The corresponding branches are Physics of Solids, institute of higher education.