Tsykhonia A. Near-field effects on the optical properties of nano-systems

In the work a method for investigation of resonance electrodynamical properties of nano-composite systems is developed. This method is based on an analytical solution of the Lippmann-Schwinger equation in the frame of effective susceptibility concept. In the work the influence of inhomogeneous field of a mesoparticle on the optical properties of a quantum dot was studied. It was shown, that when the mesoparticle permittivity is static, the interaction between particles leads to the shifting of the absorption peak and changing of the absorption intensity. But in the resonance case, the interaction results in the splitting of the absorption curve. It was also found that interaction between surface plasmon-polaritons and ellipsoidal particles can lead to appearance of the s-polarized surface waves, to appearance of new branches in the spectrum of p-polarized surface waves. Dispersion relations strongly depend on the shape, concentration and material properties of the particles. In the presented work, it was shown the possibility of the surface plasmon-polariton amplification by direct current in the domain of small wavevectors that can be reached in the experiments. The phase synchronism region can be shifted into the required region of wavevectors due to surface wave scattering on the periodical structure of particles. The effect of stimulated amplification of the surface plasmon-polaritons is also presented in the work.