Mishakova T. Ellipsometry of semiconductor planar nanostructures with taking into account of the near field effects

This thesis is devoted to the development of the self-consistent theory of the response of a sub-monolayer of interacting nano-particles by Green's function method. The Lipman-Schwinger equation with the Green's function of a half-space is solved in 2D k-space for the determination of the averaged response of nano-particles constituting the layer on a surface. On the base of this approach we developed the model of the optical response of the layer of nanoparticles randomly distributed on a surface. The direct electromagnetic interaction between particles was taken into account in this model by the Lipman-Shwinger equation. We made ellipsometric measurements for samples with layers of gold nanoparticles of different parameters. It was experimentally shown that the standard models of the effective medium approximation can't correctly describe the behavior of spectra. It was clearly demonstrated that experimental spectra strongly depend of the geometrical parameters of particles. On the base of this model, which takes into account the interaction between particles, we can calculate the sensitivity of optical sensors on local palsmons and find optimal parameters to increase their sensitivity.