The Effective Susceptibility Concept in the Electrodynamics of Nano-Systems

The effective susceptibility concept is developed for solution of electrodynamical problems of nano-systems. General principles of introducing effective susceptibility are discussed. The effective susceptibility for different nano-systems, namely, thin films, mesoparticles and quantum dots were calculated. Some examples of effective susceptibility uses were demonstrated. In part, the absorption profiles when inhomogeneous along the thickness thin film absorbs the light, was calculated. Discussed concept was used to show the influence of the shape of nano-partiles covering the surface on dispersion of surface plasmon polaritons. It was shown that proposed approach can be useful for analysis of surface plasmon polarriton resonance experiments. The effective susceptibility concept is useful for modeling of near-field images of linear and nonlinear scanning near-field optical microscopy. The presented method can be applied for modeling of near-field images of different objects. For example, there are pyramid-like quantum dots and semiconductor surface excited by strong focused Gauss-like beam of the light.