A 3-D multilayer model of scattering by nanostructures. Application to the optimisation of thin coated nano-sources

A multilayer model is applied to near field optical nano-sources. This model is based on the resolution of the Maxwell equations fitting specific boundary conditions. Because of the thin metal coating at the end of a sort of nano-source, a perturbative approach is suitable. The first part will describe the 3D multilayer theory and algorithm, the second part will introduce geometrical considerations on the metal coating of the optical fiber in order to discuss on nano-source coating. The benefit of this model is the interpretation of the phenomenon with the help of spatial Fourier spectrum of the source.