Light scattering by supported metallic nanostructures: Polarization and spectroscopy in the near-field zone

We show in this paper, the analysis of polarization around nanoscopic objects in the near-field optics. The objects are illuminated through a transparent glass substrate under the condition of total internal reflection. The use of metallic materials (Al, Au) is discussed in the optical images. Using numerical simulations based on the Green's dyadic technique, we compute the total transmitted intensity of the scattered light and the different cartesian components associated to the electric field in the Attenuated Total Reflection configuration at constant height. The role of localized plasmon resonance is brought to the fore in the optical images for nanoscopic metallic objects (Au). This paper shows that it is possible to reduce the interferences due to the backward scattering on nanoscopic objects thanks to this analysis of polarization.