Magneto-optical surface plasmon resonance structures

We analyzed for different periodicity and golden films thicknesses the reflectance and Kerr magneto-optical parameters of applied periodical dot sandwich structure. The dot thickness has been fixed to 20 nm, the incidence 632.8 nm laser beam with p-polarized light was used. The results show the sharp reflectance extrema as function of incidence angle. This dependance is importantly modified by Au film thickness. The influence of magneto-optical activity of Fe 2D grating has been studied by Kerr effect in longitudinal configuration. Through the extension of the Yeh´s formalism to magnetic crystalline media the magneto-optic formulae in layered structures with magnetic ordering were obtained. The reflectivity was calculated by rigorous coupled wave algorithm (RCWA) implemented in own Matlab code. The maximum of rotation achieves to 4 mdeg, the extreme ellipticity value is about 3 mdeg. These results offer new approaches for MO surface plasmon resonance sensing elements.