Itinerant versus localized plasmons in an assembly of metal-dielectric parallel flat slabs in the presence of a perpendicular magnetic field: Faraday and magneto-optical Kerr effects

The influence of the surface running and surface localized plasmons on the optical properties (including Faraday and magneto-optical Kerr effects) is studied and compared for homogeneous as well as perforated metal-dielectric, sandwichlike structures. Closed-form exact expressions are derived for the macroscopic permittivity tensor of an assembly of metal-dielectric parallel flat slabs in the presence of an externally applied static magnetic field perpendicular to the slab plane. The structure-dependent resonance associated with running surface plasmon appears only in the perpendicular to the surface zz macroscopic permittivity tensor component and does not depend on the perpendicularly applied magnetic field. The other diagonal tensor components vanish at the so-called "hybrid cyclotron-plasma frequency,"which depends on the slab thickness and the applied magnetic field. All analytical results are verified by numerical simulations.