Faraday effect enhancement in metal-dielectric plasmonic systems

摘要

Magnetooptical effects in the metal/dielectric heterostructure, consisting of a thin metallic layer with the array of parallel subwavelength slits and a uniform dielectric layer magnetized perpendicular to its plane, are investigated. Calculations, based on the rigorous coupled-wave analysis of Maxwell's equations, demonstrate that in such structures the Faraday and Kerr rotation can be significantly enhanced in the near infrared optical range. It is possible by varying thickness of the magnetic film to make Faraday rotation and transmittance peaks coincident and achieve the increase in the Faraday effect by more than an order of magnitude at the transmittance of 40-45%. It is shown that the excitation of the surface plasmon polaritons and quasi-guided TM- and TE- modes in the dielectric layer mostly governs the enhancement of the Faraday rotation.