Method for Magnetooptical Modulation of Light Using Surface Plasmons

Method of modulating light includes forming a magnetoplasmon crystal based on a periodically nanostructured dielectric array with a spatial period d, sputtering thereon layers of ferromagnetic and noble metals, as well as dielectrics, illuminating the magnetoplasmon crystal with light and applying a magnetic field. Modulation of the intensity of TM polarised reflected light is carried out using a periodically nanostructured film of ferromagnetic metal with thickness h=50-200 nm. The light source used is TM polarised electromagnetic radiation which falls on the surface of the magnetoplasmon crystal at an angle which corresponds to excitation of surface plasmon polaritons. An alternating magnetic field is applied in the form of equatorial Kerr effect.