Enhanced magneto-optical Faraday effect in two-dimensional magnetoplasmonic structures caused by orthogonal plasmonic oscillations
Denis M. Krichevsky, A. N. Kalish, M. A. Kozhaev, D.A. Sylgacheva, A. N. Kuzmichev, Sarkis A. Dagesyan, Venu Gopal Achanta, E. Popova, N. Keller, V. I. Belotelov
Abstract
We report the enhancement of the magneto-optical Faraday effect in a two-dimensional magnetoplasmonic grating with a square lattice. The structure consists of dielectric magnetic Bi-substituted iron garnet film with low thickness (100 nm) coated by a perforated gold layer. Enhancement of the Faraday rotation by about 2 times is shown experimentally and theoretically despite the suppression of the waveguiding modes. This happens primarily through excitation of surface plasmon polaritons propagating at the Au-garnet interface in two orthogonal directions along lattice vectors of the plasmonic grating.