Plasmon-enhanced magneto-optical activity in a nanostructure with circle annular arrays

The optical properties and magneto-optical (MO) activity in a bilayer nanostructure consisting of a ferromagnetic dielectric film and a noble metal film perforated with circle annular arrays are investigated. Enhanced Faraday rotation peaks with opposite signs are found. Meanwhile, enhanced polar Kerr rotation with large reflectance is also obtained at the same wavelength. The peak positions of the MO rotations accompanied by large transmittance and reflectance can be efficiently tailored by changing the geometrical parameters and the filling medium. These findings are important for applications in highly integrated upto electronics and multiple channel magneto-optical devices.National Key Project of Fundamental Research of China (2012CB932304); National Natural Science Foundation of China (NSFC) (11374146, U1232210).Peer Reviewe