Magneto-optical response in bimetallic metamaterials
  We demonstrate resonant Faraday polarization rotation in plasmonic arrays of bimetallic nano-ring resonators consisting of Au and Ni sections. This metamaterial design allows to optimize the trade-off between the enhancement of magneto-optical effects and plasmonic dissipation. Although Ni sections correspond to as little as ~6% of the total surface of the metamaterial, the resulting magneto-optically induced polarization rotation is equal to that of a continuous film. Such bimetallic metamaterials can be used in compact magnetic sensors, active plasmonic components and integrated photonic circuits. 
Evangelos Atmatzakis, Nikitas Papasimakis, Vassili Fedotov, Guillaume   Vienne, Nikolay I. Zheludev
physics.optics