Active mid IR plasmonics using giant magneto resistance

Here we present our proposal and initial results on the magnetic field control of plasmon resonances in the mid IR region by the use of the Magneto-Refractive (MR) effect, i.e., a change in the optical properties of the system by magnetic field controlled electrical resistivity. For this we select a Giant Magneto Resistance model system (a Au/Permalloy multilayer), for which changes in resisitivity of the order of 10% by the application of small (of the order of 20 Oe) magnetic fields have been reported. The experiments are carried out in a dedicated magnetic field FTIR (M-FTIR) spectrometer.We acknowledge financial support from MINECO through project AMES (MAT 2014-58860-P). We also acknowledge the service from MiNa Laboratory at IMM, and funding from CM under project S2013/ICE-2822 (Space-Tec) with support from EU (FEDER, FSE).Peer reviewe