Plasmon-enhanced magneto-optical activity in ferromagnetic membranes

González-Díaz, J. B.; García-Martín, J. M.; García-Martín, A.; Navas, D.; Asenjo, A.; Vázquez, M.; Hernández-Vélez, M.; Armelles, G.
June 2009
Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p263101
Academic Journal
Experimental and theoretical evidence of plasmon-enhanced Kerr rotation in purely ferromagnetic membranes with sufficiently small dimensions to be out of extraordinary optical transmission conditions (45 nm pore diameter, 90nm lattice constant), is reported in this work. It is shown that the spectral location of the enhanced Kerr rotation region varies as the refractive index of the material inside the pore is modified. A similar behavior is obtained if the pore radius changes while keeping the pore concentration unchanged. Those are clear signatures indicating that localized surface plasmon resonances propagating along the pores govern the magneto-optical response of the membrane.


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