Open Access Nano Express

Unusual magneto-optical behavior induced by local dielectric variations under localized surface plasmon excitations

Juan B González-Díaz*, Antonio García-Martín and Gaspar Armelles Reig

Author Affiliations

IMM-Instituto de Microelectrónica de Madrid (CNM-CSIC), Isaac Newton 8, PTM, Tres Cantos, E-28760 Madrid, Spain

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Nanoscale Research Letters 2011, 6:408  doi:10.1186/1556-276X-6-408

Published: 2 June 2011

Abstract

We study the effect of global and local dielectric variations on the polarization conversion rps response of ordered nickel nanowires embedded in an alumina matrix. When considering local changes, we observe a non-monotonous behavior of the rps, its intensity unusually modified far beyond to what it is expected for a monotonous change of the whole refractive index of the embedding medium. This is related to the local redistribution of the electromagnetic field when a localized surface plasmon is excited. This finding may be employed to develop and improve new biosensing magnetoplasmonic devices.