Au/Fe/Au multilayer transducers for magneto-optic surface plasmon resonance sensing

6 páginas, 5 figuras.In this paper, we analyze the magnetoplasmonic (MP) features and sensing capabilities of Au/Fe/Au trilayer structures, as transducers of the magneto-optic surface plasmon resonance (MOSPR) biosensor. This biosensor, which can surpass the sensitivity of the standard SPR sensor, is based on a MP modulation technique generated by the simultaneous stimulation of the surface plasmon polaritons (SPP) and the transversal magneto-optical Kerr effect (TMOKE). We study the magneto-optical activity of the trilayers as a function of the thickness and position of the Fe layer. We first demonstrate that this kind of structure allows modulating the SPP through an external magnetic field and moreover, induce a strong enhancement of the TMOKE effect. The modulation of the SPP is linearly proportional to the thickness of Fe layer and inversely proportional to the distance between the Fe layer and the external dielectric medium. Finally, we experimentally confirm a twofold increase in the MOSPR sensitivity with respect to the intensity-interrogated SPR biosensor in bulk refractive-index changes, keeping a similar chemical resistance and stability, unprecedented in other MP transducers, and biofunctionalization protocols.Financial support is acknowledged from: FUNCOAT, MICINN Consolider Ingenio 2010 under Project No. CSD2008-00023; MAGPLAS MICINN under Project No. MAT2008-06765-C02-01/NAN; MICROSERES CAM under Project No. S2009/TIC-1476; and M. Botín Foundation. David Regatos acknowledges financial support from “Programa de Formación de Investigadores del Departamento de Educación, Universidades e Investigación” of the Gobierno Vasco (Spain). B. Sepulveda acknowledges the financial support from the Ramon y Cajal program from MICINN.Peer reviewe