Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 46: MagneticThin Films II
MA 46.4: Talk
Thursday, March 29, 2012, 15:45–16:00, EB 202
Simulations of magneto-optical surface plasmon resonance (MOSPR) effects in Au/Co/Au trilayers for biosensing — •Sebastian Kübler, Kerstin Kämpf, Friedrich Wilhelm Herberg, and Arno Ehresmann — Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel
In the past years it has been shown that it is possible to improve the sensitivity of biosensors based on the surface plasmon resonance (SPR) effect by the combination of the SPR effect with the transverse magneto-optic Kerr effect (tMOKE). The magneto-optic SPR (MOSPR) of Au/Co/Au trilayer systems in transverse configuration for the dielectric layers air (n=1) and water (n=1.33) was simulated. The normalized difference of the reflectivity R(H+) and R(H−) (δ-signal) shows a strong thickness dependence. The magnitude of the δ-signal changes with the refractive index n of the dielectric layer. In order to mimic realistic biosensor conditions the δ-signal of a Au(10.75 nm)/Co(6 nm)/Au(20.25 nm) trilayer was calculated and compared with the reflectivity of a 50 nm Au layer within the typical refractive index range (n=1.33−1.4) of commercial SPR sensors. In this range the amplitude of the resulting δ-signal decreased by a factor of ∼ 64. For a refractive index change of 10−2 the δ-signal stays in the same order of magnitude. This finding demonstrates the essential need of defined metal layer thicknesses for distinct refractive index regions to exploit the sensitivity of an MOSPR based biosensor.