Magneto-optic surface plasmon resonance optimum layers: Simulations for biological relevant refractive index changes

The transfer matrix method is used to simulate the magneto-optic surface plasmon resonance (MOSPR) of Au/Co/Au trilayer systems focused on the magneto-optic activity in transverse configuration. The results show a strong thickness dependence of the normalized difference of reflectivity at opposite d...

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Bibliographic Details
Published in:Journal of applied physics 2012-08, Vol.112 (3)
Main Authors: Kämpf, Kerstin, Kübler, Sebastian, Wilhelm Herberg, Friedrich, Ehresmann, Arno
Format: Article
Language:English
Subjects:
Biological effects
Biosensors
Cobalt
Gold
Plasmons
Refractive index
Refractivity
Simulation
Surface chemistry
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Summary:The transfer matrix method is used to simulate the magneto-optic surface plasmon resonance (MOSPR) of Au/Co/Au trilayer systems focused on the magneto-optic activity in transverse configuration. The results show a strong thickness dependence of the normalized difference of reflectivity at opposite directions of the magnetization (δ-signal) and a strong change of the δ-signal with the refractive index n of the biologically active layer. Within a range of the refractive index typically covered by a commercial SPR biosensor (n=1.33-1.40), the magnitude of the δ-signal of an Au(10.75 nm)/Co(6 nm)/Au(20.25 nm) trilayer decreases from small to large n by a factor >63. This finding demonstrates that the enhanced sensitivity of an MOSPR biosensor can be exploited only by defined thicknesses of the metal layers for distinct refractive index regions.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4742130