Aufsatz in einer Fachzeitschrift
Magneto-optic surface plasmon resonance optimum layers: Simulations for biological relevant refractive index changes
Details zur Publikation
Autor(inn)en: | Kämpf, K.; Kübler, S.; Herberg, F.; Ehresmann, A. |
Publikationsjahr: | 2012 |
Zeitschrift: | Journal of Applied Physics |
Seitenbereich: | 034505 |
Jahrgang/Band : | 112 |
ISSN: | 0021-8979 |
DOI-Link der Erstveröffentlichung: |
URN / URL: |
Zusammenfassung, Abstract
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 indexn 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.
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 indexn 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.
