Abstract

Metal thin film functionalization with biomolecular recognition elements (BRE), to improve adsorption of biomolecule, is a way for SPR biosensor sensitivity enhancement. In this paper a graphene-based SPR biosensor with wavelength modulation will be presented. A few graphene layers added to a conventional gold thin film SPR biosensor leads to a drastic increase in sensitivity. This is due to the increased biomolecule adsorption in the graphene layers. In comparison to conventional SPR sensors this produces a large change in the index of refraction change at the metal-dielectric interface. In this paper, the reflection of light coupled into a SPR mode propagating along a thin Au-graphene layer surrounded by dielectric layers is simulated and it is compared with a conventional SPR sensor. The simulation of light reflection in wavelength modulation via MATLAB is illustrated.

© 2014 Japan Society of Applied Physics, Optical Society of America