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. Author manuscript; available in PMC: 2010 Aug 1.
Published in final edited form as: Anal Chem. 2009 Aug 1;81(15):6429–6437. doi: 10.1021/ac900807q

Figure 7.

Figure 7

SPR sensitivities were calculated for a 7.5 amorphous carbon layer over a variety of gold or silver thicknesses. (a) Scanning angle SPR reflectivity curves were calculated using n-phase Fresnel equations for carbon-on-metal substrates with 25 – 65nm of silver or gold under a 7.5nm amorphous carbon layer when exposed to a 0% and 1% (w/v) ethanol solution. The change in solutions corresponds to an index of refraction change (Δnf) of 0.0006. (b) The difference between reflectivity curves results in a plot of the change in reflectivity (Δ%R) as a function of angle. (c) Graph of the Δ%R attainable for various thicknesses of gold (●) and silver (■).