Classical and Quantum Surface Plasmon Resonance Biosensing

Figure 5

We see a shift/drift to the right in the position of the angle dip as the index of refraction of the analyte on the gold surface changes. The orange curve represents the curve obtained when the index of refraction of the analyte is 1.39 but as it changes to 1.4 a new curve is obtained, that is, the red curve is obtained and a new resonance dip position is established. The dip position is altered by changing the index of refraction of the dielectric on the gold surface. This shift is called the angular shift and corresponds to the change in refractive index. This figure was generated in Mathematica programming language using details from an example figure in reference [42].