Classical and Quantum Surface Plasmon Resonance Biosensing

Figure 12

(a) An experimental setup used for SPR biosensing. Before striking the prism with the gold slide, a 785 nm unpolarized laser beam passes through two half-wave plates, a PBS, and then excites the surface plasmons at the metal-air interface. A CCD camera is used to capture the prism’s reflected light. There is a flow cell on top of the gold layer that contains the analyte of interest. (b) A modified version of the SPR setup; it is modified in that the light source is no longer a laser but a single-photon source (SPDC source). This is an experimental example of single-photon plasmonic sensing from an SPDC source. In this case, the detectors will be single-photon detectors. The detectors measure coincidences and counts of single photons. This was taken from reference [40].

(a)

(b)