Figure 7
From: Plasmonic propagations distances for interferometric surface plasmon resonance biosensing
Log of the intensity of SPs coupling versus the grating wave vector k G for the architecture of Figure 1; at the 0th diffraction order. SP1 is coupled at k x = 7.42 μm-1. SP2 is coupled at k x = 11.48 μm-1 and weakly perturbed by the surface changes. Lines of SPs coupling though the grating are visible. Coupling through the ±1st diffraction order is highlighted by the semi-transparent lines. Higher orders of diffraction and coupling (parallel and anti-parallel) are visible in the graph (±2nd, ±3rd, etc), but are not underlined for clarity purposes. A practical application for ΛSP is found at k G = ΔSP, shown by the white circles. A cross section of ΛSP at k x = k SP1 is shown in Figure 8.