Log of the intensity of SPs coupling versus the grating wave vector kG for the architecture of Figure 1; at the 0th diffraction order. SP1 is coupled at kx = 7.42 μm-1. SP2 is coupled at kx = 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 kG = ΔSP, shown by the white circles. A cross section of ΛSP at kx = kSP1 is shown in Figure 8.
Lepage et al. Nanoscale Research Letters 2011 6:388 doi:10.1186/1556-276X-6-388