Figure 3. Near-field maps for different excitation schemes.

Time-evolution of the longitudinal magnetic field component Re(H_z) plotted in a plane parallel to the xy-plane cutting through the centers of all particles for two different excitation schemes and a fixed wavelength of 520 nm. (a) Excitation with an x-polarized Gaussian light beam. (b) Excitation with a y-polarized Gaussian light beam. Each field map is normalized to its individual minima and maxima resulting in different colour-scales for different maps. The geometrical outlines of the three nanosdisks (top: Au; bottom: Si) are indicated by black circles. For right-handed (left-handed) circularly polarized excitation, the frames indicated in blue in a and green (red) in b overlap temporally.