Figure 5: Normalized cross-sections on an asymmetric superlens.

(a) Depicts experimental data, and (b) shows the results from numerical simulations (for details see text). The horizontal range in all cross-sections is 12 μm (scale bars, 6 μm). The topography of the sample and the position of the SrRuO₃ object is reflected by the dark areas at the bottom of the figures. The localized evanescent fields on the objects show a maximum at a certain distance z₀, which increases with smaller wavelength. This effect is observed experimentally as well as in the simulations and corresponds to a superlens-enhanced coupling of probe and object. (c,d) Spectral behaviour of the near-field maxima in the experiment (c) and in the simulations (d) for areas with (red) and without (green) objects as well as the corresponding contrast V (yellow) calculated from this data. The marked areas correspond to the observation of non-localized near-field signals (green), and localized evanescent fields due to the superlensing effect (red).