Figure 4. Measured and simulated cloaking performance.

Measured (a) and simulated (b) scattering cross section of the core object with (blue solid) and without the cloaking silver nanoparticle shell (red dashed) are shown on top. The inset in (b) shows the structure as considered in the simulation. The gray shaded areas mark the wavelength domain where the borosilicate substrate absorbs. Since the substrate is disregarded in simulations the experimental and simulated curves show different dependencies inside the gray shaded area. The measured (c) and simulated (d) scattering efficiencies are shown at the bottom. Different scaling for the scattering efficiency has been used for measurement and simulation. Although the functional dependency is perfectly reproduced, the cloaking efficiency (inverse of scattering efficiency) is enhanced in the simulations; a deviation that is attributed to the fact that the measurement is an ensemble average whereas the simulation corresponds to a single structure.