Fig. 4: Metasurface efficiency versus input bandwidth.
From: Temporal signal processing with nonlocal optical metasurfaces
a–f Experimental measurements of the metasurface response for input pulses with different bandwidths. In each panel, the left sub-panel shows the frequency spectrum of the input pulse (red-shaded area) and the filtered pulse (blue solid line). The right sub-panel shows the corresponding CCTs. g Computational efficiency, defined as the ratio between the energies of the output and input pulses, versus the bandwidth of the input pulse, extracted for the experimental data (solid blue line) and calculated for an ideal differentiator with the same bandwidth as our metasurface. h Absolute value of the transfer function in the experiment (solid blue line), compared to the transfer function of an ideal differentiator with a bandwidth of 6 THz (dashed red line). See text for additional details.
