Fig. 5: Cascaded computational metasurfaces.
From: Temporal signal processing with nonlocal optical metasurfaces
a Two similar metasurfaces, each of them performing first-order differentiation, are cascaded. The resulting device performs second-order differentiation. b Response of each metasurface. The input field (red shaded area) is the same as the one used in Fig. 3d. The solid and dashed blue lines show the CCT of the output fields produced by each metasurface separately. c Response of the cascaded system. The solid red line shows the output CCT when the input field impinging on the cascaded arrangement. The dashed green line shows the calculated CCT for the exact second-order derivative of the input field.
