Spatial Dispersion Engineering using Cascaded Local Metasurfaces

Spatially dispersive or nonlocal metasurfaces have gained much attention in the literature due to their promising applications in wave based computing. These surfaces can be characterized with surface susceptibilities that vary as a function of the transverse wavevector. Recently a method has been proposed that generates the nonlocal susceptibilities required to achieve some desired angular scattering response. However, the physical realization of these susceptibilities remains an open problem. In this work, we demonstrate a simple method to realize a spatially dispersive response using cascading non-spatially dispersive metasurfaces. This reduces the problem of realizing a spatially dispersive surface to the much more familiar problem of realizing a non-spatially dispersive surface.