Figure 10
From: Global optimization of metasurface designs using statistical learning methods
Comparison between the classical approach to phase gradient metasurface design and our optimized geometries for the cylindrical nanopillars with h = 800 nm. (a,b) The geometry obtained using the classical approach in which each nanopillar is optimized manually by changing the diameter and finally placed together in order to obtain the desired phase shift needed to maximize the light deflection for the first order mode at λ = 600 nm with period 1500 nm in y-direction. (c) Results obtained using the CMA-ES for the cylindrical nanopillars (see Table 3) for the corresponding parameters. (c) Comparison between the deflection efficiency for the first order mode obtained using the classical (red curve) and the CMA-ES (orange curve). (d,e) Represent field maps of \(\Re e({E}_{y})\) obtained using the classical optimization design and the CMA-ES results, respectively.
