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Schematic diagrams of several basic configurations for sing-chip wide-angle metalenses. The red and blue lines represent the light rays with different incidence angles.
(A) Optimized multi-parametric geometries. (B) Monolayer quadratic metalens. (C) Landscape quadratic metalens using an air gap. (D) Landscape quadratic metalens using a dielectric gap. (E) Metalens doublets.
