Fig. 13
From: Planar metasurface-based concentrators for solar energy harvest: from theory to engineering
Characterization of the meta-lens fabricated on a 12-in. glass wafer: (I) Color images of the fabricated 12-in. glass wafer and the central die in the wafer, with highlighted areas indicating the meta-lens. SEM images were obtained at the central (II), near-central (III), and outer zones (IV) of the meta-lens. Measured optical intensity of the meta-lens at the optical propagation plane (V) and the focal plane (VI). (VII) Horizontal cut of the focal spot is shown in (VI). Reproduced with permission [225]. Copyright 2020, published by De Gruyter