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. 2022 Apr 6;12:5832. doi: 10.1038/s41598-022-09680-1

Figure 4.

Figure 4

Nanofabricated metasurface wafer and optical elements. (a) Wafer-scale nanofabrication of the metasurfaces. (b) Cross-section scanning electron micrograph (SEM) of the engineered grating ridges on the glass wafer. Scale bar: 1 μm. (c) Top-view SEM of the optimized full-color metasurface elements. Scale bar: 5 μm.