Fig. 1. (a) Illustration of a metasurface composed of silicon nanometer cylinders and fused silica substrate; (b) top view of the metasurface; (c) diagram of transmission and phase difference variation with radius of unit cell.

Fig. 2. (a) Flowcharts of typical G-S algorithm and optimized G-S algorithm; (b), (c) implementation principles of regular dot array and pseudo-random dot array; (d) target light intensity distribution at a distance of 0.5 m; (e), (f) simulated diagrams of normalized light intensity distribution at a distance of 0.5 m generated by the structured light projections based on FFT and generalized R-S diffraction theory.

Fig. 3. (a), (b) Experimental diagrams of light intensity distribution at a distance of 6.5 cm generated by the structured light projections based on FFT and generalized R-S diffraction theory, separately; (c), (d) experimental diagrams of enlarged view of square corner based on FFT and generalized R-S diffraction theory, separately.

Fig. 4. (a) Schematic illustration of fabrication process; (b) top view SEM image of the metasurface; (c) tilted-view SEM image of the metasurface.

Fig. 5. (a) Schematic illustration of the experimental apparatus used to measure the intensity of diffracted beams; (b), (d) experimental diagrams of the 60° FOV metasurface and the 144° FOV metasurface; (c), (e) target diagrams of the 60° FOV metasurface and the 144° FOV metasurface.

Table 1. Comparison with Structured Light Projection Works