Fig. 1. Schematic diagram of (a) computational ghost imaging and (b) single-pixel imaging

Fig. 2. Several research demonstrations of metasurface imaging technology in optical and microwave regime ^[58-64]

Fig. 3. Metasurface imaging as target image. (a) Schematic diagram of experimental setup; (b) Schematic diagram of unit cell of the metasurface; (c) Scanning electron microscopy image of the metasurface; (d) Schematic diagram of reflective metasurface hologram with LCP and RCP; (e) Simulated results with different GI algorithms; (f) Experimental results with different GI algorithms; (g) Scheme of the optical encryption based on CGI with helicity-dependent metasurface hologram ^[65]

Fig. 4. Schematic diagram of metasurface imaging as patterns to reconstruct target images ^[67]

Fig. 5. Schematic diagram of dynamic pattern generation based on metasurface imaging Meta-image 3 and corresponding optical encryption ^[67]

Fig. 6. (a) Structural diagram of 1D resonant metamaterial apertures for compressed imaging; (b) Reconstructions of different static scenes^[77]; (c) Imaging system consisting of dynamic metasurface antennas; (d) Schematic diagram of the dynamic metasurface antennas and the exciting signals^[79]

Fig. 7. (a) Scheme of phaseless computational ghost imaging at microwave frequencies using DMA; (b) Structured illumination patterns generated by a DMA^[81]; (c) Schematic illustration of DMA to achieve incoherent CGI; (d) Reciprocal images of two targets obtained by averaging over receiver tuning states on the left, transmitter tuning states on the right, and the product of them^[82]