Fig. 2 |. Meta-optic architecture.

a, Comparison between the digital and optical convolution process. A random 3 × 3 kernel, normalized within [−1, 1], was defined to digitally convolve an image. The equivalent optical PSF was designed and simulated by the angular spectrum propagation method, with the optical output calculated based on the premise of a coma-free system. b, Architecture of the compound meta-optic forms three independent focal spots as the PSF. Angular multiplexing is used in the first layer of the metasurface, which can split light into multiple signal channels and correct the wavefront for wide-view-angle imaging. Meanwhile, polarization multiplexing is used to realize an independent response for orthogonal-polarization states. In our case, RCP and LCP signals are used for the positive and negative kernel values, respectively.