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Metasurface-generated holography has emerged as a promising route for fullyreproducing vivid scenes by manipulating the optical properties of light usingultra-compact devices. However, achieving multiple holographic images using asingle metasurface is still difficult due to the capacity limit of a singlemeta-atom. In this work, we present an inverse design method based ongradient-descent optimization to encode multiple pieces of holographicinformation into a single metasurface. The proposed method allows the inversedesign of single-celled metasurfaces without the need for complex meta-atomdesign strategies, facilitating high-throughput fabrication using broadband lowloss materials. By exploiting the proposed design method, both multiplane RGBcolor holograms and 3D holograms are designed and experimentally demonstrated.Up to eighteen distinct metasurface-generated holographic images aredemonstrated, achieving the state-of-the-art data capacity of a singlephase-only metasurface. To the best of our knowledge, we present the firstexperimental demonstration of metasurface-generated 3D holograms that havecompletely independent and distinct images in each plane. By demonstrating thehigh-density holographic information of a single metasurface, the currentresearch findings provide a viable route for practical metasurfaces-generatedholography, ultimately stepping towards applications in optical storage,displays, and full-color imaging.

Multicolor and 3D holography realized by inverse design of single-celled metasurfaces