We have developed two deep neural networks (inverse network / forward network) for obtaining metasurface operating at visible bandwidth. Unlike other studies, the neural networks involve not only the geometry of the metasurface but also incorporate refractive index information for metasurface designers. With the inverse network, inverse designs of metasurfaces displaying specific spectra have been conducted. Also, using the forward network, we have demonstrated a dual-mode metasurface with a reflective image / transmissive hologram, and an achromatic metalens. The networks provide vast design choices and fast calculation speed for engineers.
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