Dynamic Bifunctional Metasurfaces for Holography and Color Display

Metasurfaces have shown their unprecedented ability in wavefront shaping and triggered various applications with state‐of‐the‐art performances, e.g., color nanoprinting and metaholograms. Recently, these two functions have been combined into a single metasurface to further expand its capabilities. Despite the progress, the current dual‐mode metasurfaces are mostly static and strongly hinder their practical applications. Herein, the realization of dynamic bifunctional metasurfaces is reported. Five metaholograms at two different wavelengths are multiplexed with structural colors by controlling the spectral and phase response of metasurface. Owing to the destructive interference and the resonance on external environment, the light diffraction at particular wavelengths can be switched between “ON” and “OFF” states, or remain unchanged with the change of surrounding refractive index. Consequently, the encoded metaholograms are selectively turned on and off, making the overall holographic image dynamically switchable. This concept paves a solid step toward practical applications of all‐dielectric metasurfaces. A dynamic bifunctional metasurface for color nanoprinting and metaholograms is numerically and experimentally realized. Metaholograms are multiplexed with structural colors by controlling the spectral and phase response of the metasurface. The light diffraction can be switched between the “ON” and “OFF” states, or remain unchanged for different wavelength with the infiltration of the dimethyl sulfoxide (DMSO) solution, making the colorful holographic images dynamically switchable.