Broadband full-color multichannel hologram with geometric metasurface

Due to the abilities of manipulating the wavefront of light with well-controlled amplitude, phase and polarization, optical metasurfaces are very suitable for optical holography, enabling applications with multiple functionalities and high data capacity. Metasurface hologram has shown a great potential in three-dimensional imaging. Here, we demonstrate encoding two- and three-dimensional full-color holographic images by using ultrathin metasurface hologram and design it by subwavelength nanolists with spatially varying orientations. We further show that it is possible to achieve full-color holographic multiplexing with such kind of geometric metasurfaces, enabled by a synthetic spectrum holographic algorithm. Our results provide an efficient way to design multi-color optical display elements that are ready for fabrication.