Naked-eye Observable Animation with 3D Metasurface Holograms

In this study, we have achieved a 3D holographic animation observable with the naked eye. The animation is projected using a dielectric waveguide meta-atom made of silicon nitride (SiN), which exhibits high transmittance even in the visible light range. The large size of the metasurface hologram (5.56 square millimeters, $16384 \mathrm{px} \times 16384 \mathrm{px})$ and the prism phase allow for naked-eye observation. By irradiating a laser with a wavelength of 532 nm, holographic animation was successfully projected.