Trichromatic and Tripolarization-Channel Holography with Noninterleaved Dielectric Metasurface

TLDR

Metasurfaces promise ultrathin holographic displays with high information capacity, yet conventional dual‑polarization or interleaved designs suffer from polarization crosstalk and efficiency loss that limit their practical use. The study aims to demonstrate a noninterleaved TiO₂ metasurface that encodes three orthogonal polarization phase profiles with negligible crosstalk. The authors design a noninterleaved TiO₂ metasurface that simultaneously encodes three phase profiles into orthogonal polarization bases, achieving near‑zero crosstalk. The resulting trichromatic, tripolarization hologram delivers high‑quality, high‑efficiency vectorial images across the visible spectrum and demonstrates the metasurface’s capability for massive information storage, polarization optics, and holographic encryption.

Abstract

Metasurfaces hold great potentials for advanced holographic display with extraordinary information capacity and pixel sizes in an ultrathin flat profile. A dual-polarization channel to encode two independent phase profiles or spatially multiplexed meta-holography by interleaved metasurfaces are captivated popular solutions to projecting multiplexed and vectorial images. However, the intrinsic limit of orthogonal polarization-channels, their crosstalk due to coupling between meta-atoms, and interleaving-induced degradation of efficiency and reconstructed image quality set great barriers for sophisticated meta-holography from being widely adopted. Here we report a noninterleaved TiO2 metasurface holography, and three distinct phase profiles are encoded into three orthogonal polarization bases with almost zero crosstalk. The corresponding three independently constructed intensity profiles are therefore assigned to trichromatic (RGB) beams, resulting in high-quality and high-efficiency vectorial meta-holography in the whole visible regime. Our strategy presents an unconventionally advanced holographic scheme by synergizing trichromatic colors and tripolarization channels, simply realized with a minimalist noninterleaved metasurface. Our work unlocks the metasurface's potentials on massive information storage, polarization optics, polarimetric imaging, holographic data encryption, etc.