On‐Chip‐Driven Multicolor 3D Meta‐Display

Abstract

AbstractIntegrating metasurfaces on‐chip provides a promising approach to modulating and extracting the in‐plane waves, which bridges the conversion between guided and free‐space waves and suggests tremendous applications, including guided‐wave‐driven holography, photonic integrated lasers, and on‐chip routers. However, despite these efforts, it remains challenging to achieve multicolor 3D holographic projections via on‐chip meta‐optics, along with switchability. Here, the multicolor 3D holography free from zero‐order diffraction and the immersion switchable display enabled by the on‐chip integrated metasurface is proposed and demonstrated. By leveraging the propagation‐accumulated phase of the guided waves and exploiting an optimization algorithm, an on‐chip meta‐hologram driven by guided waves is developed to project both multicolor and multiplane images with independent encoding freedom. Moreover, the switch between two colorful holographic images is also demonstrated via an easily accessible immersion tuning scheme. Such an on‐chip‐driven meta‐hologram exhibits low background noise or crosstalk with high information quality and is also free from sophisticated nanostructure searching or elaborate target‐image predesigning. The proposed on‐chip‐driven metasurface for multicolor 3D holography promises future applications in dynamic display, virtual/augmented reality, and liquid sensing.