In Advanced materials (Deerfield Beach, Fla.)
Metasurface-generated holography has emerged as a promising route for fully reproducing vivid scenes by manipulating the optical properties of light using ultra-compact devices. However, achieving multiple holographic images using a single metasurface is still difficult due to the capacity limit of a single meta-atom. In this work, we present an inverse design method based on gradient-descent optimization to encode multiple pieces of holographic information into a single metasurface. The proposed method allows the inverse design of single-cell metasurfaces without the need for complex meta-atom design strategies, facilitating high-throughput fabrication using broadband low-loss materials. By exploiting the proposed design method, both multiplane RGB color and 3D holograms are designed and experimentally demonstrated. We achieve multiplane RGB color holograms with nine distinct holograms, demonstrating the state-of-the-art data capacity of a phase-only metasurface. We also present the first experimental demonstration of metasurface-generated 3D holograms with completely independent and distinct images in each plane. The current research findings provide a viable route for practical metasurface-generated holography by demonstrating the high-density holography produced by a single metasurface. It is expected to ultimately lead to optical storage, display, and full-color imaging applications. This article is protected by copyright. All rights reserved.
So Sunae, Kim Joohoon, Badloe Trevon, Lee Chihun, Yang Younghwan, Kang Hyunjung, Rho Junsuk
2022-Dec-27
holography, inverse design, metasurface, multi-color, three-dimensional
