Multicolor and 3D Holography Generated by Inverse-Designed Single-Cell Metasurfaces.

Area of Science:

• Optics and Photonics
• Materials Science
• Computational Electromagnetics

Background:

• Metasurface holography offers compact devices for vivid scene reproduction.
• Limited capacity of individual meta-atoms hinders multiple holographic images from a single metasurface.

Purpose of the Study:

• To develop an inverse design method for encoding multiple holographic information into a single metasurface.
• To overcome the capacity limitations of single meta-atoms in metasurface holography.

Main Methods:

• Utilized gradient-descent optimization for inverse design of single-cell metasurfaces.
• Employed broadband, low-loss materials for high-throughput fabrication.
• Designed and experimentally demonstrated multiplane RGB color and 3D holograms.

Main Results:

• Achieved multiplane RGB color holograms with nine distinct images, showcasing state-of-the-art data capacity for phase-only metasurfaces.
• Presented the first experimental demonstration of metasurface-generated 3D holograms with independent images in each plane.
• Validated a high-density holography approach using a single metasurface.

Conclusions:

• The proposed inverse design method facilitates practical metasurface-generated holography.
• Demonstrated high-density holographic data storage and display capabilities.
• Opens avenues for applications in optical storage, advanced displays, and full-color imaging.