Broadband Complex Amplitude-Modulated Metasurfaces for Nanoprinting and Vectorial Hologram with Continuously Varying Linear Polarization Distributions

Abstract

The multi-dimensional light-field manipulation capability of metasurfaces positions them as promising candidates for displaying nanoprinting and holographic images at ultra-short distances with subwavelength resolution. In recent years, merging nanoprinting and holographic images into a single-layer metasurface has emerged as a research focus to enhance information storage capacity. However, existing multi-channel metasurface designs often limit the number of polarization states available for the holographic image. Here, a scheme is proposed and demonstrated to encode both a continuous grayscale image and a vectorial hologram with a continuously varying linear polarization distribution onto a complex amplitude-modulated metasurface. The nanoprinting and holographic images generated from dielectric metasurface exhibit broadband response for the visible light. This method paves the way for compact optical devices tailored for applications in information encoding, high-density optical storage, and information anti-counterfeiting.