Simultaneous spectral and spatial modulation for color printing and holography using all-dielectric metasurfaces

TL;DR

This paper introduces a dielectric metasurface capable of simultaneously performing color printing and holography by modulating spectral and spatial light responses at the subwavelength scale, enabling advanced security features.

Contribution

The work presents a novel all-dielectric metasurface integrating color printing and holography with a new design method using a modified Gerchberg-Saxton algorithm for multiple sub-holograms.

Findings

Successfully demonstrated combined color and holographic imaging.

Achieved independent control of spectral and spatial responses at the pixel level.

Enhanced information capacity for security and anti-counterfeiting applications.

Abstract

Metasurfaces possess the outstanding ability to tailor phase, amplitude and even spectral responses of light with an unprecedented ultrahigh resolution, thus have attracted significant interests. Here, we propose and experimentally demonstrate a novel meta-device that integrates color printing and computer-generated holograms within a single-layer dielectric metasurface by modulating spectral and spatial responses at subwavelength scale, simultaneously. In our design, such metasurface appears as a microscopic color image under white light illumination, while encrypting two different holographic images that can be projected at the far-field when illuminated with red and green laser beams. We choose amorphous silicon dimers and nanofins as building components and use a modified parallel Gerchberg-Saxton algorithm to obtain multiple sub-holograms with arbitrary spatial shapes for image-indexed arrangements. Such a method can further extend the design freedom of metasurfaces. By exploiting spectral and spatial control at the level of individual pixels, multiple sets of independent information can be introduced into a single-layer device, the additional complexity and enlarged information capacity are promising for novel applications such as information security and anti-counterfeiting.