Phase-Only Holographic Assisted Planar Printing for Massively Multiplexed Optical Display and Encryption

TL;DR

This paper introduces a novel angle multiplexing framework that combines holography and printing, enabling hundreds of channels for high-capacity display and encryption with experimental demonstrations of grayscale images, videos, and metasurface-based printing.

Contribution

It presents a new method that unifies holographic and printing techniques for massively multiplexed optical channels, surpassing previous limitations.

Findings

Successfully encoded 25 grayscale printings into 25 angles.

Demonstrated 8 grayscale videos multiplexed into 8 angles.

Created a 324-channel metasurface printing multiplexing angles, polarizations, and wavelengths.

Abstract

Multiplexed planar printings, made of single or few layer micro and nano optical platforms, are essential for high capacity display, information storage and encryption. Although having been developed rapidly, the demonstrated channels are still limited and also lack instantaneity. Here, holograms and printings, always regarded as two independent information coding domains with totally different principles, are combined together through our proposed angle multiplexing framework, leading to multiplexed printings with hundreds of channels. Based on such approach, we experimentally encode respectively 25 gray scale printings into 25 angles and even 8 gray scale videos into 8 angles with a phase-only spatial light modulator. As a bridge between printings and holograms, our method allows to generate printings combining various holographic methods. Beneficial from this, we demonstrate a gradient metasurface based 324 channel printing which multiplexes angles, polarizations and wavelengths simultaneously. Our work paves the way to flexibly angle-dependent printing display and massively multiplexed encryption systems.