On-chip integrated metasystem for spin-dependent multi-channel colour holography

TL;DR

This paper introduces an on-chip metasurface that enables multi-channel, color holography by projecting multiple images at different distances and colors, using a single metasurface design with polarization dependence.

Contribution

It presents a novel end-to-end inverse design scheme for a single-cell metasurface that achieves multi-channel, colorful holography on-chip, which is easier to implement and fabricate than previous methods.

Findings

Holographic images generated at 18 independent channels.

Single-cell metasurface encodes multiple RGB patterns.

Design scheme is practical for nanophotonics applications.

Abstract

On-chip integrated metasurface driven by in-plane guided waves is of great interests in various light field manipulation applications such as colorful augmented reality and holographic display. However, it remains a challenge to design colorful multichannel holography by a single on-chip metasurface. Here we present metasurfaces integrated on top of guided-wave photonic slab that achieves multi-channel colorful holographic light display. An end-to-end scheme is used to inverse design the metasurface for projecting off-chip preset multiple patterns. Particular examples are presented for customized patterns that were encoded into the metasurface with a single-cell meta-atom, working simultaneously at RGB color channels and for several different diffractive distance, with polarization dependence. Holographic images are generated at 18 independent channels with such a single-cell metasurface. The proposed design scheme is easy to implement and the resulting device is viable to fabrication, promising a plenty of applications in nanophotonics.