High-Efficiency Broadband Meta-Hologram with Polarization-Controlled Dual Images

TLDR

Holograms reconstruct predesigned images and have many applications, yet their use is limited by material constraints that confine them to specific electromagnetic regions; recent metasurfaces can manipulate phase across visible to microwave frequencies. The authors present a reflective, high‑efficiency meta‑hologram fabricated with metasurfaces for visible wavelengths. The meta‑hologram is built from gold cross nanoantennas with thickness ~λ/4, enabling polarization‑controlled dual images of high contrast for both coherent and incoherent light across a broad spectral range and wide incidence angles. This flexibility paves the way for holographic image applications across arbitrary electromagnetic wave regions.

Abstract

Holograms, the optical devices to reconstruct predesigned images, show many applications in our daily life. However, applications of hologram are still limited by the constituent materials and therefore their working range is trapped at a particular electromagnetic region. In recent years, the metasurfaces, an array of subwavelength antenna with varying sizes, show the abilities to manipulate the phase of incident electromagnetic wave from visible to microwave frequencies. Here, we present a reflective-type and high-efficiency meta-hologram fabricated by metasurface for visible wavelength. Using gold cross nanoantennas as building blocks to construct our meta-hologram devices with thickness ∼ λ/4, the reconstructed images of meta-hologram show polarization-controlled dual images with high contrast, functioning for both coherent and incoherent light sources within a broad spectral range and under a wide range of incidence angles. The flexibility demonstrated here for our meta-hologram paves the road to a wide range of applications related to holographic images at arbitrary electromagnetic wave region.