Reconfigurable metasurface hologram by utilizing addressable dynamic pixels

Abstract

The flatness, compactness and high-capacity data storage capability make metasurfaces well-suited for holographic information recording and generation. However, most of the metasurface holograms are static, not allowing a dynamic modification of the phase profile after fabrication. Here, we propose and demonstrate a dynamic metasurface hologram by utilizing hierarchical reaction kinetics of magnesium upon a hydrogenation/dehydrogenation process. The metasurface is composed of composite gold/magnesium V-shaped nanoantennas as building blocks, leading to a reconfigurable phase profile in a hydrogen/oxygen environment. We have developed an iterative hologram algorithm based on the Fidoc method to build up a quantified phase relation, which allows the reconfigurable phase profile to reshape the reconstructed image. Such a strategy introduces actively controllable dynamic pixels through a hydrogen-regulated chemical process, showing unprecedented potentials for optical encryption, information processing and dynamic holographic image alteration.

Tunable metasurfaces towards versatile metalenses and metaholograms: a review

“…External stimuli can be classified as electrical or non-electrical stimuli. Therefore, this section presents electrically tunable [149][150][151][152][153][154][155] and non-electrically tunable 34,[156][157][158][159][160][161][162][163][164] methods to tune metaholograms.…”

Recent advances in optical dynamic meta-holography

“…The authors demonstrated a reconfigurable meta-hologram with gold nanorods on a stretchable polydimethylsiloxane substrate. Stretchable metasurfaces have also been used in studies of actively tunable structural color 85,86 and zoom metalenses 88 . Stretching the substrate could change the spectrum response of the metasurface 85,86 , focal length of the metalens 88 , and distance of the image display plane from the meta-hologram panel 87 .…”

“…Stretchable metasurfaces have also been used in studies of actively tunable structural color 85,86 and zoom metalenses 88 . Stretching the substrate could change the spectrum response of the metasurface 85,86 , focal length of the metalens 88 , and distance of the image display plane from the meta-hologram panel 87 . By coding several reconstructed images at different distances into one piece of metasurface on a stretchable substrate, the displayed holographic images on the same observation plane can be switched by stretching the metasurface device, as shown in Fig.…”

Tunable Metasurfaces: The Path to Fully Active Nanophotonics

“…A similar idea also demonstrated switchable holograms using composite meta‐atoms that can be freely hydrogenated. [ 94 ] These two concepts have also been combined to create dual‐functional metasurfaces that can be used to switch between color printing and holography applications in a single device (Figure 3c). [ 95 ] This further extends the possibilities of using the same metasurface for completely different applications through.…”