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