A Spin‐Encoded All‐Dielectric Metahologram for Visible Light

Dielectric materials that are low‐loss in the visible spectrum provide a promising platform to realize the pragmatic features of metasurfaces. Here, all‐dielectric, highly efficient, spin‐encoded transmission‐type metaholograms (in the visible domain) are demonstrated by utilizing hydrogenated amorp...

Full description

Saved in:
Bibliographic Details
Published in:Laser & photonics reviews 2019-05, Vol.13 (5), p.n/a
Main Authors: Ansari, Muhammad Afnan, Kim, Inki, Lee, Dasol, Waseem, Muhammad Hamza, Zubair, Muhammad, Mahmood, Nasir, Badloe, Trevon, Yerci, Selcuk, Tauqeer, Tauseef, Mehmood, Muhammad Qasim, Rho, Junsuk
Format: Article
Language:English
Subjects:
Amorphous silicon
Aspect ratio
Circular polarization
CMOS
Coding
dielectric metasurfaces
Dielectrics
Helicity
hydrogenated a‐Si
Image transmission
Light
metaholograms
spin‐encoded holograms
Titanium dioxide
Visible spectrum
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Dielectric materials that are low‐loss in the visible spectrum provide a promising platform to realize the pragmatic features of metasurfaces. Here, all‐dielectric, highly efficient, spin‐encoded transmission‐type metaholograms (in the visible domain) are demonstrated by utilizing hydrogenated amorphous silicon (a‐Si:H). In comparison to previously reported visible metaholograms based on TiO2 and other dielectric materials, all‐dielectric metasurfaces provide a cost‐effective more straightforwardly fabricated (aspect ratio 4.7), CMOS compatible, and comparably efficient solution in the visible domain. A unique way of utilizing polarization as an extra degree of freedom in the design to implement transmission‐type helicity‐encoded metaholograms is also proposed. The produced images exhibit high fidelity under both right and left circularly polarized illuminations. The proposed cost‐effective and CMOS‐compatible material and methods open up an avenue for on‐chip development of numerous new phenomena with high efficiency in the visible domain. A spin‐encoded all‐dielectric metahologram is proposed. A cost‐effective and highly efficient transmission‐type spin‐encoded metahologram is demonstrated by utilizing hydrogenated amorphous silicon (a‐Si:H) nanorods. The size of the metahologram is 400 µm2. The single metahologram device is capable of producing off‐axis holographic images at a distance of 200 µm in the propagation direction, depending on the helicity of the incident light.
ISSN:1863-8880
1863-8899
DOI:10.1002/lpor.201900065