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A Spin‐Encoded All‐Dielectric Metahologram for Visible Light
Author(s) -
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
Publication year - 2019
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201900065
Subject(s) - dielectric , visible spectrum , materials science , optoelectronics , polarization (electrochemistry) , cmos , optics , physics , chemistry
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 TiO 2 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.