A Spin-Encoded All-Dielectric Metahologram for Visible Light

Ansari M. A., Kim I., Lee D., Waseem M. H., Zubair M., Mahmood N., ...More

LASER & PHOTONICS REVIEWS, vol.13, no.5, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 13 Issue: 5
  • Publication Date: 2019
  • Doi Number: 10.1002/lpor.201900065
  • Journal Name: LASER & PHOTONICS REVIEWS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: dielectric metasurfaces, hydrogenated a-Si, metaholograms, spin-encoded holograms, META-HOLOGRAMS, METASURFACES, SILICON, PHASE, POLARIZATION, EFFICIENCY
  • Middle East Technical University Affiliated: Yes

Abstract

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.