Reflective metalens with an enhanced off-axis focusing performance

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Metalenses are one of the most promising metasurface applications. However, all-dielectric reflective metalenses are rarely studied, especially regarding their off-axis focusing performance. After experimentally studying the material optical properties in this work, we propose reflective metalens based on titanium dioxide (TiO2) and silicon dioxide (SiO2), which operate at a visible wavelength of 0.633 µm. Unlike conventional reflective metalenses based on metallic mirrors, the proposed device was designed based on a modified parabolic phase profile and was integrated onto a dielectric distributed Bragg reflector periodic structure to achieve high reflectivity with five dielectric pairs. The focusing efficiency characteristics of the metalens were experimentally studied for beam angles of incidence between 0∘ and 30∘. The results reveal that the focusing efficiency for the modified metalens design remains higher than 54%, which is higher than 50%, making it promising for photonic miniaturization and integration.
Original languageEnglish (US)
Pages (from-to)34117
JournalOptics Express
Volume30
Issue number19
DOIs
StatePublished - Sep 2 2022

Bibliographical note

KAUST Repository Item: Exported on 2022-09-14
Acknowledged KAUST grant number(s): BAS/1/1664-01-01, REP/1/3189-01-01), URF/1/3437-01-01, URF/1/3771-01-01
Acknowledgements: Competitive Research (URF/1/3437-01-01, URF/1/3771-01-01); GCC Research Council (REP/1/3189-01-01); King Abdullah University of Science and Technology (BAS/1/1664-01-01).

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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