Open AccessLocal phase method for designing and optimizing metasurface devices
Author(s) -
Li-Yi Hsu,
Matthieu Dupré,
Abdoulaye Ndao,
Julius E. Yellowhair,
Boubacar Kanté
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.024974
Subject(s) - optics , phase (matter) , coupling (piping) , aperture (computer memory) , metamaterial , field (mathematics) , numerical aperture , computer science , physics , materials science , acoustics , wavelength , mathematics , quantum mechanics , pure mathematics , metallurgy
Metasurfaces have attracted significant attention due to their novel designs for flat optics. However, the approach usually used to engineer metasurface devices assumes that neighboring elements are identical, by extracting the phase information from simulations with periodic boundaries, or that near-field coupling between particles is negligible, by extracting the phase from single particle simulations. This is not the case most of the time and the approach thus prevents the optimization of devices that operate away from their optimum. Here, we propose a versatile numerical method to obtain the phase of each element within the metasurface (meta-atoms) while accounting for near-field coupling. Quantifying the phase error of each element of the metasurfaces with the proposed local phase method paves the way to the design of highly efficient metasurface devices including, but not limited to, deflectors, high numerical aperture metasurface concentrators, lenses, cloaks, and modulators.