Using optical absorption to reduce cross-talk in spatially multiplexed waveguiding metasurfaces.

ABSTRACT: Dual-wavelength metasurfaces often employ spatial multiplexing design concepts where two interleaved lattices of meta-atoms, each designed for a specific wavelength, occupy the same layer. However, this arrangement incurs efficiency losses as each wavelength inevitably "sees" unintended meta-atoms designed for the other wavelength, causing spurious interference (crosstalk) effects, which are especially affecting the shorter wavelength. In this paper, we numerically demonstrate that the crosstalk can be reduced by introducing some optical absorption at the shorter wavelength, unveiling the near-field mechanisms at play. Then, through designing and simulating a dual-wavelength beam-steering metasurface, we demonstrate the benefits of certain level of absorption in terms of wavefront purity (

SUBMITTER: Loke S 

PROVIDER: S-EPMC11499906 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature