Optical Properties of Artificial Chiral Metasurfaces

Here we investigate optical chiral properties of metasurfaces fabricated by means of nanosphere lithography. This low-cost and simple technique combined with angled evaporation of a plasmonic layer was employed to produce arrays of tilted elliptical nanoholes in Au or Ag. The elliptical shape and the in-plane tilt lead to the symmetry breaking, which further enables different coupling with circularly polarized light of opposite handedness. We investigate intrinsic and extrinsic chiral behavior in the visible and near infrared range, and report on possibilities to use this approach for chiral sensing and chiral light manipulation at the nanoscale.