Near-field imaging of phased array metasurfaces

B. J. Bohn , M. Schnell , M. Kats , F. Aieta , R. Hillenbrand , and F. Capasso

Nano Letters, 2015, 15 (6), pp 3851–3858 (2015)
Phased-antenna metasurfaces can impart abrupt, spatially-dependent changes to the amplitude, phase, and polarization of light and thus mold wavefronts in a desired fashion. Here we present an experimental and computational near-field study of metasurfaces based on near-resonant V-shaped antennas, and connect their near- and far-field optical responses. We show that far-fields can be obtained from limited, experimentally-obtained knowledge of the near-fields, paving the way for experimental near-field characterization of metasurfaces and other optical nanostructures and prediction of their far-fields from the near-field measurements.