Design and Simulation of Polarization-Sensitive ENNZ-Lined Apertures for Visible-Light Metasurfaces

Many proposed visible-light metasurface designs are limited in their ability to confine light on a subwavelength scale, which reduces their maximum efficiency due to discretization errors. Plasmonic metasurfaces show great promise in this regard, as their unit cells can be made deeply subwavelength. Unfortunately, current designs are limited to simple structures due to fabrication difficulty, and are forced to rely on limited efficiency polarization conversion effects. In this work, we extend the concept of ENNZ-lined apertures that has been used to create metasurface unit cells in the near-IR regime to the visible regime by relaxing the requirement that the unit cells be polarization-insensitive.