Increasing efficiency of high numerical aperture metasurfaces using the grating averaging technique.

ABSTRACT: One of the important advantages of optical metasurfaces over conventional diffractive optical elements is their capability to efficiently deflect light by large angles. However, metasurfaces are conventionally designed using approaches that are optimal for small deflection angles and their performance for designing high numerical aperture devices is not well quantified. Here we introduce and apply a technique for the estimation of the efficiency of high numerical aperture metasurfaces. The technique is based on a particular coherent averaging of diffraction coefficients of periodic blazed gratings and can be used to compare the performance of different metasurface designs in implementing high numerical aperture devices. Unlike optimization-based methods that rely on full-wave simulations a

SUBMITTER: Arbabi A 

PROVIDER: S-EPMC7188898 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature