Polarization-independent achromatic Huygens' metalens with large numerical aperture and broad bandwidth.

ABSTRACT: Achromatic lenses, which have the same focal length regardless of the illumination frequency, find strong applications in imaging, sensing, and communication systems. Making achromatic lenses with metasurfaces is highly desirable because they are flat, ultrathin, relatively light, and easily fabricable. However, existing metalenses experience combinations of limitations which include single polarization operation, narrow bandwidth, and small numerical aperture (NA). In this work, we propose a dual polarized, broadband and high NA achromatic metalens based on the Huygens' metasurface. We use Huygens' metasurface unit cells with three tunable resonances to realize a stable group delay over a large bandwidth, while also achieving high transparency and large phase tunability. With these cells,

SUBMITTER: He X 

PROVIDER: S-EPMC11501944 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature