  Conventional optical zoom system is bulky, expensive and complicated for real
time adjustment. Recent progress in the metasurface research has provided a new
solution to achieve innovative compact optical systems. In this paper, we
propose a highly integrated zoom lens with dual field-of-view (FOV) based on
double sided metasurfaces. With silicon nanobrick arrays of spatially varying
orientations sitting on both side of a transparent substrate, this ultrathin
zoom metalens can be designed to focus an incident circular polarized beam with
spin-dependent FOVs without varying the focal plane, which is important for
practical applications. The proposed dual FOV zoom metalens, with the
advantages such as ultracompactness, flexibility and replicability, can find
applications in fields which require ultracompact zoom imaging and beam
focusing.

Optics