  The ongoing effort to implement compact and cheap optical systems is the main
driving force for the recent flourishing research in the field of optical
metalenses. Metalenses are a type of metasurface, used for focusing and imaging
applications, and are implemented based on the nanopatterning of an optical
surface. The challenge faced by metalens research is to reach high levels of
performance, using simple fabrication methods suitable for mass-production. In
this paper we present a Huygens nanoantenna based metalens, designed for
outdoor photographic/surveillance applications in the near-infra-red. We show
that good imaging quality can be obtained over a field-of-view (FOV) as large
as +/-15 degrees. This first successful implementation of metalenses for
outdoor imaging applications is expected to provide insight and inspiration for
future metalens imaging applications.
