title: Dual field-of-view step-zoom metalens.
abstract: A conventional optical zoom system is bulky, expensive, and complicated for real-time adjustment. Recent progress in metasurface research has provided a new solution to achieve innovative compact optical systems. In this Letter, we propose a highly integrated step-zoom lens with dual field of view (FOV) based on double-sided metasurfaces. With silicon nanobrick arrays of spatially varying orientations sitting on both sides of a transparent substrate, this ultrathin step-zoom metalens can be designed to focus an incident circular polarized beam with handedness-dependent FOVs without varying the focal plane, which is important for practical applications. The proposed dual FOV step-zoom metalens, with advantages such as ultracompactness, flexibility, and replicability, can find applications in fields that require ultracompact zoom imaging and beam focusing.
authors.forename: Guoxing
authors.initials: G
authors.lastname: Zheng
authors.forename: Weibiao
authors.initials: W
authors.lastname: Wu
authors.forename: Zile
authors.initials: Z
authors.lastname: Li
authors.forename: Shuang
authors.initials: S
authors.lastname: Zhang
authors.forename: Muhammad Qasim
authors.initials: MQ
authors.lastname: Mehmood
authors.forename: Ping'an
authors.initials: P
authors.lastname: He
authors.forename: Song
authors.initials: S
authors.lastname: Li