A Dual Field-of-View Zoom Metalens

TL;DR

This paper introduces a compact, dual field-of-view zoom metalens using double-sided metasurfaces, enabling adjustable FOV without changing the focal plane, suitable for ultracompact imaging applications.

Contribution

It presents a novel dual FOV zoom metalens based on silicon nanobrick metasurfaces, offering ultracompactness and spin-dependent FOV control without focal plane variation.

Findings

Achieved dual FOV control with a single ultrathin metalens

Demonstrated spin-dependent FOV focusing

Showed potential for ultracompact zoom imaging

Abstract

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.