A Multi‐foci Sparse‐Aperture Metalens

Author:

Xu Borui1ORCID,Wei Wei1,Tang Ping1,Shao Jingzhu1,Zhao Xiangyu1,Chen Bo1,Dong Shengxiang1,Wu Chongzhao1ORCID

Affiliation:

1. Center for Biophotonics Institute of Medical Robotics School of Biomedical Engineering Shanghai Jiao Tong University Shanghai 200240 China

Abstract

AbstractMulti‐foci lenses are essential components for optical communications, virtual reality display and microscopy, yet the bulkiness of conventional counterparts has significantly hindered their widespread applications. Benefiting from the unprecedented capability of metasurfaces in light modulation, metalenses are able to provide multi‐foci functionality with a more compact footprint. However, achieving imaging quality comparable to that of corresponding single‐foci metalenses at each focal point poses a challenge for existing multi‐foci metalenses. Here, a polarization‐independent all‐dielectric multi‐foci metalens is proposed and experimentally demonstrated by spatially integrating single‐foci optical sparse‐aperture sub‐metalenses. Such design enables the metalens to generate multiple focal points, while maintaining the ability to capture target information comparable to that of a single‐foci metalens. The proposed multi‐foci metalens is composed of square‐nanohole units array fabricated by two‐photon polymerization. The focusing characteristic and imaging capability are demonstrated upon the illumination of an unpolarized light beam. This work finds a novel route toward multi‐foci metalenses and may open a new avenue for dealing with the trade‐off between multi‐foci functionality and high‐quality imaging performance.

Funder

National Natural Science Foundation of China

Shanghai Jiao Tong University

Science and Technology Commission of Shanghai Municipality

Publisher

Wiley

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