Coherently switching the focusing characteristics of all-dielectric metalenses

Author:

He Fei12,Feng Yu1,Pi Hailong1,Yan Jize1,MacDonald Kevin F.1ORCID,Fang Xu1ORCID

Affiliation:

1. University of Southampton

2. University of Nottingham

Abstract

Flat, gradient index, metasurface optics – in particular all-dielectric metalenses – have emerged and evolved over recent years as compact, lightweight alternative to their conventional bulk glass/crystal counterparts. Here we show that the focal properties of all-dielectric metalenses can be switched via coherent control, which is to say by changing the local electromagnetic field in the metalens plane rather than any physical or geometric property of the nanostructure or surrounding medium. The selective excitation of predominantly electric or magnetic resonant modes in the constituent cells of the metalens provides for switching, by design, of its phase profile enabling binary switching of focal length for a given lens type and, uniquely, switching between different (spherical and axicon) lens types.

Funder

Royal Society

Engineering and Physical Sciences Research Council

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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