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. 2017 Oct 20;6(10):e17071. doi: 10.1038/lsa.2017.71

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/

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Design of a multifocal metalens with conic shapes. Schematics of (a) an ellipsoid and (b) a hyperboloid with the two foci at points F₁ and F₂. The intersection of a plane with the ellipsoid (hyperboloid) results in an elliptical (hyperbolic) curve. (c) Schematic of a metalens composed of nanoslits with two foci at F₁ and F₂ under the illumination of CP light. ϕ is the orientation angle of a nanoslit relative to the x axis. Points F₁′ and F₂′ are the mirror points of F₁ and F₂, respectively, with respect to the metalens.