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. 2017 Oct 3;7:12632. doi: 10.1038/s41598-017-13004-z

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Rotation angle of the nanoblocks along x axis for dual spots focusing at the longitudinal direction. The blue and red triangle lines represent the rotation angle for the focal spot f ₁ = 5 μm and f ₂ = 15 μm, respectively. (b) Simulated intensity profile of the reflected light in x-z plane at y = 0. (c) Corresponding vertical cut of the metalens’ focal spot (f = 5 μm). The inset is the simulated intensity profile of the reflected light in x-y plane at z = 5 μm. (d) Corresponding vertical cutting slice of the metalens’ focal spot (f = 15 μm). The inset is the simulated intensity profile of the reflected light in x-y plane at z = 5 μm.