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. 2018 Mar 20;8:4884. doi: 10.1038/s41598-018-23382-7

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© The Author(s) 2018

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) Measured intensity profiles at the focal plane of z = 200 μm. Form the first row to the last row, the corresponding HC metasurface parameters change with the order: (K = 0, l = 1), (K = 1, l = 1), (K = 0, l = 3), (K = 1, l = 3), (K = 0, l = 5) and (K = 1, l = 5). And from left column to right column, the laser wavelength changes with the order 405 nm, 532 nm and 633 nm. (b) Simulated intensity and phase profiles at the focal plane of z = 200 μm at 532 nm. The yellow spiral curves in the phase profiles represent the intensity trajectories.