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. 2017 Jul 28;6(7):e17016. doi: 10.1038/lsa.2017.16

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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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Experimental results for the cylindrical bifocal lens. (a) Camera pictures of the cylindrical bifocal lens imaged at different distances z from the metasurface. Since the design is for a cylindrical lens, only the x-direction is focused. In the amorphous case, a bright line appears at z=0.5 mm, whereas the image shows broad diffuse lightness at the same z position in the crystalline case. At z=1 mm the bright line focus appears in the crystalline case whereas one can only observe a light patch in the amorphous case. This is in very good agreement with the theory. (b) SEM micrograph of a portion of the fabricated cylindrical metasurface lens.