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. 2017 Nov 3;7:14611. doi: 10.1038/s41598-017-14449-y

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© The Author(s) 2018

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Intensity distribution of the focal field at λ = 532 nm (a) in the x-y plane (z = 2 µm) and (d,e) in the x-z plane (y = 0). E_x phase distribution of the bifocal metalens with geometrical topological charge of (b) 0 and (c) 2, respectively. (f,g) The line-scan of the distribution in the focal plane for (d,e).