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. 2016 Dec 5;6:6. doi: 10.1038/s41598-016-0015-2

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© The Author(s) 2016

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Distribution of the azimuthal and radial components of the electric field. (a) in the absence and (b–f) in the presence of a vortex phase: (b) m = ±1, (c) m = ±2, (d) m = ±3, (e) m = ±4, (f) m = ±10. The radial component is denoted by brown lines and the azimuthal component is denoted by green lines.