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. 2015 Oct 27;5:15781. doi: 10.1038/srep15781

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(a) SEM image of the fabricated sample. Scale bar: 4 μm. (b–d) Numerical (left panels) and experimental (right panels) intensity maps for λ = 532, 632.8 and 785 nm in the xz-plane. The focal length is 9 μm as indicated by the white lines.