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. 2018 Dec 10;8:17746. doi: 10.1038/s41598-018-36082-z

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© The Author(s) 2018

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Schematic top view of the tapered grating coupler. The grating lines have a circular curvature as is indicated by the dashed circle. The fiber mode with 10 µm beam diameter fits inside the wedge as indicated by the gray transparent circle. The opening angle of the wedge is α = 26°.