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

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(a) Unit cell of the nano-aperture. The left and right panels represent the side and top views. The angle between the main axis and the x-axis is α. (b) Schematic of the calculating process of the required phase distribution. (c) Generation of a solid and a hollow spot when the designed metasurface is illuminated by light beams with predefined wavelengths. (d) Phase distribution designed for a STED lens with focal length of 10 μm.