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. 2016 May 26;6:26875. doi: 10.1038/srep26875

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(a) Schematics of the metasurface, the seven meta-particles with different sizes and the definition of geometric parameters. (b) The reflection phase spectrum for different meta-particles under x- and y-polarization incidence, where 1 to 7 corresponding to the elements with different side length a of 5 μm, 30 μm, 45 μm, 57.5 μm, 70 μm, 85 μm, 110 μm respectively. (c) The reflection phase at 1.2 THz as a function of a for x- and y-polarized wave incidence.