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. 2016 May 20;6:25639. doi: 10.1038/srep25639

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(a) Floquet harmonics and (c) normalized farfield patterns of the metasurface grating with m = +1 and m = +2. (b) Floquet harmonics and (d) normalized farfield patterns of the metasurface grating with m = +1 and m = −2.