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. 2018 Mar 23;7:17157. doi: 10.1038/lsa.2017.157

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Dynamic optical focusing with a metasurface absorber of substantially sub-wavelength thickness. (a) A focused signal beam A produces focal spot 1. A coherent structured control beam B modifies signal beam A by controlling absorption on a metasurface absorber, producing (b) a modified focal spot 2 or (c) eliminating the focal spot altogether.