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. 2014 Sep 1;4:6257. doi: 10.1038/srep06257

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(a) The normalized squared absolute pressure, displaying the pattern of the designed far-field multi foci. (b) The field distribution of the squared absolute pressure around the multi foci. (c,d) The radial distributions of the squared absolute pressure at the cross sections z = 18.4λ and z = 24.2λ, and their respective field distributions.