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. 2016 May 20;7:11731. doi: 10.1038/ncomms11731

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(a) 40 helical-structured metamaterial unit cells were fabricated and utilized to construct acoustic meta-lens. (b) The transmission performance of each numbered meta-lens unit cell at 4,170 Hz. The experimental results are shown with green star dots, while blue sphere dots present numerical simulation outputs (c) The designed phase profile for synthesizing the acoustic self-accelerating beam. The blue dots represent the phase of each unit cell obtained from both the Equation (5) and the numerical simulation. The green star dots correspond to the experimentally measured phase modulation caused by each numbered unit cell. a.u., arbitrary unit.