Acoustic needle focusing induced by metasurface-generated accelerating beams Di-Chao Chen, Qi Wei, Ling-Ling Huang, Xing-Feng Zhu and Da-Jian Wu EPL, 129 4 (2020) 48001 Published online: 11 March 2020 DOI: 10.1209/0295-5075/129/48001