Subwavelength acoustic focusing within multi-breadth bands with a window-shape metasurfaceFeng Gao, Jianlan Xie, Yuchen Peng, Bei Yan, Exian Liu, Peng Peng, Hang Li, Jiapei Jiang and Jianjun LiuEPL, 132 3 (2020) 38003DOI: https://doi.org/10.1209/0295-5075/132/38003