Experimental Evidence of High‐Efficiency Nonlocal Waterborne Acoustic Metasurfaces

Inspired by recent theoretical demonstrations of nonlocal waterborne acoustic metasurfaces (WAMs), herein experimental evidence of a WAM with highly nonlocal features for high‐efficient waterborne sound control is proposed. An easy‐to‐implement nonlocal metasurface with enhanced long‐range interaction is designed and the effects of fluid–solid interaction (FSI) are considered. Results show that the nonlocal WAMs are observed to manipulate underwater sound with enhanced efficiency, as high as 97% was experimentally achieved, compared with a maximum efficiency of 71% of the conventional local devices. Besides, the robustness against frequency fluctuations and coarse discretization of the nonlocal WAMs are observed. The proposed device is potentially applicable for underwater signal communication and high‐resolution ultrasonic imaging.