Abstract
We theoretically propose and experimentally demonstrate acoustic metasurfaces that exhibit undistorted transmission and configurable reflection, therefore serving as remarkable veil structures with camouflage effects for sonars, hereby denoted as acoustic metaveils. The metaveil is composed of a configurable array of two acoustic meta-atoms, which are the flipped counterparts of each other. Reciprocity and space inversion guarantee distortion-free transmission in an ultrabroad spectrum, irrespective of the arrangement of the array, while the reflection can be conveniently manipulated by changing the arrangement to produce the desired acoustic camouflage. Three types of unusual reflection behaviors are demonstrated, including diffuse reflection, multibeam reflection, and reflective focusing. The acoustic metaveils open a way to independently manipulate the reflection without influencing the acoustic transmission wave front, which is a crucial step for sonar stealth and camouflage.
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