Science Daily  December 6, 2022 The transfer of wave momentum is a fundamental mechanism for contactless manipulation, yet the rules of conventional scattering intrinsically limit the radiation force based on the shape and the size of the manipulated object. Researchers at the University of Minnesota showed that this intrinsic limit can be broken for acoustic waves with subwavelength metasurfaces. Harnessing anomalous metasurface scattering, they demonstrated self-guidance, where a metasurface object is autonomously guided by an acoustic wave, and tractor beaming, where a metasurface object is pulled by the wave. According to the researchers their results show that bringing the metasurface […]