Li Quan

TL;DR: In this paper, a meta-atom with Willis coupling was proposed, which is much simpler and less prone to thermo-viscous losses than previously reported structures, and the authors performed two-dimensional experiments to measure the strong Willis coupling.

TL;DR: In this paper, the authors demonstrate experimentally the functioning principle of a reconfigurable acoustic metagrating for anomalous reflection with high efficiency, using coarse geometric design features and demonstrate reconfigurability in angle and operating frequency.

TL;DR: It is shown that nonlocalities produced by strong coupling between neighboring impedance elements enable extreme anisotropic responses for sound traveling over a surface, supporting negative phase and energy velocities, as well as hyperbolic propagation for acoustic surface waves.

TL;DR: In this paper, the authors explore the transverse energy tunneling between neighboring constituent elements, and achieve unitary anomalous reflection using fully $p\phantom{\rule{0}{0ex}}a\phantastic{0{0}ex}}s\phantine{0,0ex}s''phantom{0,0ex''i\phanto{0},0ex]v''phanto[0, 0]e$ metasurface elements.