Research Article
Ultrathin Acoustic Parity-Time Symmetric Metasurface Cloak
Figure 3
(a) The amplifying portion of the metasurface cloak has been decorated by loudspeakers that are controlled by gain circuits. (b) The anisotropic transmission resonance with omnidirectional full transmission and one-sided zero reflection is accompanied by a spatial symmetry of the measured intensity profile , which was the experimental parameter for the gain adjustment.