Research / 2019 / Article / Fig 3

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.