Research / 2019 / Article / Fig 2

Research Article

Ultrathin Acoustic Parity-Time Symmetric Metasurface Cloak

Figure 2

(a) The insonified portion of the cloak () is patterned by sound absorbing Helmholtz resonators. The angular dependence of their resonances has been tuned via the resonator neck width and depth . (b–d) The theoretically and numerically computed absorption and impedance match is presented in dependence to the angle , i.e., the position of the individual Helmholtz resonators.