Figure 8
From: Breaking the acoustic diffraction limit with an arbitrary shape acoustic magnifying lens
(a) The two dimensional schematic of Helmholtz resonator metamaterials. (b) The structural demonstrations of the realized unit cell with the parameters of \(P_2=4\) mm, \(h_1=1\) mm, \(h_2=6.38\) mm and \(R_r=1.5\) mm. (c) The retrieved relative mass density and bulk modulus extracted from full-wave simulations.
