Figure 3
From: Manipulating Acoustic Wavefront by Inhomogeneous Impedance and Steerable Extraordinary Reflection
Wavefront metamorphosis via SAI interface, with impedance discontinuity d = 0.1772.
A plane acoustic wave of θ = 15 Krad/s is normally incident in water. Only reflected acoustic pressure is plotted. (a) The SAI of Eq.(7) with ψ(y) = 0.7 y 2 is set along the flat surface. pre diverges into a curved wavefront. (b) The SAI of Eq.(7) with 
is set. pre converges to a focal point in the two-dimensional case.
