Fig. 2
Imaging a ZGV Lamb mode. a, b Normalized images of the measured out-of-plane surface particle velocity at a 0.2391 and b 1.6900 GHz. The x and y axis directions are shown in Fig. 1a. Animations are viewable in the Supplementary Movie 1. c 2D acoustic field at 1.6900 GHz based on a fit to a Bessel function J0(kr). d Normalized out-of-plane surface particle velocity evolution of the experimental (dots) and fitted (solid line) data as a function of radial distance for a frequency of 1.6900 GHz (dashed lines in b and c)
