Figure 5: Acoustic pulling force originated from the acoustic bottle beam.
From: Generation of acoustic self-bending and bottle beams by phase engineering
(a) Schematic of the setup used for measuring the acoustic radiation force with a rigid hard plastic ball. (b) Calculated acoustic intensity of the bottle beam in the presence of the rigid ball (corresponding to the position z=0.383 in c), where the stronger scattering at the bottom indicates the origination of a pulling force; scale bar, 0.1 m. (c) Experimentally measured (blue data points) and numerically simulated (red curve) acoustic radiation forces of the bottle beam at different axial locations, where the region below the dashed line in c indicates the existence of the acoustic pulling forces in the opposite direction of the beam propagation as well as the gravity. The error bar depicts the standard deviation of our measurement. a.u., arbitrary unit.
