Abstract
The counterintuitive effect of pulling an object back towards a finite (bounded) circular source with the use of acoustic forces of progressive waves is demonstrated, which defines the acoustic “tractor beam” behavior [F. G. Mitri, “Near-field single tractor-beam acoustical tweezers,” Appl. Phys. Lett. 103(11), 114102, 2013; “Single Bessel tractor-beam tweezers,” Wave Motion 51(6), 986–993, 2014]. Experimental results and numerical predictions show the emergence of negative forces due to continuous (CW) and amplitude-modulated (AM) propagating waves. The circumstances under which a collimated beam emanating from a finite aperture can act as a tractor beam and related investigations are also discussed.
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