  Selective acoustic tweezers can focus the acoustic radiation force on a
single particle to manipulate it without affecting its neighbors. This has long
required highly complex hardware. In this numerical study, we show that pulsed
acoustic waves can be used for the selective manipulation of particles using
only two pairs of orthogonal transducers. While these tweezers are well-known
for their ability to manipulate arrays of particles, we show that selectivity
can be achieved by using sequences of acoustic pulses to iteratively construct
a combined acoustic potential focused only on the target particle.
