Abstract
It is theoretically shown that the translational wave-induced movement of a small (compared to the wavelength) object is possible even when the time-average force on it is zero. In this case, the object moves, oscillating in the forward and backward directions. The predominant motion of the object in a given direction is found to require the optimum choice of a carrier-wave phase with respect to the leading edge of the wave pulses. A substantial feature of this wave transport mechanism is the possibility of inversion of the object motion direction by merely changing the phase shift and retaining the previous direction of wave propagation. The transport of an object under the action of pulses with various envelope shapes is studied. The undesirable backward motion of the object with respect to the main forward direction is found to decrease for an exponential envelope; when this envelope is optimized, the backward motion is completely eliminated.
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