Analysis of ponderomotive forces shows that wave-packet directionality and beat-wave interference can produce either pushing or pulling forces on particles, offering a mechanism for optical and acoustic tractor beams.
Ashkin,Optical Trapping and Manipulation of Neutral Particles Using Lasers(World Sci- entific, 2006)
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Pushing and Pulling Ponderomotive Forces in Wavepackets and Beat Waves
Analysis of ponderomotive forces shows that wave-packet directionality and beat-wave interference can produce either pushing or pulling forces on particles, offering a mechanism for optical and acoustic tractor beams.