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In page Tractor beam:

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In March 2011, Chinese scientists posited that a specific type of Bessel beam (a special kind of laser that does not diffract at the center) is capable of creating a pull-like effect on a given microscopic particle, forcing it toward the beam-source.[9][10] The underlying physics is the maximization of forward scattering via interference of the radiation multipoles. They show explicitly that the necessary condition to realize a negative (pulling) optical force is the simultaneous excitation of multipoles in the particle. If the total photon momentum projection along the propagation direction is small, attractive optical force is possible.[11] The Chinese scientists suggest this possibility may be implemented for optical micromanipulation.[citation needed]