We have tractor beams now!
After working with single Bessel beams to try and perfect a tractor beam and failing, New York University physicists David Ruffner and David Grier assembled a device that overlaps two Bessel beams. That overlap, combined with a slight distortion of the beams from a specialized lens, creates a strobing effect in the beams, producing enough energy to pull tiny grains of silica back toward the source of the beams.
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