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Active particle sorting ( Media 6 (2.1MB, MOV) ). In a first trapping stage we prepare 10 μm polystyrene beads in a continuous flow with a speed of about 20 μm/s to occupy a plane centered vertically in the capillary. Then they enter the region shown in this image with three nodal planes, where some particles are selectively pushed with optical forces to the upper plane. Also shown in this image are markers indicating the positions of the nodal planes and the laser beam.
