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Proof of principle of optical pushing. (a) Raw motion trace of a DNA (1.1 kbp) tethered microsphere (ϕ 4.26 μm) when there is no laser pushing force and when the laser is set to 2 W (between dashed lines). The motion of the microsphere is quenched in all three dimensions when the laser is on. Distances are relative to the DNA-surface anchor point. (b) An x,y-scatter plot of the beads position when the laser is off (black data) and set to 2 W (red data).
