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Optical tweezers are a powerful tool in colloidal physics; they can be used to trap single colloids, drive them at constant velocity through complex environments, or measure forces in the pN-fN range.

Trajectories of (left) homogenous and (right) Pt-coated silica microparticles in an optical trap.


(Left) Video of a colloidal particles driven along different directions throughout an hexagonal crystal and (right) corresponding forces measured as function of the driving angle

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