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Note from the author: With further experiments, we realized that at a higher incident power (as in the original proceeding, 1.45 mW) two-particle trapping events could happen and result in a higher value for the trap stiffness for the plasmonic tweezers. To eliminate two-particle trapping events, we have applied a lower incident power (0.6 mW) to guarantee single particle trapping and checked images of the trapped particle with a CCD camera. For a proper comparison to conventional optical tweezers, we updated the value of trap stiffness for our plasmonic tweezers for single, 0.5 µm polystyrene particle trapping at low incident power.
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