Measurement approach of Brownian motion force by an abrupt tapered fiber optic tweezers

A Brownian motion force measurement fiber optic probe is fabricated and demonstrated. The specially designed abrupt tapered fiber tip can be used to trap small particles. By way of comparing the value of Brownian motion random force with the trapping force exerted on the same particle at the ambient temperature T, the Brownian motion force can be measured. (C) 2007 American Institute of Physics.