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(Color online) Image of the tapered fiber tip optical tweezers for trapping small particle.
Sketch of the basic apparatus used for the tapered fiber optical tweezers trapping a particle in water to sense the Brownian motion force acting on the surface of the trapped particle.
(Color online) Description of Brownian motion force measuring by adjusting the optical power resulting in the variation of the depth of trapping force potential well.
Calibration results of optical power vs the external trapping force.
(Color online) Brownian motion force detected by a fiber optic force sensor.
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