Abstract
We have used a high-resolution back-focal-plane detector to make simultaneousmeasurements of the axial and lateral force constants of a micron-sizedparticle in a single-beam optical gradient trap. We measure the opticalforce applied to the trapped particle as a function of the relative index ofrefraction of particle and medium, the radius of the particle, and the laserbeam power. Results are compared with recent theoretical predictions.
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