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We demonstrate a new method for determining the radius of micron-sizedparticles trapped by a vortex laser beam. The technique is based on measuringthe rotation experienced by the center of mass of a microsphere that islaterally displaced by a Stokes drag force to an off-axis equilibrium position.The rotation results from an optical torque pointing along the directionopposite to the vortex beam angular momentum. We fit the rotation angle datafor different Laguerre-Gaussian modes taking the radius as a fitting parameterin the Mie-Debye theory of optical tweezers. We also discuss how micron-sizedbeads can be used as probes for optical aberrations introduced by theexperimental setup.

Precise in situ radius measurement of individual optically trapped microspheres using negative optical torque exerted by focused vortex beams