Journal
PHYSICAL REVIEW LETTERS
Volume 95, Issue 16, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.95.168102
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The first quantitative agreement between measured and calculated stiffnesses of optically trapped particles in the subwavelength regime is presented. It is shown for all three dimensions that the measured extent of harmonic optical trapping potentials for dielectric spheres comes very close to the theoretically predicted extent, provided all known instrumental parameters are considered. The recently predicted strong asymmetry of the trapping potential due to the electric field's linear polarization has been verified in all three directions. This effect vanishes for spheres with diameters d approximate to lambda, which exhibit the strongest trap stiffnesses.
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