title: Polarization-induced stiffness asymmetry of optical tweezers.
abstract: A tightly focused, linearly polarized laser beam, so-called optical tweezers, is proven to be a useful micromanipulation tool. It is known that there is a stiffness asymmetry in the direction perpendicular to the optical axis inherited from the polarization state of the laser. In this Letter, we report our experimental results of stiffness asymmetry for different bead sizes measured at the optimal trapping condition. We also provide the results of our generalized Lorenz-Mie based calculations, which are in good agreement with our experimental results. We also compare our results with previous reports.
authors.affiliation: Department of Physics, Institute for Advanced Studies in Basic Sciences, Zanjan 45195-1159, Iran.
authors.forename: Ebrahim
authors.initials: E
authors.lastname: Madadi
authors.forename: Akbar
authors.initials: A
authors.lastname: Samadi
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Cheraghian
authors.forename: S Nader S
authors.initials: SN
authors.lastname: Reihani
mesh_terms: D008863:Microspheres; D055620:Optical Phenomena; D052898:Optical Tweezers