Browsing by Author "Petrov, D."
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Item Open Access Generation of cylindrical vector beams with few-mode fibers excited by Laguerre–Gaussian beams(Elsevier, 2004-07-01) Volpe, Giovanni; Petrov, D.We propose a novel method to efficiently produce light beams with radial, azimuthal, and hybrid polarization, through a few-mode fiber excited by a Laguerre–Gaussian beam. With different input polarization we can selectively excite different combinations of modes from the LP11 group. We propose to show how to transform the output beam into a cylindrical vector beam in free-space through various polarization transformations.Item Open Access Surface plasmon radiation forces(The American Physical Society, 2006-06) Volpe, Giovanni; Quidant, R.; Badenes, G.; Petrov, D.We report the first experimental observation of momentum transfer from a surface plasmon to a single dielectric sphere. Using a photonic force microscope, we measure the plasmon radiation forces on different polystyrene beads as a function of their distance from the metal surface. We show that the force magnitude at resonance is strongly enhanced compared to a nonresonant illumination. Measurements performed as a function of the probe particle size indicate that optical manipulation by plasmon fields has a strong potential for optical sorting.Item Open Access Torque detection using brownian fluctuations(The American Physical Society, 2006-11-24) Volpe, Giovanni; Petrov, D.We report the statistical analysis of the movement of a submicron particle confined in a harmonic potential in the presence of a torque. The absolute value of the torque can be found from the auto- and cross-correlation functions of the particle’s coordinates. We experimentally prove this analysis by detecting the torque produced onto an optically trapped particle by an optical beam with orbital angular momentum.