Multiple Optical Trapping by Means of Diffractive Optical Elements

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  • Cojoc Dan
    LILIT Beamline, National Nanotechnology Laboratory-TASC, Istituto Nazionale per la Fisica della Materia (INFM) at Elettra Research Center for Optoelectronics, ‘Politehnica’ University of Bucharest
  • Emiliani Valentina
    Institut Jacques Monod, UMR 7592, CNRS, Univeristé P6/P7
  • Ferrari Enrico
    LILIT Beamline, National Nanotechnology Laboratory-TASC, Istituto Nazionale per la Fisica della Materia (INFM) at Elettra
  • Malureanu Radu
    LILIT Beamline, National Nanotechnology Laboratory-TASC, Istituto Nazionale per la Fisica della Materia (INFM) at Elettra
  • Cabrini Stefano
    LILIT Beamline, National Nanotechnology Laboratory-TASC, Istituto Nazionale per la Fisica della Materia (INFM) at Elettra
  • Proietti Remo Zaccaria
    LILIT Beamline, National Nanotechnology Laboratory-TASC, Istituto Nazionale per la Fisica della Materia (INFM) at Elettra
  • Di Fabrizio Enzo
    LILIT Beamline, National Nanotechnology Laboratory-TASC, Istituto Nazionale per la Fisica della Materia (INFM) at Elettra

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In this paper we report multiple optical trapping of microscopic dielectric particles using diffractive optical elements implemented on twisted nematic liquid crystal spatial light modulators. The particles are trapped in arrays disposed in plane or in volume and can be moved independently in x-y-z by changing the configuration of the diffractive optical element. We show also multiple trapping using Laguerre-Gaussian and Gaussian beams simultaneously. The orbital angular momentum of the Laguerre-Gaussian beam is transferred to the particle, making it to move on a circular trajectory defined by the intensity pattern specific to this beam. We use sample cells built with two microscope slides separated by 120 μm with a sticky tape. The space between the two slides is filled with 2 μm diameter silica spheres diluted in water (concentration 0.026% wt). We show that optical trapping is also possible in a small glass capillary with a diameter of 100 μm.

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