Multiple optical trapping by means of diffractive optical elements

Cojoc, Dan, Emiliani, Valentina, Ferrari, Enrico , Malureanu, Radu, Cabrini, Stefano, Proietti, Remo Zaccaria and Di Fabrizio, Enzo (2004) Multiple optical trapping by means of diffractive optical elements. Japanese Journal of Applied Physics, 43 (6B). pp. 3910-3915. ISSN 0021-4922

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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.

Keywords:diffractive optical elements, Optical tweezers
Subjects:F Physical Sciences > F360 Optical Physics
F Physical Sciences > F310 Applied Physics
F Physical Sciences > F361 Laser Physics
Divisions:College of Science > School of Life Sciences
ID Code:8382
Deposited On:29 Mar 2013 17:42

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