Three-dimensional magneto-optic trap for micro-object manipulation

Year: 2001

Authors: Sacconi L., Romano G., Ballerini R., Capitanio M., De Pas M., Giuntini M., Dunlap D., Finzi L., Pavone FS.

Autors Affiliation: European Laboratory for Non-Linear Spectroscopy, Largo E. Fermi 2, 50125 Florence, Italy; Advanced Light and Electron Microscopy BioImaging Center, San Raffaele Scientific Institute, Via Olgettina 58, Milan 20132, Italy; Department of Biology, University of Milan, Via Celoria 26, Milan 20133, Italy; Department of Physics, University of Perugia, 06100 Perugia, Italy; Istituto Nazionale per la Fisica della Materia Sezione Firenze, Largo E. Fermi 2, 50125 Florence, Italy

Abstract: A magneto-optic trap for micro-objects is described, Magnetic beads were trapped by optical tweezers while being rotated by a new integrated magnetic manipulator. Rotation was achieved with eight electromagnets with tip-pole geometry. The time orbital potential technique was used to achieve rotation of magnetic beads. Trapping in three dimensions and rotation of magnetic beads on three axes are demonstrated with forces up to 230 pN and force momenta of up to 10(-16) N m. A position-detection apparatus based on an interferometric scheme provides nanometer sensitivities in a few milliseconds. (C) 2001 Optical Society of America.

Journal/Review: OPTICS LETTERS

Volume: 27 (17)      Pages from: 1359  to: 1361

KeyWords: Laser trapping; Magneto-optic systems;
DOI: 10.1364/OL.26.001359

Citations: 67
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