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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 17 — Aug. 23, 2004
  • pp: 4129–4135

Size selective trapping with optical “cogwheel” tweezers

Alexander Jesacher, Severin Fürhapter, Stefan Bernet, and Monika Ritsch-Marte  »View Author Affiliations

Optics Express, Vol. 12, Issue 17, pp. 4129-4135 (2004)

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We experimentally investigate the size-selective trapping behavior of Laguerre-Gaussian beams (“doughnut-beams”) and “cogwheel”-shaped beams which are collinear superpositions of two doughnut beams of equal opposite helical index. Experimentally they are created by diffraction of a Gaussian laser beam at a high resolution refractive spatial light modulator (SLM). In the focus of an optical microscope such a beam looks similar to a “cogwheel”, i.e. the light intensity is periodically modulated around the circumference of a sphere with a precisely adjustable diameter. In an optical tweezers setup these modes can be used to trap particles or cells, provided their sizes exceed the ring diameter by a fixed amount. This promises a convenient method of constructing an optical tweezers system in microscopy which acts as a passive sorter for particles of differing sizes.

© 2004 Optical Society of America

OCIS Codes
(090.1760) Holography : Computer holography
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation

ToC Category:
Research Papers

Original Manuscript: June 25, 2004
Revised Manuscript: August 11, 2004
Published: August 23, 2004

Alexander Jesacher, Severin Fürhapter, Stefan Bernet, and Monika Ritsch-Marte, "Size selective trapping with optical �??cogwheel�?? tweezers," Opt. Express 12, 4129-4135 (2004)

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Fig. 1. Fig. 2. Fig. 3.

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