Abstract

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

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Am. J. Phys.

M. J. Lang and S. M. Block, �??Resource Letter: LBOT-1: Laser based optical tweezers,�?? Am. J. Phys. 71, 201�??215 (2003).
[CrossRef]

J. Mod. Opt.

W. Singer, S. Bernet, N. Hecker, and M. Ritsch-Marte, �??Three-dimensional force calibration of optical tweezers,�?? J. Mod. Opt. 47, 2921�??2931 (2000).

N. B. Simpson, D. McGloin, K. Dholakia, L. Allen, and M. J. Padgett, �??Optical tweezers with increased axial trapping efficiency,�?? J. Mod. Opt. 45, 1943�??1949 (1998).

J. Opt. B: Quantum Semiclass. Opt.

S. Chávez-Cerda, M. J. Padgett, I. Allison, G. H. C. New, J. C. Guitiérrez-Vega, A. T. O�??Neil, I. MacVicar, and J. Courtial, �??Holographic generation and orbital angular momentum of high-order Mathieu beams,�?? J. Opt. B: Quantum Semiclass. Opt. 4, 52�??57 (2002).
[CrossRef]

Nature

M. P. MacDonald, G. C. Spalding, and K. Dholakia, �??Microfluidic sorting in an optical lattice,�?? Nature 426, 421�??424 (2003).
[CrossRef]

D. G. Grier, �??A revolution in optical manipulation,�?? Nature 424, 810�??816 (2003).
[CrossRef]

V. Garcés-Chávez, D. McGloin, H. Melville, W. Sibbett, and K. Dholakia, �??Simultaneous micromanipulation in multiple planes using a self-reconstructing light beam,�?? Nature 419, 145�??147 (2002).
[CrossRef]

Opt. Commun.

J. Liesener, M. Reicherter, T. Haist, and H. J. Tiziani, �??Multi-functional optical tweezers using computer-generated holograms,�?? Opt. Commun. 185, 77�??82 (2000).
[CrossRef]

J. E. Curtis, B. A. Koss, and D. G. Grier, �??Dynamic holographic optical tweezers,�?? Opt. Commun. 207, 169�??175 (2002).
[CrossRef]

D. McGloin, G. C. Spalding, H. Melville, W. Sibbett, and K. Dholakia, �??Three-dimensional arrays of optical bottle beams,�?? Opt. Commun. 225, 215�??222 (2003).
[CrossRef]

Opt. Express

W. J. Hossack, E. Theofanidou, J. Crain, K. Heggarty, and M. Birch, �??High-speed holographic optical tweezers using a ferroelectric liquid crystal microdisplay,�?? Opt. Express 11, 2053�??2059 (2003), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-17-2053.">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-17-2053</a>

H. Melville, G. F. Milne, G. C. Spalding, W. Sibbett, K. Dholakia, and D. McGloin, �??Optical trapping of three-dimensional structures using dynamic holograms,�?? Opt. Express 11, 3562�??3567 (2003), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-26-3562.">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-26-3562</a>

J. Leach, G. Sinclair, P. Jordan, J. Courtial, M. J. Padgett, J. Cooper, and Z. J. Laczik, �??3D manipulation of particles into crystal structures using holographic optical tweezers,�?? Opt. Express 12, 220�??226 (2004), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-1-220.">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-1-220</a>
[CrossRef]

A. Jesacher, S. Fürhapter, S. Bernet, and M. Ritsch-Marte, �??Diffractive optical tweezers in the Fresnel regime,�?? Opt. Express 12, 2243�??2250 (2004), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-10-2243.">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-10-2243.</a>
[CrossRef]

P. J. Rodrigo, R. L. Eriksen, V. R. Daria, and J. Glückstad, �??Interactive light-driven and parallel manipulation of inhomogeneous particles,�?? Opt. Express 10, 1550�??1556 (2004), <a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-26-1550.">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-10-26-1550</a>

Opt. Lett.

Phys. Rev. Lett.

J. E. Curtis and D. G. Grier, �??Structure of optical vortices,�?? Phys. Rev. Lett. 90, 133901 (2003).
[CrossRef]

A. T. O�??Neil, I. MacVicar, L. Allen, and M. J. Padgett, �??Intrinsic and extrinsic nature of the orbital angular momentum of a light beam,�?? Phys. Rev. Lett. 88, 053601 (2002).
[CrossRef]

P. T. Korda, M. B. Taylor, and D. G. Grier, �??Kinetically locked-in colloidal transport in an array of optical tweezers,�?? Phys. Rev. Lett. 89, 128301 (2002).
[CrossRef]

Science

M. P. MacDonald, L. Paterson, K. Volke-Sepulveda, W. Sibbett, and K. Dholakia, Science 296, 1101 (2002).
[CrossRef]

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