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Optics Letters

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  • Vol. 30, Iss. 14 — Jul. 15, 2005
  • pp: 1797–1799

Optical levitation and manipulation of stuck particles with pulsed optical tweezers

Amol Ashok Ambardekar and Yong-qing Li  »View Author Affiliations


Optics Letters, Vol. 30, Issue 14, pp. 1797-1799 (2005)
http://dx.doi.org/10.1364/OL.30.001797


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Abstract

We report on optical levitation and manipulation of microscopic particles that are stuck on a glass surface with pulsed optical tweezers. An infrared pulse laser at 1.06 µm was used to generate a large gradient force (up to 10^-9 N) within a short duration (∼45 µs) that overcomes the adhesive interaction between the particles and the glass surface. Then a low-power continuous-wave diode laser at 785 nm was used to capture and manipulate the levitated particle. We have demonstrated that both stuck dielectric and biological micrometer-sized particles, including polystyrene beads, yeast cells, and Bacillus cereus bacteria, can be levitated and manipulated with this technique. We measured the single-pulse levitation efficiency for 2.0 µm polystyrene beads as a function of the pulse energy and of the axial displacement from the stuck particle to the pulsed laser focus, which was as high as 88%.

© 2005 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation

Citation
Amol Ashok Ambardekar and Yong-qing Li, "Optical levitation and manipulation of stuck particles with pulsed optical tweezers," Opt. Lett. 30, 1797-1799 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-14-1797


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