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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 13 — Dec. 2, 2009

Wavelength dependence of optical tweezer trapping forces on dye-doped polystyrene microspheres

M. J. Kendrick, D. H. McIntyre, and O. Ostroverkhova  »View Author Affiliations

JOSA B, Vol. 26, Issue 11, pp. 2189-2198 (2009)

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We present an experimental and numerical study of the wavelength dependence, near resonance, of the optical tweezer trap stiffness on three different dye-doped 1 μ m polystyrene spheres with peak absorptions at λ = 625 , 775, and 840 nm. Experimentally, an increase in the trap stiffness of 35 % on the red side of resonance was observed for the dye-doped spheres relative to polystyrene spheres without dye. Numerical simulations for spheres of different sizes, between 20 nm and 1 μ m , and for absorption strengths corresponding to peak extinction coefficient values between 0.0027 and 0.081 were also conducted. Numerical results showed a maximum increase in the trap stiffness of 35 % , which is consistent with experimental results.

© 2009 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(160.4760) Materials : Optical properties

ToC Category:

Original Manuscript: June 26, 2009
Manuscript Accepted: August 26, 2009
Published: October 30, 2009

Virtual Issues
Vol. 4, Iss. 13 Virtual Journal for Biomedical Optics

M. J. Kendrick, D. H. McIntyre, and O. Ostroverkhova, "Wavelength dependence of optical tweezer trapping forces on dye-doped polystyrene microspheres," J. Opt. Soc. Am. B 26, 2189-2198 (2009)

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