Wavelength dependence of optical tweezer trapping forces on dye-doped polystyrene microspheres
JOSA B, Vol. 26, Issue 11, pp. 2189-2198 doi:10.1364/JOSAB.26.002189
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- OCIS Codes:
- (140.7010) Lasers and laser optics : Laser trapping
- (160.4760) Materials : Optical properties
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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)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-26-11-2189
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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 μm 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 μm, 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
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History
Original Manuscript: June 26, 2009
Manuscript Accepted: August 26, 2009
Published: October 30, 2009
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Oregon State University
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