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Trapping volume control in optical tweezers using cylindrical vector beams |
Optics Letters, Vol. 38, Issue 1, pp. 28-30 (2013)
http://dx.doi.org/10.1364/OL.38.000028
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Abstract
We present the result of an investigation into the optical trapping of spherical microparticles using laser beams with a spatially inhomogeneous polarization direction [cylindrical vector beams (CVBs)]. We perform three-dimensional tracking of the Brownian fluctuations in the position of a trapped particle and extract the trap spring constants. We characterize the trap geometry by the aspect ratio of spring constants in the directions transverse and parallel to the beam propagation direction and evaluate this figure of merit as a function of polarization angle. We show that the additional degree of freedom present in CVBs allows us to control the optical trap strength and geometry by adjusting only the polarization of the trapping beam. Experimental results are compared with a theoretical model of optical trapping using CVBs derived from electromagnetic scattering theory in the T-matrix framework.
© 2012 Optical Society of America
OCIS Codes
(260.5430) Physical optics : Polarization
(350.4855) Other areas of optics : Optical tweezers or optical manipulation
ToC Category:
Physical Optics
History
Original Manuscript: October 3, 2012
Revised Manuscript: November 17, 2012
Manuscript Accepted: November 30, 2012
Published: December 21, 2012
Virtual Issues
Vol. 8, Iss. 2 Virtual Journal for Biomedical Optics
Citation
S. E. Skelton, M. Sergides, R. Saija, M. A. Iatì, O. M. Maragó, and P. H. Jones, "Trapping volume control in optical tweezers using cylindrical vector beams," Opt. Lett. 38, 28-30 (2013)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-38-1-28
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