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Proceedings Paper

Optical trapping efficiencies from n-phase cylindrical vector beams
Author(s): Brian J. Roxworthy; Kimani C. Toussaint
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Paper Abstract

We present the use of n - phase cylindrical vector beams in optical trapping. The vector beams are created via a Mach- Zehnder interferometer equipped with tunable phase plates, and the "n" prefix indicates the relative phase between the Hermite-Gaussian modes comprising the output beam. The optical trapping efficiency is measured via the Stokes drag force method for radial and azimuthal vector beams with n = 0 and π, giving a total of 4 unique input beams. Additionally, their trapping efficiencies are compared with that of a standard Gaussian input beam of equal input power. We find that the axial trapping efficiency can be optimized by increasing the amount of longitudinal (z) polarization at the focal plane of the trapping objective. Further, the lateral trapping efficiency is determined by the focal spot diameter, as expected, and can be similarly tuned by varying the relative phase between the vector beams' eigenmodes. The results suggest that cylindrical vector beams may be tuned such that both axial and lateral trapping efficiencies can be maximized.

Paper Details

Date Published: 16 February 2011
PDF: 7 pages
Proc. SPIE 7950, Complex Light and Optical Forces V, 79500X (16 February 2011); doi: 10.1117/12.875092
Show Author Affiliations
Brian J. Roxworthy, Lab. for Photonics Research of Bio/nano Environments (United States)
Univ. of Illinois at Urbana-Champaign (United States)
Kimani C. Toussaint, Lab. for Photonics Research of Bio/nano Environments (United States)
Univ. of Illinois at Urbana-Champaign (United States)
Beckman Laser Institute for Advanced Science and Technology (United States)


Published in SPIE Proceedings Vol. 7950:
Complex Light and Optical Forces V
David L. Andrews; Enrique J. Galvez; Jesper Glückstad, Editor(s)

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