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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 33, Iss. 17 — Sep. 1, 2008
  • pp: 2017–2019

Spring constant modulation in a zone plate tweezer using linear polarization

E. Schonbrun and K. B. Crozier  »View Author Affiliations

Optics Letters, Vol. 33, Issue 17, pp. 2017-2019 (2008)

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At large NAs a micro-Fresnel zone plate produces a focal spot that is more elliptical than that produced by an objective lens with the same NA. Using this anisotropy we demonstrate a method for modulating the spring constant of an optical trap by rotating the linear input polarization. The focal spot ellipticity is enhanced by the apodization factor of the zone plate and its extremely high NA. By measuring the positions of trapped particles we obtain two-dimensional histograms of particle position. These indicate that the trap spring constant is 2.75 times larger perpendicular to the incident polarization than along it. The elliptical focal spot distribution can be rotated by rotating the incident polarization, allowing the spring constant along a given direction to be modulated.

© 2008 Optical Society of America

OCIS Codes
(220.1230) Optical design and fabrication : Apodization
(050.1965) Diffraction and gratings : Diffractive lenses
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Design and Fabrication

Original Manuscript: May 6, 2008
Revised Manuscript: July 20, 2008
Manuscript Accepted: July 25, 2008
Published: August 29, 2008

Virtual Issues
Vol. 3, Iss. 11 Virtual Journal for Biomedical Optics

E. Schonbrun and K. B. Crozier, "Spring constant modulation in a zone plate tweezer using linear polarization," Opt. Lett. 33, 2017-2019 (2008)

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