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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 16 — Aug. 2, 2010
  • pp: 17404–17411

Two-dimensional dielectrophoretic particle trapping in a hybrid crystal/PDMS-system

Michael Esseling, Frank Holtmann, Mike Woerdemann, and Cornelia Denz  »View Author Affiliations


Optics Express, Vol. 18, Issue 16, pp. 17404-17411 (2010)
http://dx.doi.org/10.1364/OE.18.017404


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Abstract

Dielectrophoretic forces originating from highly modulated electric fields can be used to trap particles on surfaces. An all-optical way to induce such fields is the use of a photorefractive material, where the fields that modulate the refractive index are present at the surface. We present a method for two-dimensional particle alignment on an optically structured photorefractive lithium niobate crystal. The structuring is done using an amplitude-modulating spatial light modulator and laser illumination. We demonstrate trapping of uncharged graphite particles in periodic and arbitrary patterns and provide a discussion of the limitations and the necessary boundary conditions for maximum trapping efficiency. The photorefractive crystal is utilized as bottom part of a PDMS channel in order to demonstrate two-dimensional dielectrophoretic trapping in a microfluidic system.

© 2010 OSA

OCIS Codes
(160.3730) Materials : Lithium niobate
(190.5330) Nonlinear optics : Photorefractive optics
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Trapping and Manipulation

History
Original Manuscript: May 4, 2010
Revised Manuscript: May 26, 2010
Manuscript Accepted: May 27, 2010
Published: July 30, 2010

Virtual Issues
Vol. 5, Iss. 12 Virtual Journal for Biomedical Optics

Citation
Michael Esseling, Frank Holtmann, Mike Woerdemann, and Cornelia Denz, "Two-dimensional dielectrophoretic particle trapping in a hybrid crystal/PDMS-system," Opt. Express 18, 17404-17411 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-16-17404


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