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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 7 — Mar. 31, 2008
  • pp: 4991–4999

Optical vortex trap for resonant confinement of metal nanoparticles

Maria Dienerowitz, Michael Mazilu, Peter J. Reece, Thomas F. Krauss, and Kishan Dholakia  »View Author Affiliations


Optics Express, Vol. 16, Issue 7, pp. 4991-4999 (2008)
http://dx.doi.org/10.1364/OE.16.004991


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Abstract

The confinement and controlled movement of metal nanoparticles and nanorods is an emergent area within optical micromanipulation. In this letter we experimentally realise a novel trapping geometry near the plasmon resonance using an annular light field possessing a helical phasefront that confines the nanoparticle to the vortex core (dark) region. We interpret our data with a theoretical framework based upon the Maxwell stress tensor formulation to elucidate the total forces upon nanometric particles near the particle plasmon resonance. Rotation of the particle due to orbital angular momentum transfer is observed. This geometry may have several advantages for advanced manipulation of metal nanoparticles.

© 2008 Optical Society of America

OCIS Codes
(140.3300) Lasers and laser optics : Laser beam shaping
(140.7010) Lasers and laser optics : Laser trapping
(240.6680) Optics at surfaces : Surface plasmons
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Trapping and Manipulation

History
Original Manuscript: February 22, 2008
Revised Manuscript: March 23, 2008
Manuscript Accepted: March 24, 2008
Published: March 27, 2008

Virtual Issues
Vol. 3, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Maria Dienerowitz, Michael Mazilu, Peter J. Reece, Thomas F. Krauss, and Kishan Dholakia, "Optical vortex trap for resonant confinement of metal nanoparticles," Opt. Express 16, 4991-4999 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-7-4991


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