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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 29, Iss. 7 — Jul. 1, 2012
  • pp: 1224–1236

Optical alignment and confinement of an ellipsoidal nanorod in optical tweezers: a theoretical study

Jan Trojek, Lukáš Chvátal, and Pavel Zemánek  »View Author Affiliations


JOSA A, Vol. 29, Issue 7, pp. 1224-1236 (2012)
http://dx.doi.org/10.1364/JOSAA.29.001224


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Abstract

Within the Rayleigh approximation, we investigate the behavior of an individual ellipsoidal metal nanorod that is optically confined in three dimensions using a single focused laser beam. We focus on the description of the optical torque and optical force acting upon the nanorod placed into a linearly polarized Gaussian beam (scalar description of the electric field) or a strongly focused beam (vector field description). The study comprises the influence of the trapping laser wavelength, the angular aperture of focusing optics, the orientation of the ellipsoidal nanorod, and the aspect ratio of its principal axes. The results reveal a significantly different behavior of the nanorod if the trapping wavelength is longer or shorter than the wavelength corresponding to the longitudinal plasmon resonance mode. Published experimental observations are compared with our theoretical predictions with satisfactory results.

© 2012 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: December 6, 2011
Revised Manuscript: February 19, 2012
Manuscript Accepted: March 9, 2012
Published: June 6, 2012

Virtual Issues
Vol. 7, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Jan Trojek, Lukáš Chvátal, and Pavel Zemánek, "Optical alignment and confinement of an ellipsoidal nanorod in optical tweezers: a theoretical study," J. Opt. Soc. Am. A 29, 1224-1236 (2012)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-29-7-1224


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