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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 5 — Mar. 5, 2007
  • pp: 2702–2712

Brownian diffusion of nano-particles in optical traps

T. J. Davis  »View Author Affiliations


Optics Express, Vol. 15, Issue 5, pp. 2702-2712 (2007)
http://dx.doi.org/10.1364/OE.15.002702


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Abstract

The effect of thermal-induced motion on nano-particles in optical traps is examined theoretically. We derive the steady-state probability density for particles trapped by evanescent waves above a surface. In particular we investigate the enhancement of the gradient force by surface plasmon resonance in a gold film and its application to trapping nano-particles in solution. An expression is derived for the lifetime of nano-particles in the trap in terms of the ratio of the trap energy to the thermal energy. It is shown that this ratio should be 10 or greater for the nano-particles to remain in the trap.

© 2007 Optical Society of America

OCIS Codes
(000.5490) General : Probability theory, stochastic processes, and statistics
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Trapping

History
Original Manuscript: October 20, 2006
Revised Manuscript: February 15, 2007
Manuscript Accepted: February 15, 2007
Published: March 5, 2007

Virtual Issues
Vol. 2, Iss. 4 Virtual Journal for Biomedical Optics

Citation
T. J. Davis, "Brownian diffusion of nano-particles in optical traps," Opt. Express 15, 2702-2712 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-5-2702


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