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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 12 — Apr. 20, 2002
  • pp: 2318–2327

Optical trapping near resonance absorption

Rodney R. Agayan, Frederick Gittes, Raoul Kopelman, and Christoph F. Schmidt  »View Author Affiliations


Applied Optics, Vol. 41, Issue 12, pp. 2318-2327 (2002)
http://dx.doi.org/10.1364/AO.41.002318


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Abstract

Expressions for radiation-induced forces are presented for the case of a Rayleigh particle near the focus of a Gaussian laser beam at near-resonant conditions. Classical electromagnetic theory was used to obtain the dependence of the scattering and gradient forces on the incident laser frequency, the beam convergence angle, and the spatial position of the particle with respect to the focus. Approximative numerical analysis performed for particles with a single resonant absorption peak demonstrates the occurrence of up to 50-fold enhanced trapping forces at near-resonant frequencies. The use of this technique of gradient force enhancement may provide optical tweezers with enhanced trapping strengths and a degree of specificity.

© 2002 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(160.4760) Materials : Optical properties
(170.0180) Medical optics and biotechnology : Microscopy
(260.2030) Physical optics : Dispersion
(260.2110) Physical optics : Electromagnetic optics
(260.5740) Physical optics : Resonance

Citation
Rodney R. Agayan, Frederick Gittes, Raoul Kopelman, and Christoph F. Schmidt, "Optical trapping near resonance absorption," Appl. Opt. 41, 2318-2327 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-12-2318


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