Optical trapping near resonance absorption.

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Agayan, RR; Gittes, F; Kopelman, R; Schmidt, CF

Published Date

  • April 2002

Published In

Volume / Issue

  • 41 / 12

Start / End Page

  • 2318 - 2327

PubMed ID

  • 12003226

Pubmed Central ID

  • 12003226

Electronic International Standard Serial Number (EISSN)

  • 1539-4522

International Standard Serial Number (ISSN)

  • 1559-128X

Digital Object Identifier (DOI)

  • 10.1364/ao.41.002318


  • eng