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Laser tweezing near resonance absorption

Publication ,  Conference
Agayan, RR; Schmidt, CF; Gittes, F; Kopelman, R
Published in: Proceedings of SPIE - The International Society for Optical Engineering
December 1, 2001

Expressions for radiation-induced forces are presented for the case of a Rayleigh particle at the focus of a Gaussian laser beam. Classical electromagnetic theory was used to obtain the dependence of the scattering and gradient forces on the incident laser frequency, beam convergence angle, and spatial position of the particle in the focus. Numerical analysis performed for particles with a single resonant absorption peak demonstrates the occurrence of enhanced trapping forces at near-resonant frequencies. An indication of the breakdown of the paraxial Gaussian approximation for large convergence angles is also shown by calculation of the scattering force. Use of this technique of gradient force enhancement may provide optical tweezers with enhanced trapping strengths and a degree of specificity.

Duke Scholars

Published In

Proceedings of SPIE - The International Society for Optical Engineering

DOI

ISSN

0277-786X

Publication Date

December 1, 2001

Volume

4431

Start / End Page

341 / 351
 

Citation

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Agayan, R. R., Schmidt, C. F., Gittes, F., & Kopelman, R. (2001). Laser tweezing near resonance absorption. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4431, pp. 341–351). https://doi.org/10.1117/12.447444
Agayan, R. R., C. F. Schmidt, F. Gittes, and R. Kopelman. “Laser tweezing near resonance absorption.” In Proceedings of SPIE - The International Society for Optical Engineering, 4431:341–51, 2001. https://doi.org/10.1117/12.447444.
Agayan RR, Schmidt CF, Gittes F, Kopelman R. Laser tweezing near resonance absorption. In: Proceedings of SPIE - The International Society for Optical Engineering. 2001. p. 341–51.
Agayan, R. R., et al. “Laser tweezing near resonance absorption.” Proceedings of SPIE - The International Society for Optical Engineering, vol. 4431, 2001, pp. 341–51. Scopus, doi:10.1117/12.447444.
Agayan RR, Schmidt CF, Gittes F, Kopelman R. Laser tweezing near resonance absorption. Proceedings of SPIE - The International Society for Optical Engineering. 2001. p. 341–351.

Published In

Proceedings of SPIE - The International Society for Optical Engineering

DOI

ISSN

0277-786X

Publication Date

December 1, 2001

Volume

4431

Start / End Page

341 / 351