Laser tweezing near resonance absorption

Rodney R. Agayan; Christoph F. Schmidt; Fred Gittes; Raoul Kopelman

doi:10.1117/12.447444

2 November 2001 Laser tweezing near resonance absorption

Rodney R. Agayan, Christoph F. Schmidt, Fred Gittes, Raoul Kopelman

Proceedings Volume 4431, Photon Migration, Optical Coherence Tomography, and Microscopy; (2001) https://doi.org/10.1117/12.447444
Event: European Conferences on Biomedical Optics, 2001, Munich, Germany

Abstract

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.

Citation Download Citation

Rodney R. Agayan, Christoph F. Schmidt, Fred Gittes, and Raoul Kopelman "Laser tweezing near resonance absorption", Proc. SPIE 4431, Photon Migration, Optical Coherence Tomography, and Microscopy, (2 November 2001); https://doi.org/10.1117/12.447444

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available