Radiation forces of anomalous hollow beams on a Rayleigh particle

Yu-Na Liu; Xuan-hui Lu; Cheng-Liang Zhao

doi:10.1117/12.837992

1 December 2009 Radiation forces of anomalous hollow beams on a Rayleigh particle

Yu-Na Liu, Xuan-hui Lu, Cheng-Liang Zhao

Proceedings Volume 7507, 2009 International Conference on Optical Instruments and Technology: Optical Trapping and Microscopic Imaging; 750709 (2009) https://doi.org/10.1117/12.837992
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

The radiation force on a Rayleigh dielectric sphere induced by focused anomalous hollow beams is investigated theoretically. The results show that the highly focused anomalous hollow beam can be used to trap and manipulate the particles with the refractive index larger than that of ambient at the focus point, and in the neighborhood of the focal plane simultaneously, it appears two equilibrium points along transverse direction at the focus plane in the neighborhood of the focus point, but it cannot stably trap the particles owing to the longitudinal gradient force which could not act as a restoring force at the corresponding position. And in the neighborhood of the focus plane there also exist three equilibrium points along transverse direction. It is further found that there exist two equilibrium points off axis position along longitudinal direction. Finally, the stability conditions for trapping particles are also discussed.

Citation Download Citation

Yu-Na Liu, Xuan-hui Lu, and Cheng-Liang Zhao "Radiation forces of anomalous hollow beams on a Rayleigh particle", Proc. SPIE 7507, 2009 International Conference on Optical Instruments and Technology: Optical Trapping and Microscopic Imaging, 750709 (1 December 2009); https://doi.org/10.1117/12.837992

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