Optical manipulation of single electrically charged biological particles

Yong-Qing Li; Changan Xie; Mumtaz A. Dinno

doi:10.1117/12.468342

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28 May 2002 Optical manipulation of single electrically charged biological particles

Yong-Qing Li, Changan Xie, Mumtaz A. Dinno

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Proceedings Volume 4622, Optical Diagnostics of Living Cells V; (2002) https://doi.org/10.1117/12.468342
Event: International Symposium on Biomedical Optics, 2002, San Jose, CA, United States

Abstract

In this paper, we study optical trapping and manipulation of single electrically charged colloidal particles. We measured the dynamic motion of a charged particle captured in a linearly polarized optical trap. We found that the position's fluctuation of a trapped particle in the parallel direction to the lase polarization is larger than that in the normal direction to the polarization, which suggests that there exists an additional electric force parallel to the laser polarization direction exerting on the charged particle beside the known radiation forces on the dielectric particle. This asymmetry in dynamic motion is significant when the particle size is less than the wavelength of the trapping laser. We present both the theoretical and experimental results.

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Yong-Qing Li, Changan Xie, and Mumtaz A. Dinno "Optical manipulation of single electrically charged biological particles", Proc. SPIE 4622, Optical Diagnostics of Living Cells V, (28 May 2002); https://doi.org/10.1117/12.468342

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