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19 Sep 2005

Volume 87, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 87, 123111 (2005); http://dx.doi.org/10.1063/1.2053370 (3 pages)

Xianghui Zhang, Ye Zhang, Jun Xu, Zhe Wang, Xihong Chen, Dapeng Yu, Peng Zhang, Hanhong Qi, and Yongjun Tian
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Light-induced cell separation in a tailored optical landscape

L. Paterson, E. Papagiakoumou, G. Milne, V. Garcés-Chávez, S. A. Tatarkova, W. Sibbett, F. J. Gunn-Moore, P. E. Bryant, A. C. Riches, and K. Dholakia

Appl. Phys. Lett. 87, 123901 (2005); http://dx.doi.org/10.1063/1.2045548 (3 pages) | Cited 47 times

Online Publication Date: 13 September 2005

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We demonstrate passive optical sorting of cell populations in the absence of any externally driven fluid flow. Specifically, we report the movement of erythrocytes and lymphocytes in an optical landscape, consisting of a circularly symmetric light pattern created by a Bessel light beam. These distinct cell populations move, spontaneously and differentially, across the underlying periodic optical landscape. Thus, we were able to separate lymphocytes from a mixed population of cells containing erythrocytes and then collect the lymphocytes in a microcapillary reservoir. We also demonstrate an enhanced form of this separation that exploits the polarizability of silica microspheres by attaching spheres coated with antibodies to cell surface markers to a subpopulation of lymphocytes. These techniques may be applied using standard laboratory apparatus.
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87.50.W- Optical/infrared radiation effects
87.80.Cc Optical trapping
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