期刊
OPTICS COMMUNICATIONS
卷 197, 期 4-6, 页码 239-245出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0030-4018(01)01479-1
关键词
optical tweezers; particles; guiding; alignment; manipulation; Bessel beam
类别
We demonstrate a technique for optical manipulation of micron-sized particles, including biological samples, using a zeroth-order Bessel light beam. The central maximum of such a beam offers a non-diffracting focal line of light. This line focus is well suited to rotationally align rod-like particles along the beam direction and to build stacks of particles. We have stacked up to nine 5 mum spheres above one another and manipulated this particle chain as a whole, Furthermore, we have observed laser guiding (transport) of 1 mum particles along the Bessel beam axis over 1 mm, which is over 10 times the Rayleigh range for a comparable Gaussian beam. (C) 2001 Elsevier Science B.V. All rights reserved.
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