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Proceedings Paper

Laser beam interference and its applications in optical micromanipulation
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Paper Abstract

Optical interference of two or more waves with different wave vectors generates a periodic, harmonic spatial profile of the optical intensity. This well known property combined with mechanical effect of light offers an excellent route to organize and manipulate large ensembles of microobjects in a controllable manner. Since the sub-micron size objects dispersed in liquid suffer from Brownian motion,such fields may assist to control its influence at will. In our experiments the periodic field is obtained by interference of co-propagating non-diffracting beams and counter-propagating non-diffracting and even evanescent fields. These types of trapping fields enable spatial organization of submicrometer-sized objects into one-dimensional arrays containing even thousands of objects, their controlled delivery over a distance of 1 mm, their sorting according to the size of refractive index. Moreover, the particle tracking enables to study the Brownian dynamics, jumps between neighboring optical traps and interactions between the objects.

Paper Details

Date Published: 12 September 2008
PDF: 11 pages
Proc. SPIE 7062, Laser Beam Shaping IX, 70620U (12 September 2008); doi: 10.1117/12.794523
Show Author Affiliations
Tomáš Čižmár, Institute of Scientific Instruments (Czech Republic)
Univ. of St. Andrews (United Kingdom)
Pavel Zemánek, Institute of Scientific Instruments (Czech Republic)
Martin Šiler, Institute of Scientific Instruments (Czech Republic)
Veneranda Garcés-Chávez, Univ. of St. Andrews (United Kingdom)
Kishan Dholakia, Univ. of St. Andrews (United Kingdom)
Věra Kollárová, Palacky Univ. (Czech Republic)
Zdeněk Bouchal, Palacky Univ. (Czech Republic)

Published in SPIE Proceedings Vol. 7062:
Laser Beam Shaping IX
Andrew Forbes; Todd E. Lizotte, Editor(s)

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