Extended-area optically induced organization of microparticles on a surface

To extend beyond the limited field of view associated with optical tweezers, we implement a new geometry for lensless optical trapping ("LOT"). A Ronchi ruling is imaged at a sample interface beyond the critical angle for total internal reflection imposing local structure upon the optical...

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Bibliographic Details
Published in:Applied physics letters 2005-01, Vol.86 (3), p.031106-031106-3
Main Authors: Garcés-Chávez, V., Dholakia, K., Spalding, G. C.
Format: Article
Language:English
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Summary:To extend beyond the limited field of view associated with optical tweezers, we implement a new geometry for lensless optical trapping ("LOT"). A Ronchi ruling is imaged at a sample interface beyond the critical angle for total internal reflection imposing local structure upon the optical fields. Due to the resulting transverse optical gradients, more than one thousand microparticles spanning 1 mm 2 were organized into microchannels that are entirely optical in origin. A generalized approach is presented, allowing for either guiding or stable trapping, as a function of the relative intensity of the counterpropagating surface waves.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1843283