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Proceedings Paper

Revisiting transverse optical binding
Author(s): Jörg Baumgartl; Andrew P. Rudhall; Michael Mazilu; Ewan Wright; Kishan Dholakia
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Paper Abstract

In their pioneering work, Burns et al. [Phys. Rev. Lett. 63, 1233 (1989)] discovered a laser-induced optical interaction between dielectric microparticles dispersed in water. This interaction occurred in the plane transversal to the laser beam and, interestingly, induced bound pairs of particles. Accordingly, the observed phenomenon was termed "transverse optical binding" (TOB). Burns et al. argued that TOB arises from coherently induced electric dipoles in the microspheres. Indeed, this explanation verified the experimental observation that the spatial periodicity of the TOB interaction matched the laser wavelength in water. However, relatively little experimental evidence has been provided, to date, for both the strength and functional dependence of this effect on the particle distance. In our study, we used an experimental method which allowed us to directly measure the TOB interaction. As a result, we found that this interaction is surprisingly long-ranged.

Paper Details

Date Published: 20 August 2009
PDF: 10 pages
Proc. SPIE 7400, Optical Trapping and Optical Micromanipulation VI, 74001D (20 August 2009); doi: 10.1117/12.826189
Show Author Affiliations
Jörg Baumgartl, Univ. of St. Andrews (United Kingdom)
Andrew P. Rudhall, Univ. of St. Andrews (United Kingdom)
Michael Mazilu, Univ. of St. Andrews (United Kingdom)
Ewan Wright, College of Optical Sciences, The Univ. of Arizona (United States)
Kishan Dholakia, Univ. of St. Andrews (United Kingdom)

Published in SPIE Proceedings Vol. 7400:
Optical Trapping and Optical Micromanipulation VI
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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