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Proceedings Paper

Manipulation of microparticles with integrated optics
Author(s): Olav Gaute Helles; Katarina Grujic; J. Patrick Hole; Hitesh Jaising; James S. Wilkinson
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Paper Abstract

In a dielectric waveguide, the optical power is confined mostly in the core of the waveguide, where the refractive index is highest. Outside of the core the field is evanescent, i.e., the field strength decreases exponentially with the distance from the core. This evanescent field can be used to manipulate microparticles. For a particle with index of refraction higher than that of the surrounding medium (water), the optical forces due to the evanescent field act to guide the particle along the waveguide. The use of waveguides to trap particles combines the possibilities of conventional optical tweezers with the techniques employed in integrated optics, and it has the added advantage of integration of several functions on a single chip. We have experimentally observed size-dependent trapping and propulsion at velocities up to 33μm/s of polystyrene spheres, of diameters between 3 and 12μm, and in propulsion of 0.25μm diameter gold spheres at velocities up to 500μm/s. A Y-junction with a multimode input waveguide has been used to sort particles. By moving the input fibre relative to the input waveguide, the light goes into one of the two output branches. We have shown that this principle can be used to sort polystyrene microbeads. Recently we have used counter-propagating waves to move particles in both directions and also to stop a particle at a precise location. Experimental results and simulations for polystyrene microbeads, yeast cells and gold particles are presented.

Paper Details

Date Published: 24 February 2006
PDF: 10 pages
Proc. SPIE 6123, Integrated Optics: Devices, Materials, and Technologies X, 61230M (24 February 2006); doi: 10.1117/12.647325
Show Author Affiliations
Olav Gaute Helles, Univ. of Troms&slasho; (Norway)
Katarina Grujic, Univ. of Troms&slasho; (Norway)
J. Patrick Hole, Univ. of Southampton (United Kingdom)
Hitesh Jaising, Univ. of Troms&slasho; (Norway)
SINTEF Petroleum Research (Norway)
James S. Wilkinson, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 6123:
Integrated Optics: Devices, Materials, and Technologies X
Yakov Sidorin; Christoph A. Waechter, Editor(s)

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