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Sorting of polystyrene microspheres using a Y-branched optical waveguide

K. Grujic, O. G. Hellesø, J. P. Hole, and J. S. Wilkinson

Open Access Open Access

Abstract

We demonstrate how a Y-branched optical waveguide can be used for microparticle sorting. Polystyrene microparticles, optically guided in the waveguide’s evanescent field, are directed down the desired, more strongly illuminated, output branch. The output of a fibre laser at a wavelength of 1066 nm is coupled to the waveguide by direct butting. The power distribution between the two output branches is selected by the relative position of the fibre to the waveguide input facet. This provides a simple method for reliable particle sorting with very high probability of success under appropriate conditions. The method can be easily combined with other particle manipulation techniques of interest for micro total analysis systems of the future.

©2005 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. (a) Experimental setup used for particle sorting. (b) Diagram of the waveguide junction region.

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Fig. 2.
Fig. 2. Output powers of the upper and lower branches of the Y-branched waveguide as a function of the fibre position relative to the waveguide input facet. Fibre output power was about 165 mW.

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Fig. 3.
Fig. 3. Particle distribution between the upper and the lower waveguide branch with respect to the output power of the two branches at the time when the particle is in the junction region. Fibre output power was about 165 mW.

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Fig. 4.
Fig. 4. Output power of the upper and the lower branches of the Y-branched waveguide as the fibre is flipped between the two chosen positions. Fibre output power was about 165 mW.

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Fig. 5.
Fig. 5. Movie (2.0 MB) of the sorting of polystyrene microspheres above a Y-branched waveguide. The aspect ratio has been changed for convenience, thus the spheres appear elliptical.

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