Abstract

In this work we demonstrate an integrated microfluidic/photonic architecture for performing dynamic optofluidic trapping and transport of particles in the evanescent field of solid core waveguides. Our architecture consists of SU-8 polymer waveguides combined with soft lithography defined poly(dimethylsiloxane) (PDMS) microfluidic channels. The forces exerted by the evanescent field result in both the attraction of particles to the waveguide surface and propulsion in the direction of optical propagation both perpendicular and opposite to the direction of pressure-driven flow. Velocities as high as 28 μm/s were achieved for 3 μm diameter polystyrene spheres with an estimated 53.5 mW of guided optical power at the trapping location. The particle-size dependence of the optical forces in such devices is also characterized.

© 2007 Optical Society of America

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History
Original Manuscript: August 6, 2007
Manuscript Accepted: September 27, 2007
Revised Manuscript: September 25, 2007
Published: October 15, 2007

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Author Affiliations

Bradley S. Schmidt, Allen H. Yang, David Erickson, Michal Lipson

Cornell University

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