White Paper: Optofluidic Trapping And Transport On Solid Core Waveguides Within A Microfluidic Device
Source: Optical Society Of America (OSA)
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 pressuredriven
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.
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