Liquid-liquid fluorescent waveguides using microfluidic-drifting-induced hydrodynamic focusing

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We demonstrate fluorescent liquid-core/liquid-cladding (L (2)) waveguides focused in three-dimensional (3-D) space based on a 3-D hydrodynamic focusing technique. In the proposed system, the core and vertical cladding streams are passed through a curved 90A degrees corner in a microfluidic channel, leading to the formation of a pair of counter rotating vortices known as the Dean vortex. As a result, the core fluid is completely confined within the cladding fluid and does not touch the top and bottom poly(dimethylsiloxane) (PDMS) surfaces of the microfluidic channel. Because the core stream was not in contact with the PDMS channel, whose refractive index contrast and optical smoothness with the core fluid are lower than that between the core and the cladding fluids, the 3-D focused L (2) waveguide exhibited a higher captured fraction (eta) and lower propagation loss when compared to conventional two-dimensional (2-D) focused L (2) waveguides. Because the proposed 3-D focused L (2) waveguides can be generated in planar PDMS microfluidic devices, such optofluidic waveguides can be integrated with precise alignment together with other in-plane microfluidic and optical components to achieve micro-total analysis systems (mu-TAS).
Publisher
SPRINGER HEIDELBERG
Issue Date
2011-01
Language
English
Article Type
Article
Keywords

LIGHT-SOURCES; FABRICATION; MICROCHANNELS; TECHNOLOGY; DEVICE

Citation

MICROFLUIDICS AND NANOFLUIDICS, v.10, no.1, pp.211 - 217

ISSN
1613-4982
DOI
10.1007/s10404-010-0649-5
URI
http://hdl.handle.net/10203/100089
Appears in Collection
CBE-Journal Papers(저널논문)
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