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Related Experiment Videos

Polymer waveguide backplanes for optical sensor interfaces in microfluidics.

Kevin S Lee1, Harry L T Lee, Rajeev J Ram

  • 1MIT, EECS, 32 Vassar St. 26-459, Cambridge, MA 02139, USA. kevbolee@mit.edu

Lab on a Chip
|October 26, 2007
PubMed
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A novel polymer optical backplane enables versatile luminescence detection in microfluidic chips. This integrated system uses low-loss waveguides for sensitive fluorescein and oxygen measurements, simplifying optical detection.

Area of Science:

  • Polymer optics
  • Microfluidics
  • Optical sensing

Background:

  • Microfluidic devices require efficient optical detection methods.
  • Integrating optical components with microfluidics presents integration challenges.

Purpose of the Study:

  • To demonstrate a polymer optical backplane for generic luminescence detection in microfluidic chips.
  • To enable independent design and integration of optical and fluidic components.

Main Methods:

  • Fabrication of large core polymer waveguides using mechanical machining, vapor polishing, and elastomer microtransfer molding.
  • Integration of vertical couplers and organic dye doping for wavelength-selective filtering.
  • Utilizing a backplane approach for optical integration with planar microfluidics.

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Main Results:

  • Achieved low waveguide loss (0.1 dB cm(-1)) and high numerical aperture (0.50).
  • Demonstrated fluorescein detection limit of 200 nM and oxygen detection limit of 0.08% (35 ppb).
  • Collected luminescence with efficiency comparable to a microscope objective and superior to fiber bundles.

Conclusions:

  • The polymer optical backplane provides a versatile platform for microfluidic luminescence sensing.
  • The approach simplifies optical integration and enhances detection capabilities for various analytes.
  • This technology facilitates sensitive and robust optical measurements in microfluidic systems.