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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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On-chip absorption spectroscopy enabled by graded index fiber tips.

Kamalpreet K Gill1,2, Nicolas Riesen1,2,3, Craig Priest1,2

  • 1Future Industries Institute and STEM, University of South Australia, Mawson Lakes, SA 5095, Australia.

Biomedical Optics Express
|March 4, 2021
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Summary

Miniaturized optofluidic devices integrate collimating optical fibers for enhanced sensing. This compact system enables sensitive absorption spectroscopy with minimal sample volume, reducing waste and improving efficiency.

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Area of Science:

  • Optofluidics
  • Optical Sensing
  • Microfluidics

Background:

  • Standard single-mode fiber (SMF) exhibits high beam divergence and insertion losses in fiber-channel-fiber interfaces.
  • Existing absorption spectroscopy methods often require large sample volumes (e.g., standard cuvettes).

Purpose of the Study:

  • To design and characterize miniaturized optofluidic devices for sensing applications.
  • To demonstrate the advantages of collimating graded-index fiber (GIF) tips over SMF for optofluidic integration.
  • To showcase the capability of the developed system for on-chip absorption spectroscopy with reduced sample volumes.

Main Methods:

  • Integration of collimating graded-index fiber (GIF) tips with custom microfluidic chips.
  • Characterization of beam divergence and insertion losses for GIF versus SMF interfaces over a 10.0 mm channel.
  • Demonstration of on-chip absorption spectroscopy for detecting Ponceau 4R dye and thiocyanate.

Main Results:

  • GIF configuration significantly reduced beam divergence and insertion losses compared to SMF.
  • Successful on-chip absorption spectroscopy measurements were performed using only 200 µL of solution.
  • Comparable sensitivity to standard cuvette-based methods was achieved with a substantially smaller sample volume.

Conclusions:

  • Miniaturized optofluidic devices utilizing GIF tips offer an effective solution for fiber-channel-fiber integration in sensing.
  • The developed system enables highly sensitive absorption spectroscopy with minimal sample consumption.
  • This approach is suitable for integration into compact lab-on-a-chip systems, eliminating the need for free-space optics.