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Optical sensing systems for microfluidic devices: a review.

Bambang Kuswandi1, Nuriman, Jurriaan Huskens

  • 1Chemo & Biosensors Group, School of Pharmacy, University of Jember, Jember 68121, Indonesia.

Analytica Chimica Acta
|October 9, 2007
PubMed
Summary
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Optical sensing systems for microfluidic devices, using on-chip or off-chip approaches, are reviewed. Sensor size and shape limit detection to picomolar levels due to analyte transport, not signal transduction.

Area of Science:

  • Analytical Chemistry
  • Optical Engineering
  • Biomedical Engineering

Background:

  • Microfluidic devices enable precise manipulation of small fluid volumes.
  • Optical sensing offers sensitive detection methods for various analytes.
  • Integrating optical sensing with microfluidics enhances analytical capabilities.

Purpose of the Study:

  • To review the application of optical sensing systems in microfluidic devices.
  • To discuss both "on-chip" and "off-chip" optical sensing approaches.
  • To assess the current progress and future directions in this field.

Main Methods:

  • Review of existing literature on optical sensing in microfluidics.
  • Analysis of "on-chip" (integrated micro-optics) and "off-chip" (external macro-optics) strategies.

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  • Evaluation of factors influencing detection limits, particularly sensor size and shape.

    • Main Results:

    • Optical sensing systems are effectively applied to microfluidic devices.
    • Sensor size and shape critically impact detection limits, primarily due to analyte transport limitations.
    • Micro- and nanoscale sensors achieve picomolar-order detection limits within practical timeframes.

    Conclusions:

    • Optical sensing is a key technology for advanced microfluidic applications.
    • Future research should focus on overcoming analyte transport limitations for improved sensitivity.
    • Further integration of optical functions into microfluidic devices holds significant potential.