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Micro flow modules with combined fluid flow channel and optical detection waveguide--hyper Rayleigh scattering as a

H Fouckhardt1, A Grosse, M Grewe

  • 1AG Integrierte Optoelektronik und Mikrooptik, FB Physik, Univ Kaiserslautern, Germany. fouckhar@physik.uni-kl.de

Fresenius' Journal of Analytical Chemistry
|October 27, 2001
PubMed
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Miniaturized optical detection modules enhance analytical sensitivity. Integrating fluid channels with optical waveguides improves detection limits by over 20x for hyper Rayleigh scattering (HRS) and enables simultaneous fluorescence detection.

Area of Science:

  • Analytical Chemistry
  • Optical Engineering
  • Materials Science

Background:

  • Micro fluidic devices offer advantages for miniaturized optical detection.
  • Optical waveguiding in micro channels typically requires "leaky" waveguiding due to refractive index differences.
  • Integration of fluidic and optical functions is key for enhanced analytical performance.

Purpose of the Study:

  • To develop micro flow modules with integrated optical waveguiding for enhanced detection.
  • To investigate the application of these modules in hyper Rayleigh scattering (HRS) and two-photon absorption (TPA) fluorescence measurements.
  • To adapt the micro flow module design for broader analytical applications, using capillary electrophoresis constraints.

Main Methods:

  • Fabrication of micro flow modules enabling optical waveguiding along the fluid channel.

Related Experiment Videos

  • Utilizing "leaky" optical waveguiding due to lower solution refractive index compared to the substrate.
  • Applying the modules to hyper Rayleigh scattering (HRS) measurements and simultaneous two-photon absorption (TPA) fluorescence detection.

    • Main Results:

    • Achieved a significant enhancement in detection limit for HRS, exceeding a factor of 20.
    • Demonstrated simultaneous detection of HRS and TPA fluorescence within the same micro flow module.
    • Validated the micro flow module design principles under the constraints of capillary electrophoresis.

    Conclusions:

    • Miniaturization of optical detection cells through integrated fluidic and waveguide functions significantly improves analytical sensitivity.
    • The developed micro flow modules are effective for sensitive HRS and TPA fluorescence detection.
    • The design approach is transferable to other micro-scale analytical techniques.