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Fiber-optic fluorescence correlation spectrometer.

Kanchan Garai1, Mohan Muralidhar, Sudipta Maiti

  • 1Tata Institute of Fundamental Research, Colaba, Mumbai, India.

Applied Optics
|September 20, 2006
PubMed
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We developed a compact fluorescence correlation spectroscopy (FCS) method using optical fibers. This technique maintains high sensitivity for analyzing dilute solutions, enabling potential remote and in vivo applications.

Area of Science:

  • Spectroscopy
  • Optics
  • Biophysics

Background:

  • Fluorescence correlation spectroscopy (FCS) is a powerful technique for analyzing molecular properties in solution.
  • Conventional FCS systems often require bulky and complex optical setups, limiting their portability and application scope.

Purpose of the Study:

  • To develop a miniaturized FCS system using a single-mode optical fiber.
  • To assess the sensitivity and accuracy of the fiber-based FCS technique for probing molecular characteristics.

Main Methods:

  • Utilized a single-mode optical fiber with a 3.3 micrometer mode field diameter for FCS measurements.
  • Performed FCS experiments on fluorescent beads with a 13 nm radius to validate the technique's performance.

Main Results:

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  • Demonstrated that the fiber-based FCS technique achieves adequate sensitivity for analyzing small fluorescent particles.
  • Obtained results consistent with theoretical predictions, confirming the method's accuracy.

Conclusions:

  • The developed optical fiber-based FCS method offers a compact and sensitive alternative to conventional spectrometers.
  • This approach has the potential to expand FCS applications into remote sensing and in vivo measurements.