Increased sensitivity in fiber-based spectroscopy using carbon-coated fiber.

Area of Science:

• Spectroscopy
• Materials Science
• Analytical Chemistry

Background:

• Fiber-based spectroscopy systems often suffer from high luminescence background noise originating from primary coatings.
• This background noise significantly limits the sensitivity and applicability of these systems, particularly for trace analysis or low-signal applications.

Purpose of the Study:

• To investigate the use of carbon-coated optical fibers for reducing luminescence background.
• To enhance the sensitivity of fiber-based spectroscopy systems.
• To assess the feasibility of using these modified fibers as Raman probes for organic solvent identification.

Main Methods:

• Standard telecom optical fibers were coated with carbon.
• The performance of carbon-coated fibers was evaluated in a spectroscopy system, focusing on luminescence background reduction.
• Signal-to-noise ratio (SNR) improvements were quantified.
• The utility of carbon-coated fibers as Raman probes was tested for identifying organic solvents.

Main Results:

• Carbon coating effectively reduced the luminescence background generated by the primary fiber coating.
• A significant improvement in signal-to-noise ratio (2-3 orders of magnitude) was achieved with standard telecom fibers.
• The enhanced SNR demonstrated the suitability of these fibers for use as Raman probes.

Conclusions:

• Carbon-coated optical fibers offer a viable method for significantly reducing luminescence background in spectroscopy.
• The substantial SNR improvement allows standard telecom fibers to be effectively utilized as Raman probes.
• This advancement opens new possibilities for sensitive and cost-effective fiber-based spectroscopic analysis, particularly for organic solvent identification.