Perfluorinated plastic optical fiber tapers for evanescent wave sensing

Area of Science:

• Materials Science
• Optical Engineering
• Biomedical Sensing

Background:

• Optical fiber tapers are crucial for evanescent wave sensing applications.
• Perfluorinated polymers offer unique optical properties for enhanced light-matter interactions.
• Developing robust fabrication methods for specialized optical fibers is essential for advanced sensing.

Purpose of the Study:

• To fabricate and characterize perfluorinated plastic-cladded optical fiber tapers.
• To evaluate the suitability of these tapers for evanescent wave sensing in aqueous environments.
• To demonstrate the sensitivity of the fabricated tapers using specific analytes.

Main Methods:

• Fabrication of symmetric optical fiber tapers using a heat-and-pull technique.
• Characterization of taper geometry and refractive index (n=1.35-1.34).
• Evanescent field absorbance measurements with methylene blue and fluorescence collection with Cy5 dye in aqueous solutions (n=1.33).

Main Results:

• Successfully fabricated perfluorinated plastic-cladded optical fiber tapers with repeatable results.
• Demonstrated strong enhancement of evanescent wave power fraction in aqueous environments due to low refractive index.
• Achieved good sensitivity in sensing applications, linked to low refractive index and taper geometry.

Conclusions:

• Perfluorinated plastic-cladded optical fiber tapers are effectively fabricated using a heat-and-pull method.
• The low refractive index of these materials significantly enhances evanescent wave sensing capabilities in water.
• These tapers show promise for sensitive and efficient evanescent wave-based detection systems.