Random-hole optical fiber evanescent-wave gas sensing

Area of Science:

• Photonics and Optical Sensing
• Materials Science
• Analytical Chemistry

Background:

• Optical gas sensors offer sensitive detection methods.
• Evanescent-wave absorption is a key principle for fiber-based sensing.
• Development of specialized optical fibers is crucial for advanced sensor applications.

Purpose of the Study:

• To develop and demonstrate optical gas sensors utilizing random-hole optical fibers.
• To investigate the detection of gases via evanescent-wave absorption within fiber pores.
• To establish a novel method for gas sensing using a unique fiber fabrication technique.

Main Methods:

• Fabrication of random-hole optical fibers using an in situ bubble formation technique.
• Utilizing the evanescent field of guided modes within the fiber's pore region for gas interaction.
• Experimental setup designed for detecting gas-induced absorption losses in the near-infrared spectrum.

Main Results:

• Successfully detected gas molecules with characteristic vibrational absorption lines in the near-infrared region.
• Observed gas presence as wavelength-specific optical loss corresponding to the gas species.
• Demonstrated acetylene gas detection, showing characteristic spectral absorptions in the experimental setup.

Conclusions:

• Random-hole optical fibers can be effectively used for evanescent-wave gas sensing.
• The novel fabrication technique enables the creation of fibers suitable for gas detection applications.
• This work represents a pioneering report on gas sensing using random-hole optical fibers.