Highly birefringent one-air-hole panda fiber

Area of Science:

• Photonics and Optical Engineering
• Materials Science
• Sensor Technology

Background:

• Traditional panda-type polarization-maintaining fibers (PMF) have limitations in birefringence.
• Enhanced light-matter interaction is crucial for improving sensor performance.
• Geometric asymmetry can be leveraged to increase fiber birefringence.

Purpose of the Study:

• To propose and demonstrate a highly birefringent one-air-hole panda fiber.
• To enhance birefringence and light-matter interaction for improved device applications.
• To investigate the potential of this fiber for optical fiber sensing.

Main Methods:

• Fabrication of the one-air-hole panda fiber by corroding a single stress zone of a traditional PMF.
• Inducing additional geometric asymmetry in the fiber structure.
• Theoretical analysis and experimental characterization of the fiber's birefringence and sensing capabilities.

Main Results:

• Achieved birefringence of the order of 10^-3, one order of magnitude higher than traditional PMF.
• The corroded region forms a microchannel suitable for functional material infiltration.
• Demonstrated a refractive index sensor with a sensitivity of 3760 nm/RIU using a salt solution.

Conclusions:

• The one-air-hole panda fiber offers significantly enhanced birefringence.
• The integrated microchannel enables the development of novel optical fiber sensors.
• This specialized fiber shows great promise for advanced sensor and device applications.