Heat-resistant flexible-film optical waveguides from fluorinated polyimides

Area of Science:

• Materials Science
• Optoelectronics
• Polymer Science

Background:

• Optical waveguides are crucial components in telecommunications and integrated optics.
• Developing materials with high thermal stability, flexibility, and low optical loss is essential for advanced photonic devices.

Purpose of the Study:

• To fabricate and characterize heat-resistant, flexible-film optical waveguides using fluorinated polyimides.
• To evaluate the optical performance, flexibility, and environmental stability of these novel waveguides.

Main Methods:

• Fabrication of flexible-film optical waveguides from fluorinated polyimides.
• Measurement of optical loss at 1.3 microm for TE and TM polarizations.
• Assessment of optical loss changes with varying radius of curvature to determine flexibility.
• Evaluation of thermal stability by heating to 420°C and moisture resistance by exposure to 85% relative humidity at 85°C.

Main Results:

• Single-mode operation with low optical loss (0.3 dB/cm) at 1.3 microm.
• Minimal change in optical loss for radii of curvature below 20 mm, indicating good flexibility.
• Significantly low birefringence (9 x 10⁻⁵) compared to substrate-based waveguides.
• Exceptional thermal stability and moisture resistance, with stable performance after prolonged high-temperature and humidity exposure.

Conclusions:

• Fluorinated polyimides are promising materials for fabricating high-performance, heat-resistant, and flexible optical waveguides.
• These waveguides demonstrate excellent optical properties and environmental stability, suitable for demanding applications in optoelectronics.