Advancing Sensing Layers for High-Temperature Optical Fibers Using Atomic Layer Deposition

University of Pittsburgh researchers have developed a groundbreaking technology that utilizes atomic layer deposition (ALD) to create high-quality, nanometer-scale thin film coatings on silica optical fibers. This technology enhances the functionality and durability of optical fiber-based sensors, particularly in high-temperature and harsh environments. By integrating oxide-based sensing layers with the optical fiber platform using an evanescent field sensing approach, the technology allows for real-time monitoring of ambient conditions through precise optical responses.

Description

Optical fiber sensors offer unique advantages in extreme conditions, such as those encountered in chemical reactors, solid oxide fuel cells, and high-temperature gas streams. However, conventional coatings often degrade under such conditions. The ALD process addresses these challenges by providing uniform, conformal coatings that enhance the stability and performance of optical fibers, enabling accurate sensing even in environments with temperatures approaching 800°C.

Applications

- High-Temperature Industrial Processes
- Industrial Process Control

Advantages

The ALD-coated optical fibers provide several key advantages. The technology enables the creation of uniform, conformal coatings that enhance the stability and durability of optical fibers in challenging environments. These coatings are compatible with high-temperature applications and resistant to degradation in non-ambient gas atmospheres, making them ideal for long-term use in industrial settings. Additionally, the ability to incorporate functional nanoparticles into the coatings opens up opportunities for advanced sensing capabilities, such as plasmonic responses and multi-wavelength monitoring. This versatility makes the technology suitable for a wide range of applications, from high-temperature sensing to advanced optical characterization.

Invention Readiness

Researchers have demonstrated that ALD-coated silica fibers can maintain their optical performance and structural integrity at temperatures as high as 800°C, far exceeding the capabilities of conventional coatings. The coatings have been tested for their ability to enhance the stability of optical fiber transmission over time, even in chemically aggressive environments. The addition of functional nanoparticles has been shown to further expand the sensing capabilities, allowing for multi-parameter monitoring in real-time. The technology is now ready for further development and commercialization, with ongoing efforts focused on optimizing the coating process and exploring additional applications in high-temperature and harsh environment sensing.

IP Status

https://patents.google.com/patent/US11782210B2