Highly sensitive surface plasmon resonance temperature sensor based on a hollow core fiber multilayer structure.

Area of Science:

• Optoelectronics
• Nanotechnology
• Fiber Optics

Background:

• Surface Plasmon Resonance (SPR) is a label-free optical sensing technique.
• Hollow Core Fiber (HCF) offers unique properties for integrated optical devices.
• Accurate and sensitive temperature and refractive index sensing are crucial for many industries.

Purpose of the Study:

• To design and investigate a novel SPR temperature sensor based on HCF.
• To enhance the sensitivity of the SPR sensor using gold nanoparticles (AuNPs).
• To enable dual-parameter sensing (refractive index and temperature) with a single device.

Main Methods:

• Fabrication of a MMF-HCF-MMF structure.
• Deposition of Au film, AuNPs, and Polydimethylsiloxane (PDMS) onto the HCF.
• Theoretical and experimental analysis of SPR excitation and sensing performance.

Main Results:

• SPR effect was successfully excited with Au film, showing a sensitivity of (2200 ± 100) nm/RIU.
• Sensitivity was enhanced to (3100 ± 100) nm/RIU with the addition of AuNPs.
• PDMS coating enabled temperature sensing with a linear sensitivity of (-2.1 ± 0.1) nm/°C from 25 °C to 100 °C.

Conclusions:

• The developed HCF-SPR sensor demonstrates high sensitivity, stability, and repeatability.
• The sensor's design allows for dual-parameter measurement, expanding its application potential.
• This sensor shows significant promise for applications in medical treatment, environmental monitoring, and manufacturing.