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High-Sensitivity Surface Plasmon Resonance-Based D-Shape Photonic Crystal Fiber Temperature Sensor and Structural Simplification Scheme
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DOI：10.1007/s11468-026-03390-4.png)
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Abstract
En 中文
A surface plasmon resonance (SPR) based D-shaped photonic crystal fiber (DPCF) temperature sensor with a simplified structure is designed, analyzed, and optimized. The DPCF is fabricated by side-polishing a photonic crystal fiber (PCF) with periodic air holes arranged outside the Ge-doped core. An Al layer is deposited on the surface of an arc-shaped groove to excite SPR, and chloroform is placed on the outer DPCF for temperature detection. The finite element method (FEM) is employed to systematically optimize the structural parameters of the sensor, including the core size, the relative refractive index difference between the core and cladding, the distance between the core and the Al film, and the Al film thickness. The temperature sensitivity, resolution, and figure of merit (FOM) are investigated. A detectable temperature range of 25℃ to 90℃ and a maximum temperature sensitivity of 24.4 nm/℃ are achieved. The average temperature sensitivities are 13.62 nm/℃ and 4.66 nm/℃ within 25℃ ~ 50℃ and 50℃ ~ 90℃ respectively. In addition, the sensor structure is simplified by investigating the effects of the layer number, quantity, and size of the cladding air holes on the sensing properties. Featuring high sensitivity and low production difficulty, the DPCF-SPR temperature sensor has significant applications in industrial manufacturing and environmental monitoring.
Keywords:
Surface plasmon resonance
Optical fiber temperature sensor
Photonic crystal fiber
Sensitivity
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