Highly Sensitive Wide Detection Range Semicircular Convex Slot PCF Temperature Sensor Based on Surface Plasmon Resonance
Qingcheng You, Honggang Pan, Zihong Zhao, Yukun Zhu, Yichen Li, Bin Li
Abstract
In this study, a novel semicircular convex groove photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) is designed to achieve high-precision temperature measurements in the near-infrared (NIR) range using gold as the plasmon material. Finite element numerical simulations show that the PCF-SPR sensor can obtain a temperature detection range of 16 °C–130 °C when the y-polarization (Y-pol) fundamental mode is coupled with the surface plasmon polariton (SPP) mode. The maximum wavelength sensitivity (WS) obtained is 41.5 nm/°C, the optimum resolution is <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$2.4\times \,\, 10^{-{3}}~^{\circ }$ </tex-math></inline-formula>C, and the maximum figure of merit (FOM) is 0.1663 °C−1. When the x-polarization (X-pol) fundamental mode is coupled with the SPP mode. The PCF-SPR sensor achieves a temperature detection range of −25 °C to 80 °C. The maximum WS obtained is 2.74 nm/°C, the optimum resolution is <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$3.65\times \,\, 10^{-{2}}~^{\circ }$ </tex-math></inline-formula>C, and the maximum FOM is 0.05007 °C−1. Thus, the sensor is highly competitive in the aerospace industry for temperature monitoring of cooling systems and cabin environments, as well as chemical reactions such as polymerization, solvent evaporation, and crystallization.