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<p>To address the urgent demand for ultrasensitive low-temperature measurement technology, a novel D-shaped photonic crystal fiber (PCF) low-temperature sensor is proposed in this study. Based on the surface plasmon resonance (SPR) effect, the sensor adopts a silver nanofilm as the excitation layer and polydimethylsiloxane (PDMS) as the temperature-sensitive material for accurate temperature measurement. The finite element method (FEM) is adopted to simulate and optimize key parameters, including silver nanofilm thickness, polishing depth, and semi-axial dimensions of the elliptical air holes. Simulation results show that at -35℃ to 0℃, the average wavelength sensitivity of the x-polarized mode is 15.36 ~ 17.54&#xa0;nm/℃ within the 1200 ~ 2500&#xa0;nm band, and the value reaches 16.50 ~ 18.49&#xa0;nm/℃ for the y-polarized mode in the 1200 ~ 2700&#xa0;nm band. Featuring both high sensitivity and environmental adaptability, this low-temperature sensor can be widely applied in fields such as medical cryopreservation, polar environment monitoring, cold chain temperature control and industrial low-temperature process regulation.</p> Graphical Abstract <p>(<b>a</b>) Test flow chart of the silver film-coated D-shaped PCF temperature sensor. (<b>b</b>) Linear fitting curve of temperature versus resonance wavelength for the x-polarized core mode of the sensor under corresponding structural parameters. (<b>c</b>) Linear fitting curve of temperature versus resonance wavelength for the y-polarized core mode of the sensor under corresponding structural parameters</p> <p></p>

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Ultrasensitive Low-Temperature Sensor based on Silver Nano-Film-Coated Dual-Polarization Photonic Crystal Fiber

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Jiyu Dong,
  • Yu Feng,
  • Shuhuan Zhang,
  • Zhiyuan Han,
  • Qichao Wang,
  • Xue Li,
  • Bowen Feng,
  • Shaoxiong Wu,
  • Mengyan Wei

摘要

To address the urgent demand for ultrasensitive low-temperature measurement technology, a novel D-shaped photonic crystal fiber (PCF) low-temperature sensor is proposed in this study. Based on the surface plasmon resonance (SPR) effect, the sensor adopts a silver nanofilm as the excitation layer and polydimethylsiloxane (PDMS) as the temperature-sensitive material for accurate temperature measurement. The finite element method (FEM) is adopted to simulate and optimize key parameters, including silver nanofilm thickness, polishing depth, and semi-axial dimensions of the elliptical air holes. Simulation results show that at -35℃ to 0℃, the average wavelength sensitivity of the x-polarized mode is 15.36 ~ 17.54 nm/℃ within the 1200 ~ 2500 nm band, and the value reaches 16.50 ~ 18.49 nm/℃ for the y-polarized mode in the 1200 ~ 2700 nm band. Featuring both high sensitivity and environmental adaptability, this low-temperature sensor can be widely applied in fields such as medical cryopreservation, polar environment monitoring, cold chain temperature control and industrial low-temperature process regulation.

Graphical Abstract

(a) Test flow chart of the silver film-coated D-shaped PCF temperature sensor. (b) Linear fitting curve of temperature versus resonance wavelength for the x-polarized core mode of the sensor under corresponding structural parameters. (c) Linear fitting curve of temperature versus resonance wavelength for the y-polarized core mode of the sensor under corresponding structural parameters