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<p>In this paper, a dual-side polished photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor for refractive index (<i>RI</i>) and temperature (<i>T</i>) sensing is presented and studied theoretically using finite element method (FEM). Metal alloy film coating for core 1 (C<sub>1</sub>) and a composite of silver and polydimethylsiloxane (PDMS) is used for core 2 (C<sub>2</sub>) for <i>RI</i> and temperature sensing, respectively. Detection ranges of 1.33 to 1.42 <i>RI</i> and − 20 to 100&#xa0;°C were realized for <i>RI</i> and <i>T</i> measurements, respectively. The alloy coating generates two distinct resonance peaks. A maximum wavelength sensitivity of 54,300&#xa0;nm/<i>RIU</i> and a resolution of 1.84 × 10⁻⁶ <i>RIU</i> were achieved at the second peak of core 1 (C<sub>1</sub>) for analytes with <i>RI</i> values of 1.41 and 1.42. The Ag/PDMS composite coating yields a wavelength sensitivity of 39.6&#xa0;nm/°C and a resolution of 2.52 × 10⁻<sup>3</sup>&#xa0;°C in the temperature range of − 20 to − 10&#xa0;°C. Eleven air holes in the cladding with two cores are simple to fabricate, cost effective, and show improved sensitivities with two peaks of core 1 using alloy coating is the key innovation in this work. Wide detection range, high sensitivities, and dual-parameter sensing make this work suitable for various applications including bio-sensing, environmental detection, and chemical sensing.</p>

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Ag-Au Alloy Film and Ag/PDMS Film–Coated Dual-side Polished Photonic Crystal Fiber for Refractive Index and Temperature Detection

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Sajid Ullah,
  • Hailiang Chen,
  • Sa Zhang,
  • Linchuan Hu,
  • Junling Hu,
  • Shuguang Li

摘要

In this paper, a dual-side polished photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor for refractive index (RI) and temperature (T) sensing is presented and studied theoretically using finite element method (FEM). Metal alloy film coating for core 1 (C1) and a composite of silver and polydimethylsiloxane (PDMS) is used for core 2 (C2) for RI and temperature sensing, respectively. Detection ranges of 1.33 to 1.42 RI and − 20 to 100 °C were realized for RI and T measurements, respectively. The alloy coating generates two distinct resonance peaks. A maximum wavelength sensitivity of 54,300 nm/RIU and a resolution of 1.84 × 10⁻⁶ RIU were achieved at the second peak of core 1 (C1) for analytes with RI values of 1.41 and 1.42. The Ag/PDMS composite coating yields a wavelength sensitivity of 39.6 nm/°C and a resolution of 2.52 × 10⁻3 °C in the temperature range of − 20 to − 10 °C. Eleven air holes in the cladding with two cores are simple to fabricate, cost effective, and show improved sensitivities with two peaks of core 1 using alloy coating is the key innovation in this work. Wide detection range, high sensitivities, and dual-parameter sensing make this work suitable for various applications including bio-sensing, environmental detection, and chemical sensing.