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<p>Photonic crystal fiber sensors based on surface plasmon resonance are one of the excellent solutions for high-performance sensing. Its design flexibility is impressive, offering numerous advantages compared to conventional fibers, such as improved birefringence, endless single-mode operation, and a larger mode area, among others. This research presents a novel design that includes a dual U-shaped, highly sensitive SPR-PCF refractive index sensor. This work uses a finite element method model to investigate how the core mode relates to the surface plasmon polaritons mode. The proposed sensor shows impressive performance, achieving a wavelength sensitivity of 27,000&#xa0;nm/RIU, an amplitude sensitivity of 3,655 RIU<sup>− 1</sup>, and a resolution of 3.7 × 10<sup>− 6</sup> RIU. Furthermore, analyzing the tolerance of key design parameters—mainly the air-hole radii and the thickness of the plasmonic layer—demonstrates the sensor’s resilience to variations in fabrication. The obtained results indicated that the proposed sensing approach is suitable for chemical/biological sensing.</p>

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Numerical investigation of ultra-high-sensitivity double U-shaped SPR-PCF for MIR refractive index sensing applications

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Prashant Kumar,
  • Rakesh Ranjan

摘要

Photonic crystal fiber sensors based on surface plasmon resonance are one of the excellent solutions for high-performance sensing. Its design flexibility is impressive, offering numerous advantages compared to conventional fibers, such as improved birefringence, endless single-mode operation, and a larger mode area, among others. This research presents a novel design that includes a dual U-shaped, highly sensitive SPR-PCF refractive index sensor. This work uses a finite element method model to investigate how the core mode relates to the surface plasmon polaritons mode. The proposed sensor shows impressive performance, achieving a wavelength sensitivity of 27,000 nm/RIU, an amplitude sensitivity of 3,655 RIU− 1, and a resolution of 3.7 × 10− 6 RIU. Furthermore, analyzing the tolerance of key design parameters—mainly the air-hole radii and the thickness of the plasmonic layer—demonstrates the sensor’s resilience to variations in fabrication. The obtained results indicated that the proposed sensing approach is suitable for chemical/biological sensing.