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<p>In this work, we present a novel approach for incorporating D-shaped polarization-maintaining photonic crystal fiber (PM-PCF) surface-enhanced Raman scattering (SERS) sensors with a Raman spectrometer to achieve high sensitivity for detecting trace levels of an aromatic amine (aniline). The PM-PCF SERS probe was fabricated by applying a gold nano-layer of 40 nm thickness to the surface of the D-shaped fiber end. The SERS signals induced by organic pollutants are measured, and the sensing performance of the proposed sensors is examined through experimental analysis. The optimized structure exhibited a four-fold enhancement in SERS signals compared to a conventional reflection configuration. Different concentrations of aniline were detected, with a limit of detection (LOD) of 1.53 nM and a sensitivity of 1570.2 (a.u.)/nM for the dominant peak. This D-shaped PM-PCF sensor, coated gold and highly sensitive, is expected to be useful for online analysis and environmental monitoring.</p>

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Fiber-optic SERS sensor for ultra-sensitive detection of aniline at trace concentrations

  • 期刊论文

  • 发表日期：

    2025年6月7日

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  • Suaad Sahib Hindal,
  • Zainab F. Al-Bawai,
  • Aseel I. Mahmood

摘要

In this work, we present a novel approach for incorporating D-shaped polarization-maintaining photonic crystal fiber (PM-PCF) surface-enhanced Raman scattering (SERS) sensors with a Raman spectrometer to achieve high sensitivity for detecting trace levels of an aromatic amine (aniline). The PM-PCF SERS probe was fabricated by applying a gold nano-layer of 40 nm thickness to the surface of the D-shaped fiber end. The SERS signals induced by organic pollutants are measured, and the sensing performance of the proposed sensors is examined through experimental analysis. The optimized structure exhibited a four-fold enhancement in SERS signals compared to a conventional reflection configuration. Different concentrations of aniline were detected, with a limit of detection (LOD) of 1.53 nM and a sensitivity of 1570.2 (a.u.)/nM for the dominant peak. This D-shaped PM-PCF sensor, coated gold and highly sensitive, is expected to be useful for online analysis and environmental monitoring.