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We investigate here Localized Surface Plasmon Resonance (LSPR)-based fiber optic sensors grounded uncladded multi-mode silica fibers with gold nanostars (NSs) and spherical nanoparticles (NPs) deposition. By tuning NS morphology, we achieve precise LSPR control, reaching 560 nm/RIU sensitivity at 810 nm, significantly outperforming NPs. As benchmark molecule, the sensor detects Thiram pesticide across 10 pM-100 μM range with a 0.3 pM detection limit, demonstrating exceptional analytical performance. The branched NS architecture leverages enhanced local field effects for superior sensitivity compared to conventional NPs, while the fiber-optic design ensures robustness and field deployability. Overall, this platform combines simplicity, cost-effectiveness, and tunable sensitivity, making it ideal for circumstantial monitoring, biomedical diagnostics, and chemical sensing.

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Fiber Optic Sensors Based on Localized Surface Plasmon Resonance (LSPR) of Gold Nanostars

  • 会议论文

  • 发表日期：

    2026年

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  • Amin Moslemi,
  • Lucia Sansone,
  • Flavio Esposito,
  • Carlos Marques,
  • Stefania Campopiano,
  • Michele Giordano,
  • Agostino Iadicicco

摘要

We investigate here Localized Surface Plasmon Resonance (LSPR)-based fiber optic sensors grounded uncladded multi-mode silica fibers with gold nanostars (NSs) and spherical nanoparticles (NPs) deposition. By tuning NS morphology, we achieve precise LSPR control, reaching 560 nm/RIU sensitivity at 810 nm, significantly outperforming NPs. As benchmark molecule, the sensor detects Thiram pesticide across 10 pM-100 μM range with a 0.3 pM detection limit, demonstrating exceptional analytical performance. The branched NS architecture leverages enhanced local field effects for superior sensitivity compared to conventional NPs, while the fiber-optic design ensures robustness and field deployability. Overall, this platform combines simplicity, cost-effectiveness, and tunable sensitivity, making it ideal for circumstantial monitoring, biomedical diagnostics, and chemical sensing.