<![CDATA[Water pollution from heavy metals, including lead (Pb2+), remains a serious problem for humanity due to their use in various industries. Although the development of water detection sensors has also been widely pursued, including etched fiber Bragg gratings (e-FBG) and tilted FBG (TFBG). FBG is unique because the optical fiber is modified, enabling it to act as a sensitive sensor for detecting Pb2+. However, the existing devices require modifications that entail high costs, the need for skilled operators, and even complex preparation. Therefore, this study reports an FBG-based sensor utilizing AgNPs as a functional material for Pb2+ detection. Notably, the AgNPs were synthesized using laser ablation. In this study, AgNPs were coated onto FBGs to utilize localized surface plasmon resonance (LSPR) for lead detection, achieving a minimum detection limit of 0.65 ppm, a sensitivity of 9.2 × 10-3 dBm/ppm, and high selectivity for Pb2+. Although the detection limit is not below the WHO threshold, these results demonstrate that Ag-coated conventional FBGs have potential for Pb2+ detection n through simple, low-cost, and eco-friendly modifications. Therefore, further modifications are required to enhance the Pb2+ detection performance of the nanoparticle coating on the FBG.]]>
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