Safira Adara Khairunnisa, Meta Yantidewi, Rohim Aminullah Firdaus, Nafisah Nur Laila, Muhimmatul Khoiro
A reagent-free method for detecting Bisphenol-A in water was developed using a plastic optical fibre (POF) sensor with a low-cost optoelectronic system. Unclad POF segments of varying lengths (0.5, 1.0, 1.5, 2.0 cm) were chemically and mechanically etched to enable evanescent field interaction with BPA. A 650 nm laser served as the light source, while a photodiode-LCD circuit displayed signal transmission. FEM simulations were conducted to visualize evanescent field interactions at the core–analyte boundary, providing new insights into light propagation in the sensor. Experiment with five BPA concentrations (0.05, 0.50, 1.00, 1.50, 2.00 ppm) showed optimal performance at 1.0 cm, with sensitivity of 1.06dB, detection limit of 1.20 × 10−7 g/mL, and linearity of R²=96%. Though non-specific to BPA, the system offers key advantages in cost, portability, and speed, making it suitable for environmental monitoring in low-resource settings. © 2025 Informa UK Limited, trading as Taylor & Francis Group.
Department of Physics, Universitas Negeri Surabaya, Surabaya, Indonesia
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