Abstract Present study discusses the experimental demonstration of optical fiber surface plasmon resonance (SPR) sensor for the determination of fluoride contamination in drinking water. Kretschmann–Raether configuration is employed on an optical fiber with sodium fluoride (NaF) contaminated distilled (DI) water that acts as a sensing analyte. A nanofilm of silver (Ag) about 50?nm in thickness is deposited over cladding etched portion of the optical fiber core. NaF salt concentration is varied from 0.005 to 0.035?g/mL in DI water and refractive index (RI) measurements of each concentration show linear increment with increase in NaF concentration. Present study is based on the principle that with a tiny variation in RI of sensing analyte, a change in resonance wavelength is detected as per SPR condition. For the designed fiber optic probe, sensitivity is calculated with variable RI and comes out to be 6489.03?nm/RIU (Refractive index unit). Results demonstrate that the developed SPR-based fiber optic sensor can be valuable for the detection of fluoride impurities in drinking water.
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