Single mode optical fiber sensor based on surface plasmon resonance for the detection of the Lactic acid for the chemical sensor

In this work, using single mode fiber (SMF), an optical fiber chemical sensor based on Surface Plasmon Resonance (SPR) has been designed and put into action for use. The sensor’s performance parameters, including, signal to noise ratio, figure of merit, resolution, and sensitivity, are evaluated together with the refractive indices and concentrations of several types of lactic acid. The optical fiber-based SPR sensor’s value sensitivity was discovered. The sensor’s exposed sensing region was a 4 cm long and 40 nm thick Au metal layer, was 6 μm/RIU, while the figure of merit was 22.87, the resolution was 1.6x10^− 4, and the SNR was 0.18.