The refractive index (RI) sensor is utilized in various applications in industry because of its recognizing physical and biological parameters. The fiber optic RI sensor is perfect for RI measurement of fluids in industrial, chemical and food processing industry applications. Nanoparticles (Nps) of noble metals have turned out to be exceptionally fascinating materials as result pf their distinct properties. The fabrication of metallic nanoparticles (NPs), mostly gold and silver, has attracted much interest due to their surface plasmon effect related properties those are potentially useful for...