Laser-induced photodeposition of silver nanoparticles on the optical fiber vertex for refractive index measurement relied on localized surface plasmon resonance

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The local surface plasmon resonance optical fiber sensor is presented for refractive index detection using different deposition time of silver nanoparticles. Photodeposition technique was used to adhere silver nanoparticles (Ag NPs) on the end of optical fiber. Laser diode was coupled with optical fiber and Ag NPs were suspended in an ethanol. The sensing region from optical fiber immersed at a different media such as (air, water, benzene, hexane, aniline) which leads to different refractive indices (1-1.568). Different deposition time leads to produce different Ag NPs concentration (5.21% and 37.7%) and the values of sensitivity (150.41,130.54 nm/RTU)