Fabrication of multi-mode tip fiber sensor based on surface plasmon resonance (SPR)

During this work, fiber optic sensor based on surface Plasmon resonance (SPR) was prepared. The sensor of SPR was configured by coating a thin layer of gold film on the end of a cleaved optical fiber by a sputtering technique. The source of white light was utilized to produce a series of wavelengths and excites surface Plasmon resonance at the fiber tip. SPR sensor was immersed into media with different refractive indexes in the range )1-1.58( including their similar Plasmon resonance wavelength shifts were saved by optical spectrum analyzer and noticed reflected light on a personal computer. Experimental results that obtained show there is a redshift when increasing the refractive index of solutions and sensitivity reach 298nm/ RIU, and resolution 4.31x .