Abstract
In this research, a fiber optic sensor based on surface plasmon resonance (SPR) was prepared. The sensor of SPR was configured using a gold thin layer at 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. The SPR sensor was immersed into media with different refractive indices in the range of 1 to 1.58, including their similar plasmon resonance wavelength shifts that were saved by the optical spectrum analyzer. Experimental results that were obtained show there is a redshift when increasing the refractive index of solutions and sensitivity reach 298nm/ RIU, and resolution 4.31x?10?^(-4).
Highlights
Surface plasmon resonance (SPR) is a physical phenomenon that occurs when electrons oscillation at the interface between a thin metallic film and a dielectric medium [1]
The ability concerning the SPR fiber optic sensor to discover the variation of the surrounding refractive index (RI) within the noticeable spectrum is first tested
A simple optical fiber sensor based on SPR was prepared and employed for testing refractive index changes of several solvents
Summary
Surface plasmon resonance (SPR) is a physical phenomenon that occurs when electrons oscillation at the interface between a thin metallic film (gold or silver) and a dielectric medium (glass, liquid, gas) [1]. The SPR sensor is measured using the Kretschman structure as shown in Figure including the prism and a thin metal coating (e.g. silver or gold) covered on bottom of prism for reflecting. Both silver and gold are utilized to excite SPR in the visible and near infrared range [3].
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