Abstract

A highly sensitive surface plasmon resonance based fiber optic sensor with platinum (Pt) layer coated on the core of the optical fiber is presented and theoretically analyzed. The sensitivity of the proposed sensor enhances linearly with the increase in the refractive index of the sensing medium for all thicknesses of Pt layers and for a given refractive index of the sensing medium, it increases with the increase in the thickness of Pt layer. 125nm thick Pt layer based fiber optic SPR sensor exhibits greatest sensitivity at high values of refractive index of the sensing medium.

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