In this paper, we propose a Refractive index Fiber-Optic SPR sensor with a D-shaped structure. Due to numerous advantages such as miniaturized size, fast response, and immunity to electromagnetic interference, optical fiber has been comprehensively used for different sensing applications. It consists of a multi-mode sensor with a bi-metallic thin film structure with Ag and AlSb as the sensing layer. The refractive index (RI) of the testing solution gets incremented from 1.37 till 1.40. The refractive index sensitivity gets varied non-linearly from 15,400 to 30,800 nm/RIU in the NIR region. Fabrication of the sensor is easier and thereby it is suitable for any sensing environment.
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