Original research articleSPR based fiber optic sensor with bi layers of indium tin oxide and platinum: A theoretical evaluation

- SPR based fiber optic sensor with bi layers of ITO-Pt is analyzed.
- Performance increases with increase in Pt layer thickness.
- Performance decreases with increase in ITO layer thickness.
- Optimized thicknesses of ITO and Pt layers are 50 nm and 25 nm respectively.

Theoretical analysis of surface plasmon resonance (SPR) based fiber optic sensor with bi layers of ITO-Pt is carried out. Sensitivity and figure of merit (FOM) of sensor increase with increase in Pt layer thickness for all thicknesses of ITO layers. Though, for a fixed thickness of Pt layer, sensitivity and FOM are reduced with increase in ITO layer thickness. 50 nm ITO-25 nm Pt based SPR sensor reveals maximum sensitivity and FOM.