Surface Plasmon Resonance-Based Fiber Optic Sensors: Principle, Probe Designs, and Some Applications

Figure 7

Variation of sensitivity with sensing layer refractive index. A: Silica doped with GeO₂ (19.3); B: Silica doped with GeO₂ (6.3); C: Silica doped with P₂O₅ (10.5); D: Pure silica with no doping; and E: Silica doped with B₂O₃ (5.2). Numbers in brackets are the molar concentrations of dopant in mole % [27]. © Elsevier.