The reflectivity of three layer and four layer optical fiber based surface plasmon resonance sensors having silica material substrate and chalcogenide material substrate is plotted and studied. Using the transfer matrix method, the reflection coefficient for p-polarized incident lights at various wavelengths is obtained. It is observed that the sensitivity, detection accuracy and quality parameters of the sensor having silica substrates are much larger than the chalcogenide substrates. These parameters can also be increased by introducing an additional thin layer of silica/chalcogenide material on the metallic surface. Also, these sensor parameters are highly affected by the thickness of the additional thin layer.
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