A demodulation technique based on orthogonally polarized spectra of gold-coated tilted fiber Bragg gratings is proposed to measure the surrounding refractive index by comparing the differential amplitude of resonance peaks near a Plasmon resonance.

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Conference Optical Sensors, Sensors 2011
Voisin, V., Caucheteur, C., Mégret, P., & Albert, J. (2011). Interrogation of gold-coated TFBG-SPR refractometers based on differential orthogonal light states. Presented at the Optical Sensors, Sensors 2011.