Abstract

This paper experimentally analyses the axial strain sensitivity of gold-coated tilted fiber Bragg gratings immersed in liquid. For the polarization mode P (polarization parallel to the tilt plane), a strong attenuation of some cladding mode resonances appears in the transmitted spectrum due to the coupling with the Plasmon wave. When axially straining the grating, we report a unique behavior for the cladding mode resonance that presents the strongest attenuation. It presents an axial strain sensitivity (1.33 pm/μe) higher than the Bragg wavelength (1.28 pm/μe) and much higher than neighboring cladding modes (1.16 to 1.22 pm/μe), meaning that differential strain measurements can be achieved with such a sensing platform.

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