Twist sensor based on surface plasmon resonance excitation using two spectral combs in one tilted fiber Bragg grating

An optical fiber twist sensor based on surface plasmon resonance (SPR) excitation and able to operate in both gaseous and liquid media is proposed and demonstrated. The use of a gold-coated 37.5 degrees tilted fiber Bragg grating allows one to generate two windows of cladding mode resonances, providing surrounding refractive index sensitivity in two different external media. The relative optical power of the SPR mode in each case exhibits a linear response to the twist angle of the fiber from 0 degrees to 90 degrees, as well as from 90 degrees to 180 degrees, as a consequence of the polarization dependency of these sensors. The results show sensitivities of 1.15%/degrees and 1.22%/degrees with the sensor working in air and liquids, respectively, being suitable for deformation measurement and structural health monitoring applications. (C) 2019 Optical Society of America