The core and cladding modes exhibit different refractive index sensitivities, while temperature and stress
sensitivities are approximately equal. Because of the characters of cladding mode, the solution refractive index(SRI)
sensor is designed and studied. In order to increase the sensitivity of SRI sensor, 45nm thick gold film is deposited on the
surface of cladding of TFBG to excite surface plasmon resonance(SPR). The quality and uniformity of gold surface were
investigated with aid of a thermal field scanning electron microscopy and the effect is satisfactory. After that, the
refractive index(RI) sensing characteristics of both bare and gold deposited TFBGs were studied by experiments of
different concentration solutions of NaCl、MgCl2 and CaCl2 respectively. The result proved that the TFBG-SPR increase
the RI sensitivity dramatically by 1.5 nm/RIU to 500 nm/RIU. And SRI of TFBG-SPR is 250 to 400 times larger than
that of the bare-TFBG. The linear fittings of the center wavelength of cladding modes and SRI of bare and gold-coating
deposited SPR sensor are good when refractive index is changed from 1.333 to 1.3941. Meanwhile, the influence of
temperature on SPR was taken in consideration and compensated.
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