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A fibre optic long period grating (LPG) with an nano-assembled mesoporouscoating of alternate layers of poly (allylamine hydrochloride) (PAH) and SiO2nanospheres was used for the development of a fibre-optic refractometer. PAH/SiO2 films of different thickness have been deposited onto an LPG in order tostudy the effect of the film thickness on sensor performance. The device showeda sensitivity of 1927 nm/RIU over a RI range of 1.3233-1.4906

Refractive index sensitivity of fibre optic long period gratings with SiO 2 nanoparticle based mesoporous coatings