Enhanced refractive index sensing characteristics of optical fibre long period grating coated with titanium dioxide thin films

dc.contributor.author Luís Carlos Coelho en
dc.contributor.author Diana Viegas en
dc.contributor.author José Luís Santos en
dc.contributor.author José Almeida en
dc.date.accessioned 2017-11-20T14:28:11Z
dc.date.available 2017-11-20T14:28:11Z
dc.date.issued 2014 en
dc.description.abstract A new type of fibre-optic refractive index sensor based on a long period fibre grating (LPFG) coated with a titanium dioxide (TiO2) thin film was demonstrated. The wavelength shift of the attenuation bands of this LPFG sensor to changes in the refractive index of the external media from 1.30 to 1.64 RIU was investigated. In order to optimize the sensor the TiO2 thin film thickness deposited around the LPFGs was varied from 10 to 80 nm. It was found that the TiO2 thin film increases the wavelength sensitivity of the LPFG to changes in the surrounding refractive index for values lower and higher than the cladding refractive index. As opposed to the bare LPFG it was shown the possibility to monitor refractive indices lower and higher than cladding refractive index tailoring the TiO2 thickness. An average wavelength sensitivity of 5250 nm/RIU was achieved in the range 1.444 to 1.456 RIU for a TiO2 thickness of 50 nm. In the region between 1.46 and 1.48 RIU the average sensitivity of about 825 nm/RIU was measured for a 40 nm thick film. en
dc.identifier.uri http://repositorio.inesctec.pt/handle/123456789/3703
dc.identifier.uri http://dx.doi.org/10.1016/j.snb.2014.06.035 en
dc.language eng en
dc.relation 5799 en
dc.relation 5256 en
dc.relation 347 en
dc.relation 4636 en
dc.rights info:eu-repo/semantics/embargoedAccess en
dc.title Enhanced refractive index sensing characteristics of optical fibre long period grating coated with titanium dioxide thin films en
dc.type article en
dc.type Publication en
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