Characterization of zinc oxide coated optical fiber long period gratingswith improved refractive index sensing properties

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dc.contributor.authorCoelho, Luíspt_PT
dc.contributor.authorViegas, Dianapt_PT
dc.contributor.authorSantos, José Luíspt_PT
dc.contributor.authorAlmeida, José Manuel Marques Martins dept_PT
dc.date.accessioned2019-01-17T15:34:45Z
dc.date.available2019-01-17T15:34:45Z
dc.date.issued2016-03-01
dc.description.abstractA fiber-optic refractive index (RI) sensor based on a long period fiber grating (LPFG) coated with a zinc oxide (ZnO) thin film was fabricated and characterized. A method to overcoat the LPFG’s with a homogeneous ZnO thin films was developed. Characterization of ZnO thin films, deposited simultaneously on silicon (Si) planar substrates, was performed using Scanning Electron Microscope, Energy Dispersive X-ray Spectroscopy and X-ray Photoelectron Spectroscopy. The LPFGs with ZnO coatings from 29 to 145 nm of thickness were characterized and compared in terms of the wavelength shift and the intensity of the attenuation bands changing the surrounding refractive index (SRI) from 1.300 to 1.600. An average wavelength sensitivity of ∼7162 nm/RIU was achieved in the RI range from 1.440 to 1.456 and more than 12,000 nm/RIU at 1.440 RI. Using a ZnO film thickness of 116 nm and in the RI region between 1.320 and 1.360 the average sensitivity of ∼806 nm/RIU was measured for a 145 nm thick film. Working as an intensity sensing device, the 87 nm coated LPFG shows a linear sensitivity of 216.4 dB/RIU in a wide range of RI from 1.340 to 1.420.pt_PT
dc.identifier.otherhttps://doi.org/10.1016/j.snb.2015.09.061
dc.identifier.urihttp://hdl.handle.net/10348/9034
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.rightsrestricted accesspt_PT
dc.subjectLong period fiber gratingspt_PT
dc.subjectFiber sensorspt_PT
dc.subjectZinc oxide coated LPFGpt_PT
dc.subjectRefractive indexpt_PT
dc.subjectFiber optic refractometerpt_PT
dc.titleCharacterization of zinc oxide coated optical fiber long period gratingswith improved refractive index sensing propertiespt_PT
dc.typejournal articlept_PT
degois.publication.firstPage45pt_PT
degois.publication.lastPage51pt_PT
degois.publication.titleSensors and Actuators B: Chemicalpt_PT
degois.publication.volume223pt_PT
dspace.entity.typePublicationen
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