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Title: Characterization of zinc oxide coated optical fiber long period gratingswith improved refractive index sensing properties
Authors: Coelho, Luís
Viegas, Diana
Santos, José Luís
Almeida, José Manuel Marques Martins de
Keywords: Long period fiber gratings
Fiber sensors
Zinc oxide coated LPFG
Refractive index
Fiber optic refractometer
Issue Date: 1-Mar-2016
Abstract: A 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.
Peer Reviewed: yes
Document Type: Article
Appears in Collections:DFIS - Artigo publicado em Revista Científica Indexada

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