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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

Coelho, L (Autor) FCUP; Viegas, D (Autor) FCUP; Santos, JL (Autor) FCUP; de Almeida, JMMM (Autor) FCUP

Revista

Título: Sensors and Actuators, B: Chemical

Vol. 223

Páginas: 45-51

ISSN: 0925-4005

Editora: Elsevier

Indexação

ISI Web of Knowledge - 65 Citações

Scopus - 66 Citações

Outras Informações

ID Authenticus: P-00G-P4B

DOI: 10.1016/j.snb.2015.09.061

Abstract (EN): 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 similar to 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 similar to 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7