Publications

Publications by Diana Viegas

2009

<title>Fibre Bragg gratings as interrogation elements for surface plasmon resonance sensors</title>

Authors
Díaz-Herrera, N; Viegas, D; Jorge, PAS; Navarrete, MC; Ferreira, LA; Araújo, FM; Santos, JL; González-Cano, A;

Publication
20th International Conference on Optical Fibre Sensors

Abstract

2011

<title>Miniature fiber Bragg grating strain rosette based on lossless tapers</title>

Authors
Viegas, D; Navarrete, MC; Díaz-Herrera, N; González-Cano, A; Santos, JL; Araújo, FM;

Publication
21st International Conference on Optical Fiber Sensors

Abstract

2010

<title>Fibre optic remote sensing based on long period gratings with in situ optical source</title>

Authors
Viegas, D; Carvalho, JP; Coelho, L; Santos, JL; Ferreira, LA; Araújo, FM; Frazão, O;

Publication
Fourth European Workshop on Optical Fibre Sensors

Abstract

2010

<title>Moving the wavelength detection range in surface plasmon resonance sensors based on tapered optical fibers</title>

Authors
Díaz-Herrera, N; González-Cano, A; Viegas, D; Santos, JL; Navarrete, M; Esteban,;

Publication
Fourth European Workshop on Optical Fibre Sensors

Abstract

2012

Simultaneous measurement of partial pressure of O-2 and CO2 with a hybrid interferometer

Authors
Coelho, L; Tafulo, PAR; Jorge, PAS; Santos, JL; Viegas, D; Schuster, K; Kobelke, J; Frazao, O;

Publication
OPTICS LETTERS

Abstract
In this Letter, a hybrid interferometer for simultaneous measurement of the partial pressures of O-2 and CO2 mixtures is reported. The sensing head consists in the combination of two interferometric structures, one a Fabry-Perrot cavity and the other a modal interferometer. The intrinsic Fabry-Perot was formed by splicing a single mode fiber with a graded index fiber length that was then subjected to chemical etching creating an air cavity. The second interferometer is based on a splice of a pure silica tube in series with the Fabry-Perot. It was observed for a particular gas that its refractive index changes with pressure variation in a specific way, a characteristic that permitted the simultaneous measurement of partial pressures of CO2 and O-2 with rms deviations of similar to +/- 48.7 kPa and similar to +/- 20.1 kPa, respectively. (C) 2012 Optical Society of America

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2010

Surface-Plasmon-Resonance Sensor Based on H-shaped Optical Fibre

Authors
Viegas, D; Hautakorpi, M; Guerreiro, A; Santos, JL; Ludvigsen, H;

Publication
FOURTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS

Abstract
We propose and theoretically study a novel surface-plasmon-resonance sensor based on an H-shaped, elliptical-core optical fibre. The two grooves of the H-fibre are coated with a thin, uniform metal layer that in turn is covered with a high-index dielectric layer to allow broad spectral tunability. The sensor maintains linear polarization and facilitates effortless splicing. Electromagnetic mode analysis indicates a sensitivity of 1800 nm/RIU (refractive-index unit) for aqueous analytes.

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