A comparative study between SMS interferometers and lossy mode resonace optical fiber devices for sensing applications
Fecha
2015Autor
Versión
Acceso abierto / Sarbide irekia
Tipo
Contribución a congreso / Biltzarrerako ekarpena
Versión
Versión aceptada / Onetsi den bertsioa
Impacto
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10.1117/12.2179684
Resumen
Optical fiber sensors are of great interest due to their intrinsic advantages over electronic sensors. In this work, the
sensing characteristics of two different and novel optical fiber devices are compared, after simultaneously depositing a
thin-film using the layer-by-layer assembly deposition process. The first one is an SMS structure, formed by splicing two
single-mode fiber pigtails on bo ...
[++]
Optical fiber sensors are of great interest due to their intrinsic advantages over electronic sensors. In this work, the
sensing characteristics of two different and novel optical fiber devices are compared, after simultaneously depositing a
thin-film using the layer-by-layer assembly deposition process. The first one is an SMS structure, formed by splicing two
single-mode fiber pigtails on both sides of a coreless multimode fiber segment. This structure induces an interferometric
phenomenon that generates several attenuation and transmission bands along the spectrum. These bands are sensitive to
variations in the surrounding refractive index, although this sensitivity has been enhanced by a TiO2/PSS thin-film. The
other device is a 40 mm uncladded segment of a 200 µm-core multimode optical fiber. When coated by a TiO2/PSS thinfilm, part of the light transmitted into the uncladded core is coupled into the thin-film, generating a lossy mode resonance
(LMR). The absorption peaks due to these phenomena red-shift as long as the thin-film thickness increases or the
external RI becomes higher. The performance of these devices as refractometers and relative humidity sensors are tested.
Results show that the LMR-based sensor is more sensitive in both situations, in spite of its lower sensitivity. Particularly,
it presents a 7-fold sensitivity enhancement when measuring surrounding medium refractive index changes and a 10-fold
sensitivity enhancement when measuring environmental relative humidity. To our knowledge, this is the first time that a
comparative study between SMS and LMR sensors is performed. [--]
Materias
Optical fiber sensors,
Lossy mode resonances,
SMS structure,
Interferometry,
Thin-films,
Layer-by-layer assembly,
Refractometer,
Humidity sensor
Editor
SPIE
Publicado en
En: Sánchez-Rojas, J. L; Brama, R. (Eds.). Smart Sensors, Actuators, and MEMS VII Cyber Physical Systems. SPIE: 2015. 978-162841639-8
Departamento
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa eta Elektronikoa Saila
Versión del editor
Entidades Financiadoras
This work was supported by the Spanish Economy and Competitiveness Ministry project FEDER TEC2013-43679-R and by a Public University of Navarra pre-doctoral research grant.