Enhancing sensitivity of photonic crystal fiber interferometric humidity sensor by the thickness of SnO2 thin films
In order to improve the sensitivity of an interferometric humidity sensor based on a photonic crystal fiber with a sputtered SnO2 nanocoating, a study of the effect of its thickness on the sensitivity is presented in this paper. Sensors with coatings of different thickness were performed by applying...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Universidad Pública de Navarra |
| Repositorio: | Academica-e. Repositorio Institucional de la Universidad Pública de Navarra |
| OAI Identifier: | oai:academica-e.unavarra.es:2454/47048 |
| Acceso en línea: | https://hdl.handle.net/2454/47048 |
| Access Level: | acceso abierto |
| Palabra clave: | Photonic crystal fiber Interferometer Sputtering Thickness Humidity sensor Evanescent field |
| Sumario: | In order to improve the sensitivity of an interferometric humidity sensor based on a photonic crystal fiber with a sputtered SnO2 nanocoating, a study of the effect of its thickness on the sensitivity is presented in this paper. Sensors with coatings of different thickness were performed by applying distinct sputtering times in order to obtain an optimal thickness: the resulting nanofilms ranged from 470 to 1800 nm. Sensors were tested increasing the relative humidity from 20% to 90%, finding that the thickness was a key parameter which has to be optimized at nanometer scale to get the best sensitivity. The study points that there is an optimal thickness and higher or lower thicknesses worsen the sensitivity of the sensor. The optimal sensor showed a humidity resolution of 0.067%HR, a wavelength shift of 67 nm and a negligible sensitivity with the temperature. |
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