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Sensors 2009, 9(1), 519-527; doi:10.3390/s90100519
Article

Sensitivity Improvement of a Humidity Sensor Based on Silica Nanospheres on a Long-Period Fiber Grating

1,2,* , 3
,
1,2
,
2
,
2
,
3
 and
3
1 -Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal 2 INESC Porto, Rua Dr. Roberto Frias, 378, 4200-465 Porto, Portugal 3 Universidad Pública de Navarra, Campus Arrosadia, 31006 Pamplona, Spain
* Author to whom correspondence should be addressed.
Received: 29 October 2008 / Revised: 19 December 2008 / Accepted: 15 January 2009 / Published: 16 January 2009
(This article belongs to the Special Issue Nanotechnological Advances in Biosensors)
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Abstract

This work addresses a new configuration that improves the sensitivity of a humidity sensor based on a long-period fiber grating coated with a SiO2-nanospheres film. An intermediate higher refractive index overlay, deposited through Electrostatic Self-Assembly, is placed between the fiber cladding and the humidity sensitive film in order to increase the total effective refractive index of the coating. With this intermediate design, a three-fold improvement in the sensitivity was obtained. Wavelength shifts up to 15 nm against 5 nm were achieved in a humidity range from 20% to 80%.
Keywords: Humidity sensor; long-period fiber grating; nanospheres; electrostatic self-assembly Humidity sensor; long-period fiber grating; nanospheres; electrostatic self-assembly
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Viegas, D.; Goicoechea, J.; Santos, J.L.; Araújo, F.M.; Ferreira, L.A.; Arregui, F.J.; Matias, I.R. Sensitivity Improvement of a Humidity Sensor Based on Silica Nanospheres on a Long-Period Fiber Grating. Sensors 2009, 9, 519-527.

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