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Invited Talks: Prof. Francisco J. Arregui

Prof. Francisco J. Arregui

Universidad Pública de Navarra, Dpto. IEE, 31006 Pamplona, Spain

[Francisco J. Arregui]

Francisco J. Arregui is an Associate Professor at the Public University of Navarra, Pamplona, Spain. He was part of the team that fabricated the first optical fiber sensor by means of the layer-by-layer electrostatic self-assembly method in 1998 at Virginia Tech, Blacksburg, VA, USA. He is the author of around 200 scientific journal and conference publications, most of them related to optical fiber sensors based on nanostructured coatings. Francisco J. Arregui cooperates regularly with the scientific committees of several international conferences; he is an Associate Editor of the IEEE Sensors Journal and is currently editing a book about “Sensors based on nanostructured materials”.

 

Optical fiber sensors based on nanostructured coatings fabricated by means of the Layer-by-Layer Electrostatic Self-Assembly method

Francisco J. Arregui

Universidad Pública de Navarra, Dpto. IEE, 31006 Pamplona, Spain

The Layer-by-Layer Electrostatic Self-Assembly (ESA) method has been successfully used for the design and fabrication of nanostructured materials. More specifically, this technique has been applied for the deposition of thin films on optical fibers with the purpose of fabricating different types of optical fiber sensors. In fact, optical fiber sensors for measuring humidity, temperature, pH, hydrogen peroxide, glucose, volatile organic compounds or even gluten have been already experimentally demonstrated. The versatility of this technique allows the deposition of these sensing coatings on flat substrates and complex geometries as well. For instance, nanoFabry-Perots and microgratings have been formed on cleaved ends of optical fibers (flat surfaces) and also sensing coatings have been built onto long period gratings (cylindrical shape), tapered fiber ends (conical shape), biconically tapered fibers or even the internal side of hollow core fibers. Among the different materials used for the construction of these sensing nanostructured coatings, diverse types such as polymers, inorganic semiconductors, colorimetric indicators, fluorescent dyes, quantum dots or even biological elements as enzymes can be found. As a generic rule these devices enjoy a very fast response time and one of the challenges is to improve their selectivity and sensitivity. Thanks to the control on the nanometer scale of the thickness and composition of the nanostructured ESA coatings it has been possible to observe phenomena never seen before experimentally; this technique opens the door to the fabrication of new types of optical fiber sensors.

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