Sensor Ãptico em fibra multimodo baseado em ressonÃncia de plÃsmons de superfÃcie / Multimode optical fiber sensor based on surface plasmon resonance

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

This work is directed to the theoretical and experimental study of the surface plasmon resonance (SPR) effect in multimode optical fibers and its application in the development of fiber sensors. A review of the theoretical framework related to surface plasmon oscillations (SPO) is first presented, that includes the analysis of conditions for their existence as well as classical configurations used for observation of these oscillations. Configurations described in the literature for observation of the SPR effect in optical fibers are also presented and a theoretical model for the light irradiated by a, partially metallized, multimode optical fiber is reviewed. In the experimental portion of the work, an illumination and optical detection system coupled to a data acquisition system was set up for precise measurement of the light irradiated by an optical fiber. A Windows compatible, software code with graphical interface was developed for automatic processing of irradiated image patterns that allowed determination of optical fiber parameters. With this system it was possible to make the first experimental observation of the SPR effect within the light distribution irradiated by a, partially metallized, optical fiber. The usefulness of the effect for the development of optical fiber sensors was tested by determining salt concentration in aqueous solutions. Results of these experiments showed that the proposed detection strategy can reach up to an order of magnitude sensitivity enhancement relative to that achieved by use of conventional detection schemes of the SPR effect in multimode fibers

ASSUNTO(S)

plÃsmons de superfÃcie engenharia eletrica surface plasmons sensores Ãpticos rps optical sensors fibras multimodo spr

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