9 December 1999 Gold island fiber optic sensor
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A fiber optic chemical sensor based on gold-island surface plasmon excitation is presented. The sensing part of the fiber is the end of the fiber onto which a thin layer of gold has been deposited to form a particulate surface. Annealing the gold reshapes the particles and produces an optical absorbance near 535 nm with the fiber in air. The optical absorption resonance of the gold particles is shifted if the fiber is immersed in a medium other than air. These resonance shifts are examined by transmission spectroscopy through the fiber. Experimental results for the sensitivity and dynamic range in the measurement of liquid solutions are in agreement with a basic theoretical model which characterizes the surface plasmon using nonretarded electrodynamics.
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Fabrice Meriaudeau, Fabrice Meriaudeau, A. G. Wig, A. G. Wig, A. Passian, A. Passian, Todd R. Downey, Todd R. Downey, Milan Buncick, Milan Buncick, Trinidad L. Ferrell, Trinidad L. Ferrell, } "Gold island fiber optic sensor", Proc. SPIE 3860, Fiber Optic Sensor Technology and Applications, (9 December 1999); doi: 10.1117/12.372960; https://doi.org/10.1117/12.372960

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