Abstract

A novel analysis based on surface plasmon resonance (SPR) with a side-polished multimode fiber and a white-light (halogen light) source is presented. The sensing system is a multimode optical fiber in which half of the core has been polished away and a 40nm gold layer is deposited on to the polished surface by dc sputter. The SPR dip in the optical spectrum is investigated with an optical spectrum analyzer (OSA). In our SPR fiber sensor, the use of liquids with different refractive indices leads to a shift in the spectral dip in the SPR curve. The cross point (CP) of the two SPR spectra obtained from the refractive-index liquid and the deionized water measurements was observed with the OSA. The CP is shifted sensitively in wavelength from 630to1300nm relative to a change in the refractive index of the liquid from 1.34 to 1.46. High sensitivities of 1.9×106 refractive-index units (RIUs) in the range of the refractive index of the liquid from 1.40 to 1.44 of 5.7×107 RIUs above the value of 1.44 are proposed and demonstrated in our novel SPR analysis.

© 2005 Optical Society of America

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