Abstract

We propose and experimentally demonstrate an enhanced evanescent field fiber refractometer based on a tapered multimode fiber sandwiched between two single-mode fibers. Experiments show that this fiber sensor offers ultrahigh sensitivity [better than 1900nm/RIU at a refractive index (RI) of 1.44] for RI measurements within the range of 1.331.44, in agreement with the theoretical predictions. This is the highest value reported to date (to our knowledge) in the literature.

© 2011 Optical Society of America

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