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 at a refractive index (RI) of 1.44] for RI measurements within the range of , 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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