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Significant retrieval of lost evanescent power by tuning modes close-to-cutoff with a gel-coated taper.

We report a fiber-optic evanescent-wave (EW) sensor capable of dramatically increasing the power collection level by capturing the EW power that is normally lost. The key element is a taper with a thin overlay that is completely separated from the sample by an arbitrary distance and thus operates remotely within the instrumentation system. A two-stage tuning of the close-to-cutoff modes occurring within this element is proposed to interpret the observed phenomenon.