Abstract
We demonstrate the characterization of the exponential-decay scattering losses in a tapered optical fiber (TOF) based on near-field-probe-induced scattering. A hemispherical microfiber tip (MFT) with a diameter of 37.3 µm is immersed into the evanescent field of a TOF and induces scattering losses of the TOF. The near-field scattering losses perturbed by the MFT depend on the distance between the MFT and the TOF. The MFT can elongate the penetration depth of the evanescent field significantly when the TOF diameter is small because the effective refractive index outside the TOF is changed by the MFT. The relationship between the scattering loss and the TOF-MFT distance is measured experimentally and is in good agreement with the numerical simulations. The lengthened evanescent field of the TOF can sense the multifarious matter on a substrate which is farther from the TOF sensitively.
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