We demonstrate a nonadiabatic microfiber sensor with a taper diameter of few micrometers. The modal interference caused by the abrupt taper results in a sinusoidal spectral response. The wavelength shift arising from the changes in the external refractive index is found to be significant with a maximum sensitivity of 18681.82nm/RIU achieved. The measured results show a good agreement with the theoretical predictions. The high sensitivity and the simplicity offer the sensor the potential for many real applications.
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