Fig. 1. (a) Schematic configuration of the sensor; (b) microscopic image of the tapering structure.

Fig. 2. Schematic diagram of the RI experimental setup.

Fig. 3. (a) Reflected interference spectrum of the sensor; (b) the corresponding spatial frequency spectrum.

Fig. 4. Reflected interference spectrum for different RI liquids.

Fig. 5. (a) Resonance wavelength shifts versus RI of the sensor; (b) intensity change versus RI of the sensor.

Fig. 6. Schematic diagram of the temperature experimental setup.

Fig. 7. (a) Resonance wavelength shifts versus temperature for the sensor; (b) intensity change versus temperature for the sensor.