Fig. 1. Schematic diagram of hollow micro-bottle resonator coupled with tapered fiber and cross section of micro-bottle structure

Fig. 2. Optical field distribution of hollow micro-bottle resonator with different wall thicknesses

Fig. 3. Schematic of corrosion experimental device and cross section of quartz capillary before and after corrosion

Fig. 4. Fabrication process of hollow micro-bottle resonator

Fig. 5. Package process of sensor

Fig. 6. Transmission spectra of hollow micro-bottle resonator before and after package and stability test

Fig. 7. Schematic diagram of refractive index sensing experimental device

Fig. 8. Transmission spectrum of hollow micro-bottle resonator and its resonance peak fitting

Fig. 9. Refractive index sensing characteristics of transmission spectrum of hollow micro-bottle resonator