Fig. 1. Basic principle of WGM^[7]

Fig. 2. FSR and Δν schematic diagram^[12]

Fig. 3. Various coupling methods^[12]

Fig. 4. The experimental setup diagram^[23]

Fig. 5. PrSchematic diagram of biological detection system using WGM microsphere resonator^[36]

Fig. 6. The experimental setup diagram^[39]

Fig. 7. Scanning electron microscopy image and experimental setup diagram^[43]

Fig. 8. Schematic diagram of fiber optic cone and microsphere packaging^[44]

Fig. 9. Schematic diagram of hollow microbubble resonator^[45]

Fig. 10. Schematic diagram of capillary microcavity DNA testing^[12]