Fig. 1. Schematic diagram of OMC structure

Fig. 2. Mode field distributions. (a) Odd mode; (b) even mode

Fig. 3. Simulation results of DTP of OMC. (a) Relationship between ERI of two modes and OMC diameter; (b) relationship between G and wavelength; (c) transmission spectrum of OMC with diameter of 1.4 μm

Fig. 4. FSR simulation results of OMC. (a) Transmission spectra of OMC with different diameters; (b) relationship between FSR and diameter of OMC

Fig. 5. Microscope images of OMC. (a) Complete microscope image; (b) cone area; (c) waist area

Fig. 6. Structural diagram of through-hole cantilever beam based on OMC

Fig. 7. Experimental results of axial strain of OMC. (a) Spectra of OMC with diameter of 1.6 μm under different axial strains; (b) axial strain sensitivities of different interference peaks or valleys

Fig. 8. Axial strain sensitivity of OMC with different diameters around 1550 nm

Fig. 9. OMC vibration sensing experimental system

Fig. 10. Orthogonal working point of spectrum of OMC vibration sensor

Fig. 11. Amplitude-frequency response of OMC vibration sensor with DTP in frequency range of 30-3500 Hz(inset shows response before the first-order resonant frequency)

Fig. 12. Time domain signals and frequency domain signals of sensor at different frequencies. Time domain signals with frequencies of（a）40，（c）300，and（e）2000 Hz；frequency domain signals with frequencies of（b）40，（d）100，and（f）2000 Hz

Fig. 13. Results of sensor acceleration test. (a) Time-domain waveforms of sensor under different accelerations at 35 Hz; (b) sensor acceleration sensitivities at 30, 35, and 40 Hz