Fig. 1. The structure of the sensor

Fig. 2. The reflection spectrum of the sensor

Fig. 3. The test system of pressure response

Fig. 4. Pressure response of the sensor at room temperature

Fig. 5. Pressure response of the sensor at -196℃

Fig. 6. The change of the cavity length from room temperature to -196℃

Fig. 7. The relative strain of fused silica

Fig. 8. The cavity length at room temperature and atmospheric pressure