Remote temperature sensing based on self-expanding milli bubble resonators

Double port self-expanding millibubble resonators based on interior thermal air expansion was fabricated. Using the fabricated self-expanding bubble resonator and tapered fiber, whispering gallery modes (WGMs) coupling was realized. Furthermore, the fabricated double port bubble resonator was employed to conduct remote temperature sensing based on remote pressure variation caused by temperature change. Airflow caused by remote pressure variation reduced the inner pressure of bubble resonator and blue mode shift in transmission spectra was generated. Under 50°C temperature change, 39pm blue mode shift was detected and the corresponding sensitivity is about 0.8pm/°C. The feasibility of all-optical sensing based on remote temperature change is confirmed, which is anticipated to find applications in remote fire warning, dangerous chemical storage warning, etc.