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Area of Science:

  • Optical Sensing
  • Resonator Technology
  • Environmental Monitoring

Background:

  • Whispering gallery mode (WGM) resonators are optical sensors for gaseous environments.
  • Their resonant properties (wavelength, amplitude, Q factor) enable rapid, stable monitoring.
  • High sensitivity, low cost, and small size make them suitable for disposable, extreme-environment sensors.

Purpose of the Study:

  • To compare the spectral response of different diameter WGM resonators to carbon dioxide (CO2) and nitrogen (N2) mixtures.
  • To characterize and quantify the effect of environmental temperature on spectral shifts.
  • To demonstrate real-time tracking and recovery capabilities of the resonator sensor.

Main Methods:

  • Spectral analysis of resonator responses to varying gas concentrations (CO2, N2).
  • Quantification of thermo-optic effects on spectral shifts.
  • Real-time monitoring of gas concentration changes.

Main Results:

  • Observed spectral shifting and broadening of cavity resonance near 1550 nm.
  • Quantified temperature-induced spectral shifts due to the thermo-optic effect.
  • Demonstrated sensor's ability to track and recover gas concentrations in real-time.

Conclusions:

  • WGM resonators show potential for sensitive, real-time gas sensing.
  • Understanding and decoupling environmental factors like temperature is crucial for accurate measurements.
  • The sensor exhibits promising tracking and recovery capabilities for dynamic gas environments.