A gas sensing system comprising an array of photonic wire waveguide-based ring resonators is proposed. As a ring resonator propagates resonant lights only, parameters of the resonator can be deliberately designed such that a resonant light of the resonator is tuned with an absorption spectral line of a gas. Thus, an array of ring resonators can be used to select a series of resonant lights tuned with spectral lines of multiple gases. Simulation results show that three gases, CH4, CO2, and HF for example, are simultaneously detected by the system with high sensitivity. The gas sensing system can be fabricated as compact and portable with current fabrication technology.

Optical sensors; Gas detectors; Sensor systems and applications; Optoelectronic and photonic sensors

CENTRAL SOUTH UNIVERSITY