Mid-infrared GaAs/AlGaAs micro-ring resonators characterized thermal tuning.

Micro-ring resonators with a decoupling waveguide have been manufactured from GaAs/AlGaAs, accommodating mid-infrared wavelengths, and were characterized thermal tuning. A -factor of 1900, a thermal full width at half maximum of 8 °C, and a thermal free spectral range of 18 °C have been achieved. The low -factor indicates comparatively high coupling efficiency from the input waveguide into the decoupling waveguide. The micro-ring resonators shown herein are suitable structures for advanced mid-infrared chem/bio sensing strategies resonant-cavity enhancement. In addition, they offer high spectral resolution for evanescent field sensing strategies effective wavelength de-multiplexing waveguide structures.