Refractive index sensor based on photonic quasi-crystal with concentric ring microcavity

In this paper, a refractive index sensor based on Stampfli-type photonic quasi-crystal with concentric ring microcavity is proposed. The variations of resonant wavelength and quality factor with the change of the width of concentric rings and the radius of air holes are researched. The transmission spectra of the sensor filled with analytes with different refractive index are detected, and a high sensitivity of 613 nm per refractive index unit (RIU), as well as a high quality factor of 79423, is obtained. This work will provide guidance for the application of photonic quasi-crystal microcavity in the field of optical sensing.