the sensitivity and the limit of detection (LOD) of chemical, biochemical and gas photonic
sensors. In this paper a review of compact and efficient photonic sensors based on the
Vernier effect is presented. The most relevant results of several theoretical and experimental
works are reported, and the theoretical model of the typical Vernier effect-based sensor is
discussed as well. In particular, sensitivity up to 460 μm/RIU has been experimentally …