Investigation of a novel silicon-on-insulator Rib-Slot photonic sensor based on the vernier effect and operating at 3.8 µmB. Troia and V. M. N. PassaroJ. Eur. Opt. Soc.-Rapid Publ., 9 (2014) 14005DOI: https://doi.org/10.2971/jeos.2014.14005