Micro-ring resonator optical sensor based on silicon and silicon nitride waveguide

Abstract

In this paper, we compare the sensing sensitivity, the stability and the temperature sensitivity of the micro-ring resonator optical sensor based on silicon waveguide and silicon nitride waveguide. For the silicon waveguide and silicon nitride waveguide single ring, the sensing sensitivities are 1113nm/RIU and 182.64nm/RIU, the resonance wavelength variations are ±12.5pm and ±7.5pm in an hour testing at the ambient temperature and the temperature sensitivities are 0.038nm/K and 0.018nm/K, respectively. . The sensing sensitivity can be improved to 6080.6nm/RIU by cascaded double silicon nitride waveguide rings to produce Vernier effect.