Acoustic Whispering Gallery Modes in a Split Ring Resonator

In this work the Finite Element Method was used to numerically investigate the resonant frequencies for the acoustic Whispering Gallery Modes in a split ring type resonator. This is the case where a defect is considered in the ring resonator and the study was focused on how the resonant frequencies are affected by the presence of the defect in the ring. The findings of this study show that a kind of degeneration appears on the modes of the ring due to the insertion of the defect. The Acoustic Quality factors of the resonances were also calculated and were found to have high values proving a strong enhancement of the field. The strong enhancement of the field is also followed by the observation of intense localization of it into the defect. The results of our study show strong evidence that the proposed structure could be a very promising candidate for applications based on acoustic signals such as sensors and filters.