The elastic modes coupling in phononic crystals and acoustically induced transparency

Abstract

Based on the phononic crystal slab resonators, a new structure is proposed which has the operation similar to electromagnetically induced transparency (EIT) in the optical domain. This structure includes two resonance microcavities and interacts with each other. Due to the interaction between two microcavities, the transmission coefficient will be off while in noninteracting case it is on. Finite element method (FEM) is utilized to simulate the performance of the structure. The transmission spectrum of the structure is investigated in different states such as different coupling between two resonators. Also, it is shown that with control the coupling coefficient between two cavities, the acoustic transmission will be controlled especially in the resonance frequency of the cavities before coupling. Finally, the nonlinear properties of this phononic structure are investigated and the changes in the mass density due to this nonlinearity are discussed.