Acoustical routing based on diffraction inhibition in two-dimensional sonic crystal

Abstract

Routing and guiding acoustic waves without diffraction broadening and backscattering losses are of great interest in the acoustic community. Here we have proposed a diffraction-immune acoustical waveguides based on diffraction inhibition in two-dimensional (2D) sonic crystals (SCs). Owing to the flat equal-frequency contour, the propagating acoustic waves can be highly localized between two neighboring rows of the SCs. A few integrated sonic circuit building blocks including arbitrary angle bends and power splitters are further designed and theoretically realized. The proposed SCs opens up possibilities for flexible controls of acoustic waves and leads to applications in integrated acoustical devices.