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

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