Angular control of acoustic waves oblique incidence by phononic crystals based on Dirac cones at the Brillouin zone boundary

摘要

AbstractThis study investigated the angular control of incident acoustic waves for total transmission and reversed reflection using phononic crystals (PnCs). The Dirac point appears at the Brillouin zone boundary. The position of the Dirac point regularly changes with the length–width ratio of rubber rods, which makes the transmission angle adjustable. These structures could be applied to an acoustical 0 orπphase modulator by adjusting the number of layers of PnCs (even or odd). The angular control in the reflection domain can be achieved by adding a meta-surface at the boundary of the PnC.Highlights?Provides a new method for the total transmission and reversed reflection of oblique incidence on phononic crystals.?The position of the Dirac point regularly changes, which makes the transmission angle and phase adjustable.?Designing a new meta-surface at the surface of the phononic crystal to achieve oblique incident wave reversed reflection.]]>