Phononic Thin Plates with Embedded Acoustic Black Holes
arXiv:1410.1833 · doi:10.1103/PhysRevB.91.104304
Abstract
We introduce a class of two-dimensional non-resonant single-phase phononic materials and investigate its peculiar dispersion characteristics. The material consists of a thin plate-like structure with an embedded periodic lattice of Acoustic Black Holes. The use of these periodic tapers allows achieving remarkable dispersion properties such as Zero Group Velocity in the fundamental modes, negative group refraction index, bi-refraction, and mode anisotropy. The dispersion properties are numerically investigated using a three-dimensional supercell plane wave expansion method. The effect on the dispersion characteristics of key geometric parameters of the black hole, such as the taper profile and the residual thickness, are also explored.
References in corpus (5)
- Observing Zitterbewegung for photons near the Dirac point of a two-dimensional photonic crystal
- Extremal transmission at the Dirac point of a photonic band structure
- Extremal transmission and beating effect of acoustic wave in two-dimensional sonic crystal
- Acoustic Analogue of Bloch Oscillations and Resonant Zener Tunneling in Ultrasonic Superlattices
- A passively tunable non-resonant acoustic metamaterial lens for selective ultrasonic excitation