Tunable acoustic hooks from Janus cylinder

Abstract

In this paper we present a new way to obtain tunable acoustic hooks. The breaking of the symmetry of the material composition is used for the generation of acoustic hooks from Janus cylinders. This fact is possible by using sonic crystals to vary the refractive index of two half-cylinders. The study has been carried out numerically, using the Finite Element Method. By changing the contrast of refractive indexes between the two half-cylinders or by rotating the Janus cylinder, acoustic hooks can be obtained that can be tunable with bending angle ranging from 1° to 21°. Full Width at Half-Maximum can be obtained with values close to the diffraction limit. This structure provides an efficient method to precisely tune the acoustic hook depending on it use.

Keywords

• Acoustic hook
• Janus cylinder
• Acoustojet
• Sonic crystal