We present a method to realise a wide class of caustics in acoustic fields created by a set of phase holograms realized with metasurfaces. Given the desired caustic shape, we discuss how to identify the phase distribution along the metasurfaces and describe the calculations needed for determining the pressure field in the vicinity of the caustic. The results of this work can be used in realising acoustic traps controllable with acoustic metamaterials.
Funding
AURORA: Controlling sound like we do with light; G2448; EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL; EP/S001832/1
Manipulating Acoustic wavefronts using metamaterials for novel user interfaces; G2388; EUROPEAN UNION; 787413