Abstract
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.
Highlights
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 problem of creating a desired acoustic field from the waves going through a single metasurface has been addressed by many [1], with solutions ranging from ray-tracing [2] to back-propagation [3]
Summary
The problem of creating a desired acoustic field from the waves going through a single metasurface has been addressed by many [1], with solutions ranging from ray-tracing [2] to back-propagation [3]. 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.
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