Underwater acoustic self-focusing and bending in conformal Mikaelian lens by pentamode metafluid

Abstract

Abstract In this paper, we present the design of an arc-shaped Mikaelian lens using conformal transformation acoustics. We have derived the propagation trajectory equation for vertically incident rays within the lens. The ray trajectories inside the designed lens exhibit the feature of self-focusing as well as of deflection of the propagation direction. The microstructure design of the lens is realized using pentamode material unit cells, which provide the necessary property for underwater acoustic wave manipulation. The simulation results demonstrate that the designed lens has a good self- focusing effect and can deflect the propagation direction of incident waves at the same time. The pentamode conformal Mikaelian lens shows potential applications in underwater imaging, detection and communication.