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Gradient index (GRIN) acoustic devices have spatially inhomogeneousrefractive index profile and allow flexible control of the propagation ofacoustic waves. Previous GRIN acoustic lenses are mostly inherentlytwo-dimensional designs that are difficult to be extended to all threedimensions. Besides, manually designing the spatially inhomogeneous structureis both time-consuming and error-prone. In this work, we proposed andnumerically verified an automated computer-aided design tool: GRadient IndexPick-and-Place (GRIPP) algorithm, for generating three-dimensional GRINacoustic wave controlling devices with scalable and 3D printable structures.The algorithm receives as inputs a spatial distribution of refractive index anda pre-defined library of gradient index unit cells, and outputs a 3D model ofGRIN device that is ready to be 3D printed. The tool enables rapid design andrealization of a large variety of 3D GRIN acoustic devices, which can be usefulin areas such as speaker system design, airborne ultrasonic sensing, as well astherapeutic ultrasound.

GRIPP: an automated computer-aided design tool for generating 3D printable gradient index acoustic devices