5 April 2017 Isotropic transformation acoustics and applications
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Abstract
A novel class of acoustic metamaterial is proposed for directional collimation of a cylindrical source into a plane wave beam. The effect is based on transformation acoustics which retains the exact form of the wave equation under conformal mapping from a circular region to a triangular area. The transformation is adjustable, allowing the acoustic energy to be equally radiated in three directions, or preferentially in a single direction. Importantly, the material properties in the physical domain are isotropic and therefore practically realizable. Two example devices are proposed using cylindrical elastic shells in water as the metamaterial elements and demonstrated using full wave simulations. This approach has potential applications beyond acoustic antenna design in beam-steering and wavefront manipulation.
Conference Presentation
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Xiaoshi Su, Andrew N. Norris, "Isotropic transformation acoustics and applications", Proc. SPIE 10170, Health Monitoring of Structural and Biological Systems 2017, 101700M (5 April 2017); doi: 10.1117/12.2259793; https://doi.org/10.1117/12.2259793
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