5 April 2017 Acoustic vortex beam generation using a compact metamaterial aperture
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Abstract
We have previously demonstrated an acoustic vortex wave antenna (VWA) based on a metamaterial aperture. This system produced arbitrary angular mode number waveforms,1 but did not produce pure integer mode vortex waves. In this work we extend our previous result to a design which radiates pure integer vortex modes. By combining an acoustic leaky wave antenna with a ring resonator waveguide we produce integer mode acoustic vortex waves. Further, we computationally show that this spatial mode can be transferred between two opposing acoustic vortex wave antenna in a "pitch - catch" configuration.
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Charles A. Rohde, Christina J. Naify, Matthew D. Guild, Theodore P. Martin, Jeffrey S. Rogers, David C. Calvo, Gregory J. Orris, "Acoustic vortex beam generation using a compact metamaterial aperture", Proc. SPIE 10170, Health Monitoring of Structural and Biological Systems 2017, 101701I (5 April 2017); doi: 10.1117/12.2260164; https://doi.org/10.1117/12.2260164
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