Parity-Time Acoustic Metamaterials and Unidirectional Invisible Sensors

We theoretically and experimentally investigate the unique scattering properties of parity-time acoustic systems. We observe acoustic invisibility of airborne sound at audible frequencies in a parity-time symmetric meta-molecule made of perfectly balanced gain and loss subunits. This is achieved in a waveguide configuration using electro-acoustic resonators loaded with non-Foster elements, which are tailored to induce invisibility at the design frequency. This unidirectional reflectionless system is fully stable and self-sensing, allowing for robust implementation of parity-time acoustic metamaterials for loss compensation, non-invasive sensing and advanced acoustic signal manipulation.

Presented at:
Metamaterials 2014, Copenhagen, Denmark, August 25-30, 2014

 Record created 2016-11-22, last modified 2018-01-28

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