First, we will provide some recent advances on low-frequency phononic and acoustic insulators based on metasurfaces. We will introduce a new concept of acoustic absorption based on the coiling-up space design which exhibits extreme acoustic properties. A new acoustic absorber operating at 125Hz with deep-subwavelength thickness (~ λ/230) acting as an “acoustic sink” is designed and its functionalities are discussed. Second, as we are dealing with how to reduce or to absorb low-frequency sound/noise, we will explore a novel idea on the use in a positive manner these noises as a source of energy. We theoretically and numerically show the properties of a novel acoustic energy harvester resulting from the confinement and conversion of low-frequency acoustic/noise disturbances to electrical energy. We indeed present preliminary results showing a metamaterial structure producing an electrical power density of 0.54μw/cm3 for one confined frequency, which presents a very good value compared the others acoustic energy harvesting approaches.
Badreddine Assouar, Shuibao Qi, and Yong Li, "Acoustic metamaterials and metasurfaces: a transformative approach for phononic insulators and energy harvesting," Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 101112B (Presented at SPIE OPTO: February 01, 2017; Published: 27 January 2017); https://doi.org/10.1117/12.2250271.
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