Active electroacoustic resonators with negative acoustic properties

Hervé Lissek (1) , Romain Boulandet (1)

1 EPFL - Ecole Polytechnique Fédérale de Lausanne

Acoustic metamaterials constitute a new class of acoustic structures, composed of periodic arrangements of engineered unit-cells, that exhibit macroscopic acoustic properties not readily available in nature. These properties can either be a negative mass density or a negative bulk modulus. However, these artificial behaviours derive from the engineered arrangement of the unit-cells, which do not present individual ''meta-properties'', rather than from their intrinsic nature. It is although possible to achieve intrinsic metamaterial properties out of a single unit-cell, according to active control techniques, such as direct impedance control. This paper intends to highlight the metamaterial nature of such active concepts, justifying some interesting analogies between the latter and the theory of acoustic metamaterials.

Mots clés: acoustic metamaterials; active acoustic impedance control; negative refraction

Domaines: Acoustique [physics.class-ph]

Hervé Lissek, Romain Boulandet. Active electroacoustic resonators with negative acoustic properties. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810620⟩