title: Asymmetric Acoustic Propagation of Wave Packets Via the Self-Demodulation Effect.
abstract: This Letter presents the experimental characterization of nonreciprocal elastic wave transmission in a single-mode elastic waveguide. This asymmetric system is obtained by coupling a selection layer with a conversion layer: the selection component is provided by a phononic crystal, while the conversion is achieved by a nonlinear self-demodulation effect in a 3D unconsolidated granular medium. A quantitative experimental study of this acoustic rectifier indicates a high rectifying ratio, up to 10^{6}, with wide band (10 kHz) and an audible effect. Moreover, this system allows for wave-packet rectification and extends the future applications of asymmetric systems.
authors.affiliation: LUNAM Université, Université du Maine, CNRS, LAUM UMR 6613, avenue O. Messiaen, 72085 Le Mans, France.
authors.forename: Thibaut
authors.initials: T
authors.lastname: Devaux
authors.affiliation: LUNAM Université, Université du Maine, CNRS, LAUM UMR 6613, avenue O. Messiaen, 72085 Le Mans, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Tournat
authors.affiliation: LUNAM Université, Université du Maine, CNRS, LAUM UMR 6613, avenue O. Messiaen, 72085 Le Mans, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Richoux
authors.affiliation: LUNAM Université, Université du Maine, CNRS, LAUM UMR 6613, avenue O. Messiaen, 72085 Le Mans, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Pagneux