title: An invisible acoustic sensor based on parity-time symmetry.
abstract: Sensing an incoming signal is typically associated with absorbing a portion of its energy, inherently perturbing the measurement and creating reflections and shadows. Here, in contrast, we demonstrate a non-invasive, shadow-free, invisible sensor for airborne sound waves at audible frequencies, which fully absorbs the impinging signal, without at the same time perturbing its own measurement or creating a shadow. This unique sensing device is based on the unusual scattering properties of a parity-time (PT) symmetric metamaterial device formed by a pair of electro-acoustic resonators loaded with suitably tailored non-Foster electrical circuits, constituting the acoustic equivalent of a coherent perfect absorber coupled to a coherent laser. Beyond the specific application to non-invasive sensing, our work broadly demonstrates the unique relevance of PT-symmetric metamaterials for acoustics, loss compensation and extraordinary wave manipulation.
authors.affiliation: Department of Electrical &Computer Engineering, The University of Texas at Austin, 1616 Guadalupe Streeet, Austin, Texas 78701, USA.
authors.forename: Romain
authors.initials: R
authors.lastname: Fleury
authors.affiliation: Department of Electrical &Computer Engineering, The University of Texas at Austin, 1616 Guadalupe Streeet, Austin, Texas 78701, USA.
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Sounas
authors.affiliation: Department of Electrical &Computer Engineering, The University of Texas at Austin, 1616 Guadalupe Streeet, Austin, Texas 78701, USA.
authors.forename: Andrea
authors.initials: A
authors.lastname: Alù