title: Introduction to the special issue on acoustic metamaterials.
authors.affiliation: Applied Research Laboratories and Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78758, USA.
authors.forename: Michael R
authors.initials: MR
authors.lastname: Haberman
authors.affiliation: Mechanical and Aerospace Engineering, Rutgers University, Piscataway, New Jersey 08854, USA.
authors.forename: Andrew N
authors.initials: AN
authors.lastname: Norris