title: Measurement of a broadband negative index with space-coiling acoustic metamaterials.
abstract: We report the experimental demonstration of a broadband negative refractive index obtained in a labyrinthine acoustic metamaterial structure. Two different approaches were employed to prove the metamaterial negative index nature: one-dimensional extractions of effective parameters from reflection and transmission measurements and two-dimensional prism-based measurements that convincingly show the transmission angle corresponding to negative refraction. The transmission angles observed in the latter case also agree very well with the refractive index obtained in the one-dimensional measurements and numerical simulations. We expect this labyrinthine metamaterial to become the unit cell of choice for practical acoustic metamaterial devices that require broadband and significantly negative indices of refraction.
authors.affiliation: Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA.
authors.forename: Yangbo
authors.initials: Y
authors.lastname: Xie
authors.forename: Bogdan-Ioan
authors.initials: BI
authors.lastname: Popa
authors.forename: Lucian
authors.initials: L
authors.lastname: Zigoneanu
authors.forename: Steven A
authors.initials: SA
authors.lastname: Cummer