Measurement of a broadband negative index with space-coiling acoustic metamaterials.


Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Xie, Y; Popa, B-I; Zigoneanu, L; Cummer, SA

Published Date

  • April 22, 2013

Published In

Volume / Issue

  • 110 / 17

Start / End Page

  • 175501 -

PubMed ID

  • 23679743

Pubmed Central ID

  • 23679743

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.110.175501


  • eng