Ultrasonic metamaterials with negative modulus

Nicholas Fang, Dongjuan Xi, Jianyi Xu, Muralidhar Ambati, Werayut Srituravanich, Cheng Sun, Xiang Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1684 Scopus citations


A new class of ultrasonic metamaterials is finding different applications as their negative dynamic modulus leads to near to surface states with very large wavevectors. These materials have strong dispersive characteristics of elastic modulus with subwavelength resonant structural units, which leads to a bulk mode propagating in the cluster of the units with group velocity antiparallel to the phase advancement. A set of underwater ultrasonic transmission experiments were carried out on one dimensional daisy-chained samples to characterize the unique propagation properties of acoustic waves in the ultrasonic metamaterials. The negative modulus can introduce resonant surface modes, which have very large wavevectors at the interface between two materials of opposite signs of modulus. The artificial ultrasonic metamaterials offer many opportunities in acoustic imaging below the diffraction limit.

Original languageEnglish (US)
Pages (from-to)452-456
Number of pages5
JournalNature materials
Issue number6
StatePublished - Jun 10 2006

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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