Characterization of an underwater metamaterial made of aluminum honeycomb panels at low frequencies

Colby W. Cushing, Preston S. Wilson, Michael R. Haberman, Chen Shen, Junfei Li, Steven A. Cummer, Zheng Jie Tan, Chu Ma, Huifeng Du, Nicholas X. Fang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This paper presents a method to characterize the effective properties of inertial acoustic metamaterial unit cells for underwater operation. The method is manifested by a fast and reliable parameter retrieval procedure utilizing both numerical simulations and measurements. The effectiveness of the method was proved to be self-consistent by a metamaterial unit cell composed of aluminum honeycomb panels with soft rubber spacers. Simulated results agree well with the measured responses of this metamaterial in a water-filled resonator tube. A sub-unity density ratio and an anisotropic mass density are simultaneously achieved by the metamaterial unit cell, making it useful in implementations of transformation acoustics. The metamaterial, together with the approach for its characterization, are expected to be useful for underwater acoustic devices.

Original languageEnglish (US)
Pages (from-to)1829-1837
Number of pages9
JournalJournal of the Acoustical Society of America
Issue number3
StatePublished - Mar 1 2021

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics


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