Acoustic wave propagation and stochastic effects in metamaterial absorbers

Johan Christensen, Morten Willatzen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We show how stochastic variations of the effective parameters of anisotropic structured metamaterials can lead to increased absorption of sound. For this, we derive an analytical model based on the Bourret approximation and illustrate the immediate connection between material disorder and attenuation of the averaged field. We demonstrate numerically that broadband absorption persists at oblique irradiation and that the influence of red noise comprising short spatial correlation lengths increases the absorption beyond what can be archived with a structured but
ordered system.
Original languageEnglish
Article number043508
JournalApplied Physics Letters
Volume105
Number of pages5
ISSN0003-6951
DOIs
Publication statusPublished - 2014

Fingerprint Dive into the research topics of 'Acoustic wave propagation and stochastic effects in metamaterial absorbers'. Together they form a unique fingerprint.

Cite this