Acoustic wave propagation and stochastic effects in metamaterial absorbers

Johan Christensen, Morten Willatzen

Research output: Contribution to journalJournal articleResearchpeer-review


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
Number of pages5
Publication statusPublished - 2014

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