Acoustic wave propagation and stochastic effects in metamaterial absorbers

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 attenuatio...

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Bibliographic Details
Published in:	Applied physics letters Vol. 105; no. 4
Main Authors:	Christensen, J., Willatzen, M.
Format:	Journal Article
Language:	English
Published:	Melville American Institute of Physics 28-07-2014
Subjects:	ABSORPTION Acoustic absorption Acoustic noise Acoustic propagation ANISOTROPY Applied physics APPROXIMATIONS ATTENUATION Broadband CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY CORRELATIONS IRRADIATION Mathematical models Metamaterials NOISE Sound transmission SOUND WAVES STOCHASTIC PROCESSES WAVE PROPAGATION
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Summary:	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.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.4892011