Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3701611
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- U.S. Office of Naval Research
- UPV
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We present the design, construction, and experimental characterization of the acoustic analogue of the so called photonic black-hole. The fabricated sample has cylindrical symmetry and consists of two parts, a shell that bends the sound towards the center and a core that dissipates its energy. The shell is made of a metamaterial that perfectly matches the acoustic impedance of air and behaves like a gradient index lens. The experimental data obtained in a multi-modal impedance chamber demonstrate that the proposed acoustic black-hole acts like an onmidirectional broadband absorber with strong absorbing efficiency. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3701611]
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