Published in
American Physical Society, Physical Review Letters, 5(111)
DOI: 10.1103/physrevlett.111.055501
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- American Physical Society
- [infoscience.epfl.ch]
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Extraordinary Sound Transmission through Density-Near-Zero Ultranarrow Channels
,
Andrea Alù
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Abstract
We introduce the acoustic equivalent of “supercoupling” by studying the anomalous sound transmission and uniform energy squeezing through ultranarrow acoustic channels filled with zero-density metamaterials. As a realistic example, we propose their realization by inserting transverse membranes with a subwavelength period along the channel, and we prove a novel form of acoustic tunneling based on impedance matching and infinite phase velocity at the zero-density operation. We envision applications in sensing, noise control, cloaking, and energy harvesting.