Extraordinary Sound Transmission through Density-Near-Zero Ultranarrow Channels

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.


Published in:
Physical Review Letters, 111, 5
Year:
2013
Publisher:
American Physical Society
ISSN:
1079-7114
Laboratories:




 Record created 2016-11-22, last modified 2018-12-03


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