Fleury, RomainAlù, Andrea2016-11-222016-11-222016-11-22201310.1103/PhysRevLett.111.055501https://infoscience.epfl.ch/handle/20.500.14299/131526We 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.text::journal::journal article::research article