Extraordinary Sound Transmission through Density-Near-Zero Ultranarrow Channels
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. 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 …