Visco-thermal effects in acoustic metamaterials: from total transmission to total reflection and high absorption
Visco-thermal effects in acoustic metamaterials: from total transmission to total reflection and high absorption
We theoretically and experimentally investigate visco–thermal effects on the acoustic propagation through metamaterials consisting of rigid slabs with subwavelength slits embedded in air. We demonstrate that this unavoidable loss mechanism is not merely a refinement, but that it plays a dominant role in the actual acoustic response of the structure. …