Abstract
The supercoupling effect, which enables wave transmission through a subwavelength tunnel, has various applications, including subwavelength focusing and energy harvesting and sensing. We constructed a metamaterial with a density near zero using a membrane as a lumped element and created a subwavelength acoustic tunnel. Although this tunnel has a diameter of λ/40 and a cross-sectional area of only 2.25% of that of the normal waveguides connected to the channel, the tunnel acts as a nearly perfect acoustic supercoupler by transmitting 95.1% of the incident acoustic energy without a phase delay. These results could open up new possibilities for developing various devices in fields that use acoustic waves such as noise control, signal processing and medical imaging.
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