Abstract
Realizing direction-dependent energy responses greatly benefits the construction of switching and logic devices. This study proposes an archetype for an acoustic resonant-tunneling diode, made of mode-selective resonant metamaterial. Using this material, the authors experimentally demonstrate a broadband, high contrast ratio and single-mode unidirectional sound tunneling. This result is expected to impact control methodology in biomedical ultrasonography, acoustic communication, sound identification, and noise control.
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