A 1.3-centimeter multi-coiled metasurface absorbs 99.99% of sound at 50 Hz, reaching a thickness of λ/527, by combining a coiled chamber with internal labyrinthine passages.
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Extreme Low-Frequency Ultrathin Acoustic Absorbing Metasurface
A 1.3-centimeter multi-coiled metasurface absorbs 99.99% of sound at 50 Hz, reaching a thickness of λ/527, by combining a coiled chamber with internal labyrinthine passages.