Abstract
Moth wings are multifunctional bio-composite structures serve varied purposes, including sound absorption and flight. Inspired by this, we propose a metasurface for reflective acoustic wave modulation. The metasurface features periodically arranged resonant elements, consisting of perforated plates and resonant cavities, mimicking moth wing scales. The hinged connection between the resonant elements and the background structure allows for precise and wide-range tuning of sound amplitude and phase, and enables deployment on irregular surfaces. We present three detailed metasurface designs, showcasing various structural parameters to demonstrate their quantitative manipulation of sound amplitude and phase, both individually and simultaneously. In addition to conventional energy absorption and path manipulation functions, the metasurface also highlights several striking features, including wavefront tailoring and reflection shunting, as demonstrated through numerical simulations. This study offers novel insights into the precise control of wave amplitude and phase over diverse scales and terrains, whilst also presenting a practical implementation in the field of acoustics.
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