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approfondimento - Acoustic Metamaterials
Acoustic Blackbody Absorption: Overcoming Causality Limits with Instability-Induced Softness
By introducing instability to reduce the static bulk modulus to zero, researchers can overcome causality-imposed limitations and achieve near-perfect acoustic blackbody absorption, suggesting that true blackbody absorption is limited only by material constraints, not fundamental physics.
基於不穩定性誘導軟化效應突破因果律限制實現聲學黑體吸收
通過將系統耦合到不穩定組件以降低其有效體積模量，可以克服聲學中由因果關係對完美吸收（黑體）施加的限制。
Acoustic Wave Amplitude Control Using Interference Phenomenon in Hybrid Geometric-Phase Meta-atom Pairs
This paper presents a novel method for continuous acoustic wave amplitude modulation by leveraging the interference phenomenon between two mode-conversion paths in a hybrid geometric-phase meta-atom (HGPM) pair, achieving nearly 100% modulation depth by simply adjusting the relative orientation angle of the meta-atoms.
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