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Showing 1–3 of 3 results
Advanced filters: Author: Sichao Qu Clear advanced filters

  • Absorption in one-port passive systems is known to be bound by causality constraints. Here, authors study reflection and transmission of a two-port system to introduce a generalized causality constraint based on duality symmetry. Experimentally, the broadened bandwidth of their meta-absorbers shows the untapped absorption potential of broadband acoustic metamaterials.

    • Sichao Qu
    • Min Yang
    • Nicholas X. Fang
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-11

  • The authors present a soft metalens (SML) with tungsten-gel composite for ultra-broadband transcranial focus, significantly enhancing intracranial sound pressure and spatial resolution. This breakthrough advances underwater sonar, medical ultrasound imaging, and non-invasive detection for energy transmission.

    • Erqian Dong
    • Tianye Zhang
    • Yu Zhang
    ResearchOpen Access
    Nature Communications
    Volume: 16, P: 1-13

  • Causality has fundamentally restricted perfect sound absorption and radiation. This work shows how engineered instability can bypass these constraints, enabling near-perfect acoustic blackbody behavior through a universal theoretical framework validated across different physical implementations.

    • Min Yang
    • Sichao Qu
    • Shuyu Chen
    ResearchOpen Access
    Communications Physics
    Volume: 8, P: 1-9