Ultrabroadband ventilated sound insulation metamaterial based on dual-mode Fano resonance and nonlocal coupling resonance
Phys. Rev. Applied 23, 064065 – Published 27 June, 2025
DOI: https://doi.org/10.1103/pb59-x7kk
Abstract
Classical broadband ventilated insulation metamaterials (BVSIMs) usually have a trade-off between bandwidth, efficiency, and thickness. In this paper, we propose a different design method of BVSIM based on dual-mode Fano resonance (DMFR) with a simple structure and fine performance. The bandwidth of a unit cell (ventilation rate exceeds 30%) can be adjusted arbitrarily within 1/3–1 octave by changing structural parameters based on the DMFR. The broadband sound insulation and filtering effects can be achieved by connecting different BVSIM units in series. Through the nonlocal coupling resonance (NCR) of the four-unit Fano resonance and Fabry-Pérot (FP) resonances, the supercell with NCR can achieve ultrabroadband sound insulation within 400–2450 Hz (i.e., >2.5 octaves). The thickness of the low-frequency unit is only 0.0776λ of the minimum working frequency. Our findings are demonstrated via theoretical derivation, numerical simulation, and experimental measurement, which could have a variety of practical application scenarios such as noise control, acoustic communication, and sound detection.
