Broadband Low-Frequency Near-Perfect Sound Absorber via Coupled Metasurfaces
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914173521231872 |
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| author | Lyu, Keqiang Farhat, Mohamed Wu, Ying |
| author_facet | Lyu, Keqiang Farhat, Mohamed Wu, Ying |
| contents | We propose a simple yet effective method for low-frequency broadband acoustic absorption. The absorber consists of two concentric space-coiling resonators with distinct resonance frequencies, with the inner resonator characterized by a low-quality factor (Q) and the outer resonator by a high Q factor. The coupling between the two resonators enables efficient broadband absorption within a deep-subwavelength range exceeding 15 times the structural thickness. Numerical simulations, theoretical analysis, and experimental measurements demonstrate that highly efficient (greater than 80 percent) low-frequency broadband absorption is achieved in the range of 198-315 Hz, as well as a 58 percent fractional bandwidth spanning 183-334 Hz. Furthermore, with the outer dimension fixed, adjusting the parameters of the internal resonators enables flexible tuning of the absorption band across a broad frequency range. This work presents a powerful design methodology that eliminates the need for traditional complex spatially arranged multi-resonator assemblies. By employing a single class of resonant units, thin and efficient broadband absorbers can be achieved, offering various application prospects in the field of low-frequency sound absorption. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_22563 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Broadband Low-Frequency Near-Perfect Sound Absorber via Coupled Metasurfaces Lyu, Keqiang Farhat, Mohamed Wu, Ying Optics Applied Physics We propose a simple yet effective method for low-frequency broadband acoustic absorption. The absorber consists of two concentric space-coiling resonators with distinct resonance frequencies, with the inner resonator characterized by a low-quality factor (Q) and the outer resonator by a high Q factor. The coupling between the two resonators enables efficient broadband absorption within a deep-subwavelength range exceeding 15 times the structural thickness. Numerical simulations, theoretical analysis, and experimental measurements demonstrate that highly efficient (greater than 80 percent) low-frequency broadband absorption is achieved in the range of 198-315 Hz, as well as a 58 percent fractional bandwidth spanning 183-334 Hz. Furthermore, with the outer dimension fixed, adjusting the parameters of the internal resonators enables flexible tuning of the absorption band across a broad frequency range. This work presents a powerful design methodology that eliminates the need for traditional complex spatially arranged multi-resonator assemblies. By employing a single class of resonant units, thin and efficient broadband absorbers can be achieved, offering various application prospects in the field of low-frequency sound absorption. |
| title | Broadband Low-Frequency Near-Perfect Sound Absorber via Coupled Metasurfaces |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2511.22563 |