Underwater Willis lens for broadband low-frequency focusing
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908284937568256 |
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| author | Oh, Beomseok Lee, Dongwoo Choo, Yeon-Seong Byun, Sung-Hoon Shin, Jehyeon Kim, Sea-Moon Rho, Junsuk |
| author_facet | Oh, Beomseok Lee, Dongwoo Choo, Yeon-Seong Byun, Sung-Hoon Shin, Jehyeon Kim, Sea-Moon Rho, Junsuk |
| contents | Broadband underwater sound focusing in the low-frequency range is essential for various applications such as battery-free environmental monitoring and sensing. However, achieving low-frequency underwater focusing typically necessitates bulky, heavy structures that hinder practical deployment. Here, we introduce a three-dimensional underwater lens comprising cavity-based locally resonant asymmetric structures, enabling the efficient manipulation of low-frequency waterborne sound through a densely packed lattice configuration. We experimentally validated its broadband focusing performance over a range of 20-35 kHz. In addition, we observed that our lens exhibits asymmetric backscattering-a distinctive effect arising from its bianisotropic nature-which we term the Willis lens. Unlike conventional underwater lenses that rely on fully filled structures, our design employs cavity-based scatterers, achieving a lighter yet robust focusing performance. With its lightweight, efficient, and reliable design, the Willis lens provides a promising platform for underwater sensor networks and future advancements in on-demand waterborne sound focusing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_20196 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Underwater Willis lens for broadband low-frequency focusing Oh, Beomseok Lee, Dongwoo Choo, Yeon-Seong Byun, Sung-Hoon Shin, Jehyeon Kim, Sea-Moon Rho, Junsuk Mesoscale and Nanoscale Physics Broadband underwater sound focusing in the low-frequency range is essential for various applications such as battery-free environmental monitoring and sensing. However, achieving low-frequency underwater focusing typically necessitates bulky, heavy structures that hinder practical deployment. Here, we introduce a three-dimensional underwater lens comprising cavity-based locally resonant asymmetric structures, enabling the efficient manipulation of low-frequency waterborne sound through a densely packed lattice configuration. We experimentally validated its broadband focusing performance over a range of 20-35 kHz. In addition, we observed that our lens exhibits asymmetric backscattering-a distinctive effect arising from its bianisotropic nature-which we term the Willis lens. Unlike conventional underwater lenses that rely on fully filled structures, our design employs cavity-based scatterers, achieving a lighter yet robust focusing performance. With its lightweight, efficient, and reliable design, the Willis lens provides a promising platform for underwater sensor networks and future advancements in on-demand waterborne sound focusing. |
| title | Underwater Willis lens for broadband low-frequency focusing |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2503.20196 |