Bioinspired Fano-like resonant transmission: frequency selective impedance matching
Bioinspired Fano-like resonant transmission: frequency selective impedance matching
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DOI：
10.1088/1361-6463/ad1c86
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发表时间：
2024-01
期刊：
影响因子：
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通讯作者：
Gennaro Andrea Esposito;Domenico Tallarico;Moustafa Sayed Ahmed;M. Miniaci;S. Shahab;Andrea Bergamini
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文献类型：
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作者：
Gennaro Andrea Esposito;Domenico Tallarico;Moustafa Sayed Ahmed;M. Miniaci;S. Shahab;Andrea Bergamini
在构建声学设备以获得最佳性能时，研究设备与其周围环境之间的阻抗失配至关重要。实际上，高阻抗失配会阻止能量在界面上传输，从而限制设备可以处理的能量。通常，这可以通过使用声阻抗匹配层（例如梯度）来解决，类似于光学涂层中所做的。这种梯度的最简单形式可以被认为是在两种介质之间具有一定质量的中间层，以进行阻抗匹配，并且需要考虑的最低频率的至少四分之一波长的最小厚度。（有限的）可用弹性特性和密度的期望组合传统上决定了材料选择。自然，这同样是有限数量的材料在生物结构的建设中使用的限制，展示了一个独特的方法，其中设计空间是通过修改某些几何和/或材料参数扫描。哺乳动物的中耳和鱼类的侧线都是这种方法的实例，后者已经包含分布式阻抗匹配水下层的架构。在本文中，我们开发了一种谐振机制，其属性可以修改，以在不同的频率下，通过调整一个小的几何参数集的阻抗匹配。所讨论的机制，如侧线器官，旨在作为创建阻抗匹配元表面的基础。计算研究和参数优化表明，该结构可以在深亚波长范围内实现水和空气的阻抗匹配。
The study of the impedance mismatch between the device and its surroundings is crucial when building an acoustic device to obtain optimal performance. In reality, a high impedance mismatch would prohibit energy from being transmitted over the interface, limiting the amount of energy that the device could treat. In general, this is solved by using acoustic impedance matching layers, such as gradients, similar to what is done in optical coatings. The simplest form of such a gradient can be considered as an intermediate layer with certain qualities resting between the two media to impedance match, and requiring a minimum thickness of at least one quarter wavelength of the lowest frequency under consideration. The desired combination(s) of the (limited) available elastic characteristics and densities has traditionally determined material selection. Nature, which is likewise limited by the use of a limited number of materials in the construction of biological structures, demonstrates a distinct approach in which the design space is swept by modifying certain geometrical and/or material parameters. The middle ear of mammals and the lateral line of fishes are both instances of this method, with the latter already incorporating an architecture of distributed impedance matched underwater layers. In this paper, we develop a resonant mechanism whose properties can be modified to give impedance matching at different frequencies by adjusting a small set of geometrical parameters. The mechanism in question, like the lateral line organ, is intended to serve as the foundation for the creation of an impedance matching meta-surface. A computational study and parameter optimization show that it can match the impedance of water and air in a deeply sub-wavelength zone.