Physical modeling and validation of porpoises' directional emission via hybrid metamaterials

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Date
2019-07-22
Authors
Dong, Erqian
Zhang, Yu
Song, Zhongchang
Zhang, Tianye
Cai, Chen
Fang, Nicholas X.
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DOI
10.1093/nsr/nwz085
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Keywords
porpoise's physical model
metamaterials
biosonar
directional emission
Abstract
In wave physics and engineering, directional emission sets a fundamental limitation on conventional simple sources as their sizes should be sufficiently larger than their wavelength. Artificial metamaterial and animal biosonar both show potential in overcoming this limitation. Existing metamaterials arranged in periodic microstructures face great challenges in realizing complex and multiphase biosonar structures. Here, we proposed a physical directional emission model to bridge the gap between porpoises’ biosonar and artificial metamaterial. Inspired by the anatomical and physical properties of the porpoise's biosonar transmission system, we fabricated a hybrid metamaterial system composed of multiple composite structures. We validated that the hybrid metamaterial significantly increased directivity and main lobe energy over a broad bandwidth both numerically and experimentally. The device displayed efficiency in detecting underwater target and suppressing false target jamming. The metamaterial-based physical model may be helpful to achieve the physical mechanisms of porpoise biosonar detection and has diverse applications in underwater acoustic sensing, ultrasound scanning, and medical ultrasonography.
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© The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Dong, E., Zhang, Y., Song, Z., Zhang, T., Cai, C., & Fang, N. X. Physical modeling and validation of porpoises' directional emission via hybrid metamaterials. National Science Review, 6(5), (2019): 921-928, doi:10.1093/nsr/nwz085.
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Dong, E., Zhang, Y., Song, Z., Zhang, T., Cai, C., & Fang, N. X. (2019). Physical modeling and validation of porpoises' directional emission via hybrid metamaterials. National Science Review, 6(5), 921-928.
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