Wavefront modulation of water surface wave by a metasurface

We design a planar metasurface to modulate the wavefront of a water surface wave（WSW） on a deep sub-wavelength scale. The metasurface is composed of an array of coiling-up-space units with specially designed parameters, and can take on the work of steering the wavefront when it is pierced into water...

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Bibliographic Details
Published in:Chinese physics B 2015-10, Vol.24 (10), p.292-296
Main Author: 孙海涛 程营 王敬时 刘晓峻
Format: Article
Language:English
Subjects:
Arrays
Channels
Coiling
Modulation
Refraction
Snell定律
Steering
Surface waves
Wave fronts
亚波长
单位
水面波
波前
波纹通道
能量提取
调制
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Summary:We design a planar metasurface to modulate the wavefront of a water surface wave（WSW） on a deep sub-wavelength scale. The metasurface is composed of an array of coiling-up-space units with specially designed parameters, and can take on the work of steering the wavefront when it is pierced into water. Like their acoustic counterparts, the modulation of WSW is ascribed to the gradient phase shift of the coiling-up-space units, which can be perfectly tuned by changing the coiling plate length and channel number inside the units. According to the generalized Snell＇s law, negative refraction and ＇driven＇ surface mode of WSW are also demonstrated at certain incidences. Specially, the transmitted WSW could be efficiently guided out by linking a symmetrically-corrugated channel in ＇driven＇ surface mode. This work may have potential applications in water wave energy extraction and coastal protection.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/10/104302