Wavefront modulation of water surface wave by a metasurface  

作　　者：孙海涛 程营 王敬时 刘晓峻 

机构地区：[1]Department of Physics,Nanjing University [2]School of Electronics and Information,Nantong University

出　　处：《Chinese Physics B》2015年第10期292-296,共5页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant No.2012CB921504);the National Natural Science Foundation of China(Grant Nos.11474162,11274171,11274099,and 11204145);the Specialized Research Fund for the Doctoral Program of Higher Education,China(Grant Nos.20110091120040 and 20120091110001)

摘　　要：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.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.

关 键 词：metasurface water surface wave negative refraction coiling up space 

分 类 号：O427[理学—声学]