Wavefront modulation of water surface wave by a metasurface

• 作者: 刘晓峻 孙海涛 王敬时 程营
• 来源期刊: 中国物理B（英文版）
• 关键词: metasurface water surface wave negative refraction coiling up space
• 年，卷（期）: 2015,（10）
• 页码范围: 104302-1-104302-5
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/10/104302

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.