Experimental Realization of Full Control of Reflected Waves with Subwavelength Acoustic Metasurfaces
Experimental Realization of Full Control of Reflected Waves with Subwavelength Acoustic Metasurfaces
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亚波长声学超表面完全控制反射波的实验实现
DOI：
10.1103/physrevapplied.2.064002
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发表时间：
2014-12-03
影响因子：
4.6
通讯作者：
Cheng, Jian-chun
中科院分区：
文献类型：
--
作者：
Li, Yong;Jiang, Xue;Cheng, Jian-chun
具有亚波长厚度的超颖表面以传统材料无法模仿的方式表现出非常规现象。在这里，我们报告的分析设计和实验实现的声学超表面迄今无法访问的功能任意操纵反射波。通过适当地设计具有由正弦单元引起的2 π跨度的相移轮廓，超表面可以以不寻常但可控的方式反射声波。异常反射和非均匀平面透镜都证明了精心设计的超颖表面。值得注意的是，相移的自由操作提供了很大的灵活性，在非傍轴声自加速光束的设计与任意轨迹。凭借非凡的波转向能力，超表面应该为设计具有多功能潜力的紧凑声学组件打开令人兴奋的可能性，并且可以找到从超声成像到焦散工程的各种应用，其中需要设计声音的聚焦轨迹的形状。
Metasurfaces with subwavelength thicknesses have exhibited unconventional phenomena in ways that could not be mimicked by traditional materials. Here we report on the analytical design and experimental realizations of acoustic metasurfaces with hitherto inaccessible functionality of manipulating the reflected waves arbitrarily. By suitably designing the phase-shift profile with a 2 pi span induced by labyrinthine units, the metasurface can reflect acoustic waves in an unusual yet controllable manner. Anomalous reflection and ultrathin planar lenses are both demonstrated with carefully designed metasurfaces. Remarkably, the free manipulation of phase shifts offers great flexibility in the design of nonparaxial acoustic self-accelerating beams with arbitrary trajectories. With extraordinary wave-steering ability, the metasurface should open exciting possibilities for designing compact acoustic components with versatile potential and may find a variety of applications ranging from ultrasound imaging to caustic engineering where designing the shape of a focused trajectory of sound is required.