All-angle Negative Reflection with An Ultrathin Acoustic Gradient Metasurface: Floquet-Bloch Modes Perspective and Experimental Verification
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影响因子：4.997
DOI码：10.1038/s41598-017-14387-9
发表刊物：Scientific Reports
摘要：Metasurface with gradient phase response offers new alternative for steering the propagation of waves. Conventional Snell's law has been revised by taking the contribution of local phase gradient into account. However, the requirement of momentum matching along the metasurface sets its nontrivial beam manipulation functionality within a limited-angle incidence. In this work, we theoretically and experimentally demonstrate that the acoustic gradient metasurface supports the negative reflection for all-angle incidence. The mode expansion theory is developed to help understand how the gradient metasurface tailors the incident beams, and the all-angle negative reflection occurs when the first negative order Floquet-Bloch mode dominates inside the metasurface slab. The coiling-up space structures are utilized to build desired acoustic gradient metasurface, and the all-angle negative reflections have been perfectly verified by experimental measurements. Our work offers the Floquet-Bloch modes perspective for qualitatively understanding the reflection behaviors of the acoustic gradient metasurface, and the all-angle negative reflection characteristic possessed by acoustic gradient metasurface could enable a new degree of the acoustic wave manipulating and be applied in the functional diffractive acoustic elements, such as the all-angle acoustic back reflector.
合写作者：Jiajun Zhao,Xiaodong Xu,Wenyu Zhao
第一作者：Bingyi Liu
论文类型：期刊论文
通讯作者：Yongyuan Jiang
论文编号：000413401300027
学科门类：理学
文献类型：J
卷号：7
期号：1
字数：3500
ISSN号：ISSN 2045-2322
是否译文：否
发表时间：2017-10-23
收录刊物：SCI