Reversal of transmission and reflection based on acoustic metagratings with integer parity design.,Nature Communications

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Reversal of transmission and reflection based on acoustic metagratings with integer parity design.
Nature Communications ( IF 14.7 ) Pub Date : 2019-05-24 , DOI: 10.1038/s41467-019-10377-9
Yangyang Fu _{1,

2} , Chen Shen ₃ , Yanyan Cao ₁ , Lei Gao ₁ , Huanyang Chen ₄ , C T Chan ₅ , Steven A Cummer ₃ , Yadong Xu ₁

Affiliation

Phase gradient metagratings (PGMs) have provided unprecedented opportunities for wavefront manipulation. However, this approach suffers from fundamental limits on conversion efficiency; in some cases, higher order diffraction caused by the periodicity can be observed distinctly, while the working mechanism still is not fully understood, especially in refractive-type metagratings. Here we show, analytically and experimentally, a refractive-type metagrating which can enable anomalous reflection and refraction with almost unity efficiency over a wide incident range. A simple physical picture is presented to reveal the underlying diffraction mechanism. Interestingly, it is found that the anomalous transmission and reflection through higher order diffraction can be completely reversed by changing the integer parity of the PGM design, and such phenomenon is very robust. Two refractive acoustic metagratings are designed and fabricated based on this principle and the experimental results verify the theory.

中文翻译：

基于具有整数奇偶校验设计的声迁移的传输和反射的反转。

相位梯度场（PGM）为波前操纵提供了前所未有的机会。但是，这种方法受到转换效率的根本限制。在某些情况下，可以清楚地观察到由周期性引起的高阶衍射，而对工作机理的理解还不十分清楚，尤其是在折射型光子晶体中。在这里，我们通过分析和实验显示了一种折射型转移光，它可以在宽入射范围内以几乎统一的效率实现异常反射和折射。提供了一个简单的物理图片以揭示潜在的衍射机理。有趣的是，发现通过更改PGM设计的整数奇偶性，可以完全逆转通过高阶衍射的异常透射和反射，而且这种现象非常强大。基于该原理设计并制造了两种折射声光栅，实验结果验证了该理论的正确性。

更新日期：2019-05-24

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