Extraordinary transmission of gigahertz surface acoustic waves.

Extraordinary transmission of gigahertz surface acoustic waves.
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DOI:
10.1038/srep33380
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发表时间:
2016-09-19
期刊:
影响因子:
4.6
通讯作者:
Wright OB
Wright OB
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Mezil S;Chonan K;Otsuka PH;Tomoda M;Matsuda O;Lee SH;Wright OB

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波的超常透射,也就是说,比仅从孔径的几何考虑所预测的透射量更好的透射上级,迄今为止只在整体上进行过研究。在这里,我们提出了一个新的类的非凡的传输波限制在两个维度的平面。在千兆赫范围内(对应于声波波长λ ~ 3-50 μm),通过声学数值模拟,我们跟踪了平面表面声波阵面在两个硅块之间的传输,这两个硅块由一个具有或不具有附加腔的深亚波长可变长度的桥连接。该结构的几种共振模式,在本质上是一维和二维的,导致非常的声学传输,在这种情况下,传输效率,即强度增强,在两种相应的情况下高达~23和~8。我们展示了腔的形状和桥的尺寸如何影响非凡的传输效率。应用包括新的超材料和亚波长成像。
Extraordinary transmission of waves, i.e. a transmission superior to the amount predicted by geometrical considerations of the aperture alone, has to date only been studied in the bulk. Here we present a new class of extraordinary transmission for waves confined in two dimensions to a flat surface. By means of acoustic numerical simulations in the gigahertz range, corresponding to acoustic wavelengths λ ~ 3–50 μm, we track the transmission of plane surface acoustic wave fronts between two silicon blocks joined by a deeply subwavelength bridge of variable length with or without an attached cavity. Several resonant modes of the structure, both one- and two-dimensional in nature, lead to extraordinary acoustic transmission, in this case with transmission efficiencies, i.e. intensity enhancements, up to ~23 and ~8 in the two respective cases. We show how the cavity shape and bridge size influence the extraordinary transmission efficiency. Applications include new metamaterials and subwavelength imaging.
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