Hybrid magnetoacoustic metamaterials for ultrasound control
Hybrid magnetoacoustic metamaterials for ultrasound control
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DOI：
10.1063/5.0018801
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发表时间：
2019-11
影响因子：
4
通讯作者：
O. S. Latcham;Y. Gusieva;A. Shytov;O. Gorobets;V. Kruglyak
中科院分区：
文献类型：
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作者：
O. S. Latcham;Y. Gusieva;A. Shytov;O. Gorobets;V. Kruglyak
我们提出了一类超材料，它通过磁弹性耦合来控制声波的传播。超材料是由嵌入非磁性基质中的薄磁层(谐振器)的周期性阵列形成的。携带能量通过结构的声波与谐振器的磁模混合(Fano共振)。这导致了一系列丰富的效应，布拉格散射增强了这些效应，当磁共振频率接近或位于声学带隙内时，这种效应最为明显。该结构的声反射表现为磁感应透明和Borrmann效应。我们的分析表明，Bragg散射和Fano共振的综合效应可以克服现实系统中普遍存在的磁阻尼。这为这种结构在波浪计算和信号处理中的应用铺平了道路
We propose a class of metamaterials in which propagation of acoustic waves is controlled magnetically through magnetoelastic coupling. The metamaterials are formed by a periodic array of thin magnetic layers ('resonators') embedded in a non-magnetic matrix. Acoustic waves carrying energy through the structure hybridize with the magnetic modes of the resonators ('Fano resonance'). This leads to a rich set of effects, enhanced by Bragg scattering and being most pronounced when the magnetic resonance frequency is close to or lies within acoustic band gaps. The acoustic reflection from the structure exhibits magnetically induced transparency and Borrmann effect. Our analysis shows that the combined effect of the Bragg scattering and Fano resonance may overcome the magnetic damping ubiquitous in realistic systems. This paves a route towards application of such structures in wave computing and signal processing