Extreme Frequency Conversion from Soliton Resonant Interactions
Extreme Frequency Conversion from Soliton Resonant Interactions
复制标题
孤子谐振相互作用的极端频率转换
DOI：
10.1103/physrevlett.126.073902
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发表时间：
2021
影响因子：
8.6
通讯作者：
Arrieta, Andres F.
中科院分区：
文献类型：
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作者：
Hwang, Myungwon;Arrieta, Andres F.
我们提出了一种具有双稳态微观结构的元结构架构，可实现极端宽带频率转换。我们使用数值和实验工具来揭示晶胞水平的输入激励与宏观结构水平的输出响应之间的关系。我们识别出孤子晶格模式共振，只要在元结构内触发过渡波，就会导致与输入无关的能量转移到所需的超束振动模式。我们观察到超波束中从低到高和从高到低的不相称频率相互作用，从而实现了相距 2 个数量级的频带之间的能量交换。这种行为概括了超导电子学中的磁通腔模式谐振，为力学中的极限频率转换提供了通用方法。重要的是，引入的架构通过从根本上打破宏观动力学对晶胞特性的依赖来扩展超材料设计范式。由此产生的与输入无关的性质意味着在宽带频率调节和能量转换方面的潜在应用。
We present a metastructure architecture with a bistable microstructure that enables extreme broadband frequency conversion. We use numerical and experimental tools to unveil the relationship between input excitations at the unit cell level and output responses at the macrostructural level. We identify soliton-lattice mode resonances resulting in input-independent energy transfer into desired metabeam vibration modes as long as transition waves are triggered within the metastructure. We observe both low-to-high and high-to-low incommensurate frequency interactions in the metabeams, thus enabling energy exchange between bands 2 orders of magnitude apart. This behavior generalizes fluxon-cavity mode resonance in superconducting electronics, providing a general method to extreme frequency conversion in mechanics. Importantly, the introduced architecture allows for expanding the metamaterials design paradigm by fundamentally breaking the dependence of macroscopic dynamics on the unit cell properties. The resulting input-independent nature implies potential applications in broadband frequency regulation and energy transduction.