Reliable and Tunable Elastic Interface States in Soft Metamaterials,Physica Status Solidi-Rapid Research Letters

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Reliable and Tunable Elastic Interface States in Soft Metamaterials
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-08-13 , DOI: 10.1002/pssr.202000338
Hao Niu ₁ , Shuaifeng Li _{1,

2} , Jianfeng Zang _{1,

3}

Affiliation

Tunable elastic interface states in soft materials have been successfully observed in experiments recently, which provides great application potentials in dynamic vibration energy‐harvesting devices or mechanical control of soft robotics. However, the generation of the proposed tunable elastic interfacial states relies on two differently deformed soft periodic phononic crystals, and complicated mechanical loadings and external installations are inevitable, which are indeed difficult to generate and manipulate. Herein, the dynamically adjustable elastic localized states are implemented in a more reliable and convenient way, which is readily modulated simply through compressing or stretching a mirror‐symmetric metamaterial composite simultaneously. The primitive cell of the soft periodic structures is inspired by the symmetry‐broken hexagonal boron nitride structure. Repeatable and reversible frequency shift and switch on–off characteristics of the interface states are observed during the dynamical regulation process, which is used in the dynamic elastic filter or divider devices. The feasibility of utilizing mirror operation to produce the interface states is clearly demonstrated, which effectively reduces the geometry and configuration design during the manufacturing process. The mirror method is also generalized to other periodic photonic and phononic crystals for the generation of additional multiple tunable interface states.

中文翻译：

软超材料中可靠且可调的弹性界面状态

最近在实验中已成功观察到软材料中的可调弹性界面状态，这在动态振动能量收集设备或软机器人的机械控制中提供了巨大的应用潜力。然而，所提出的可调弹性界面态的产生依赖于两个不同变形的软周期性声子晶体，并且不可避免的是复杂的机械载荷和外部装置，这确实很难产生和操纵。在这里，动态可调的弹性局部状态以更可靠，更方便的方式实现，只需通过同时压缩或拉伸镜面对称的超材料复合材料即可轻松进行调制。软周期结构的原始单元受到对称性破坏的六方氮化硼结构的启发。在动态调节过程中观察到界面状态的可重复和可逆的频移和开关特性，该特性用于动态弹性滤波器或分频器设备。清楚地证明了利用镜像操作来产生界面状态的可行性，这有效地减少了制造过程中的几何形状和配置设计。镜像方法也被推广到其他周期性的光子和声子晶体，以产生附加的多个可调界面状态。在动态调节过程中观察到界面状态的可重复和可逆的频移和开关导通特性，该特性在动态弹性滤波器或分频器设备中使用。清楚地证明了利用镜像操作来产生界面状态的可行性，这有效地减少了制造过程中的几何形状和配置设计。镜像方法也被推广到其他周期性的光子和声子晶体中，以产生附加的多个可调界面状态。在动态调节过程中观察到界面状态的可重复和可逆的频移和开关导通特性，该特性在动态弹性滤波器或分频器设备中使用。清楚地证明了利用镜像操作来产生界面状态的可行性，这有效地减少了制造过程中的几何形状和配置设计。镜像方法也被推广到其他周期性的光子和声子晶体中，以产生附加的多个可调界面状态。

更新日期：2020-10-02

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