弯曲源的负折射和波沟道的预应力调谐
Prestress tuning of negative refraction and wave channeling from flexural sources
摘要：
对波通道和操纵的追求推动了对能够传播局部电磁或机械信号的拓扑和结构材料的强大研究。参考弹性结构网格，其中元素可以承受轴向和弯曲变形，它示出的材料接口可以创建与预应力状态调谐的结构特性，以实现全反射，负折射，和强烈的本地化信号通道。平面透镜和拓扑局部模式的实现被证明和系统的可调谐性允许这些属性，以保持广泛的波长范围。获得这些效果的一个要素是使用集中的脉动时刻，这里建议，以前从未尝试过。所提出的方法的一个重要方面是，预应力状态可以很容易地被删除或改变，以调整与连续性的传播特性的介质，使一个新的使用振动通道和操纵设想弹性材料。
英文摘要：
The quest for wave channeling and manipulation has driven a strong research effort on topological and architected materials, capable of propagating localized electromagnetical or mechanical signals. With reference to an elastic structural grid, which elements can sustain both axial and flexural deformations, it is shown that material interfaces can be created with structural properties tuned by prestress states to achieve total reflection, negative refraction, and strongly localized signal channeling. The achievement of a flat lens and topologically localized modes is demonstrated and tunability of the system allows these properties to hold for a broad range of wavelengths. An ingredient to obtain these effects is the use, suggested here and never attempted before, of concentrated pulsating moments. The important aspect of the proposed method is that states of prestress can be easily removed or changed to tune with continuity the propagational characteristics of the medium, so that a new use of vibration channeling and manipulation is envisaged for elastic materials.
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