Mechanically stretchable and tunable metamaterial absorber
Mechanically stretchable and tunable metamaterial absorber
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DOI：
10.1063/1.4914502
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发表时间：
2015-03
影响因子：
4
通讯作者：
Fuli Zhang;Shuqi Feng;K. Qiu;Zijun Liu;Yuancheng Fan;Weihong Zhang;Qian Zhao;Ji Zhou
中科院分区：
文献类型：
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作者：
Fuli Zhang;Shuqi Feng;K. Qiu;Zijun Liu;Yuancheng Fan;Weihong Zhang;Qian Zhao;Ji Zhou
在这封信中，我们提出了一种机械可伸缩和可调谐的超材料吸波材料的实验演示，该吸波材料由堆叠在薄导电橡胶层上的介质谐振器组成。由于介质谐振器的磁米共振附近有很强的局域场限制，观察到了近单位吸收。此外，单元格之间的间距在单轴应力下是动态调节的。由于相邻晶胞之间的纵向耦合作用减弱，共振吸收峰在410 MHz处发生可逆调谐，应变沿H场方向变化达180%。相反，当外加应力沿电场方向施加时，由于横向相互作用较弱，共振吸收态几乎不受应变变化的影响。机械可调的超材料吸波材料具有灵活性，为实际应用铺平了道路。
In this letter, we present experimental demonstration of a mechanically stretchable and tunable metamaterial absorber composed of dielectric resonator stacked on a thin conductive rubber layer. A near unity absorption is observed due to strong local field confinement around magnetic Mie resonance of dielectric resonator. Furthermore, the interspacing between unit cells is modulated dynamically under uniaxial stress. Owing to the decreases of longitudinal coupling between neighboring unit cells, the resonant absorption peak is reversibly tuned by 410 MHz, as the stain varies up to 180% along H field direction. On the contrary, the resonant absorption state is nearly independent on strain variation when external stress is applied along E field direction, due to the weak transverse interplaying. The mechanically tunable metamaterial absorber featured by flexibility paves a way forwards for actual application.