Origin of strain-induced resonances in flexible terahertz metamaterials
Origin of strain-induced resonances in flexible terahertz metamaterials
复制标题
柔性太赫兹超材料中应变引起的共振的起源
DOI：
10.1088/1674-1056/25/5/057802
复制
发表时间：
2016-04
影响因子：
1.7
通讯作者：
Song Wei-Jie
中科院分区：
文献类型：
--
作者：
Sun Xiu-Yun;Zheng Li-Ren;Li Xiao-Ning;Xu Hua;Liang Xian-Ting;Zhang Xian-Peng;Lu Yue-Hui;Lee Young-Pak;Rhee Joo-Yull;Song Wei-Jie
在聚萘二甲酸乙二醇酯（PEN）衬底上制备了两种柔性太赫兹超材料。一种类型的单位单元由面对面布置的两个相同的开口环谐振器（SRR）组成（即，FlexMetaF）;另一种类型的单位单元没有什么不同，但是背靠背布置（即，FlexMetaB）。FlexMetaF和FlexMetaB示出了在零应变下的类似的透射下降，因为基本电感-电容（LC）谐振的激发主要取决于单个SRR的几何结构。然而，如果向弯曲FlexMetaF和FlexMetaB施加逐渐变化的应变，则出现新的谐振峰：在FlexMetaF的情况下，峰位于较低的频率处;在FlexMetaB的情况下，峰出现在与LC谐振相邻的频率处。研究了应变诱导共振的起源和演化。其起源归因于失谐效应，FlexMetaF和FlexMetaB对应变的不同响应与耦合效应有关。这些发现有助于提高人们对柔性太赫兹超材料的理解，并有助于其在柔性或弯曲器件中的应用。
Two types of flexible terahertz metamaterials were fabricated on polyethylene naphthalate (PEN) substrates. The unit cell of one type consists of two identical split-ring resonators (SRRs) that are arranged face-to-face (i.e., FlexMetaF); the unit cell of the other type has nothing different but is arranged back-to-back (i.e., FlexMetaB). FlexMetaF and FlexMetaB illustrate the similar transmission dips under zero strain because the excitation of fundamental inductive–capacitive (LC) resonance is mainly dependent on the geometric structure of individual SRR. However, if a gradually variant strain is applied to bend FlexMetaF and FlexMetaB, the new resonant peaks appear: in the case of FlexMetaF, the peaks are located at the lower frequencies; in the case of FlexMetaB, the peaks appear at the frequencies adjacent to the LC resonance. The origin and evolution of strain-induced resonances are studied. The origin is ascribed to the detuning effect and the different responses to strain from FlexMetaF and FlexMetaB are associated with the coupling effect. These findings may improve the understanding on flexible terahertz metamaterials and benefit their applications in flexible or curved devices.
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