Active control of near-field coupling in conductively coupled microelectromechanical system metamaterial devices
Active control of near-field coupling in conductively coupled microelectromechanical system metamaterial devices
复制标题
传导耦合微机电系统超材料器件中近场耦合的主动控制
DOI：
10.1063/1.4943974
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发表时间：
2016-03-14
影响因子：
4
通讯作者：
Lee, Chengkuo
中科院分区：
文献类型：
--
作者：
Pitchappa, Prakash;Manjappa, Manukumara;Lee, Chengkuo
我们实验报告了一种结构可重构的超材料，用于在太赫兹光谱区工作的导电耦合正交扭转开口环谐振器（SRR）中的近场耦合的主动切换。集成到暗SRR几何结构中的面外可重构微悬臂梁用于提供暗SRR谐振的主动频率调谐。各个SRR的几何参数被设计为具有相同的电感电容谐振频率。这允许由于SRR之间的强传导耦合而激发电磁感应透明（EIT）的经典模拟。当微悬臂梁向上弯曲时，暗SRR的谐振频率蓝移，EIT峰被完全调制，而SRR仍然导电连接。实验结果表明，在群延迟为2.5ps的情况下，EIT的调制对比度可达50%以上.所提出的结构可重构超材料的电气控制、小型化尺寸和易于集成的制造工艺使其成为实现各种太赫兹通信设备的理想候选者，例如电气可控的太赫兹延迟线、缓冲器和可调谐数据速率信道。
We experimentally report a structurally reconfigurable metamaterial for active switching of near-field coupling in conductively coupled, orthogonally twisted split ring resonators (SRRs) operating in the terahertz spectral region. Out-of-plane reconfigurable microcantilevers integrated into the dark SRR geometry are used to provide active frequency tuning of dark SRR resonance. The geometrical parameters of individual SRRs are designed to have identical inductive-capacitive resonant frequency. This allows for the excitation of classical analogue of electromagnetically induced transparency (EIT) due to the strong conductive coupling between the SRRs. When the microcantilevers are curved up, the resonant frequency of dark SRR blue-shifts and the EIT peak is completely modulated while the SRRs are still conductively connected. EIT modulation contrast of ∼50% is experimentally achieved with actively switchable group delay of ∼2.5 ps. Electrical control, miniaturized size, and readily integrable fabrication process of the proposed structurally reconfigurable metamaterial make it an ideal candidate for the realization of various terahertz communication devices such as electrically controllable terahertz delay lines, buffers, and tunable data-rate channels.