Modulating the Near Field Coupling through Resonator Displacement in Planar Terahertz Metamaterials

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• 作者：S. Jagan Mohan Rao ; Deepak Kumar…
• 关键词：Metamaterials ; Terahertz ; Split ring resonators
• 刊名：Journal of Infrared, Millimeter, and Terahertz Waves
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：38
• 期：1
• 页码：124-134
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Electrical Engineering; Electronics and Microelectronics, Instrumentation; Classical Electrodynamics;
• 出版者：Springer US
• ISSN：1866-6906
• 卷排序：38

文摘

We present the effect of vertical displacements between the resonators inside the unit cell of planar coupled metamaterials on their near field coupling and hence on the terahertz (THz) wave modulation. The metamolecule design consists of two planar split- ring resonators (SRRs) in a unit cell which are coupled through their near fields. The numerically simulated transmission spectrum is found to have split resonances due to the resonance mode hybridization effect. With the increase in displacement between the near field coupled SRRs, this metamaterial system shows a transition from coupled to uncoupled state through merging of the split resonances to the single intrinsic resonance. We have used a semi-analytical model describing the effect of displacements between the resonators and determine that it can predict the numerically simulated results. The outcome could be useful in modulating the terahertz waves employing near field coupled metamaterials, hence, can be useful in the development of terahertz modulators and frequency tunable devices in future.