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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Dynamically tunable electromagnetically induced transparency analogy in terahertz metamaterial
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Dynamically tunable electromagnetically induced transparency analogy in terahertz metamaterial

机译：Terahertz超材料动态可调谐电磁诱导的透明度类比

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摘要

A metamaterial analogy of tunable electromagnetically induced transparency (EIT) is theoretically investigated in terahertz regime. The proposed metamaterial consists of vertical gold strips and horizontal graphene wires, which perform as bright elements and dark elements, respectively. The EIT-like phenomenon can be induced by bright-dark mode coupling on condition of structural lateral displacement. Numerical result reveals that the EIT-like effect remains noticeable with a wide range of incidence polarization angles. Most importantly, by manipulating gate voltages, the EIT window can be dynamically controlled without refabricating the structure. The amplitude modulation depth can reach 81%, 79%, and 68% respectively at three characteristic frequencies as Fermi energy changes in the scope of 0.8-1.0 eV. Furthermore, a sensitivity of 0.95 THz per refractive index unit (RIU) is realized varying the refractive index in the surrounding medium. This structure provides potential applications for detectors, sensors, and modulators. (C) 2017 Elsevier B.V. All rights reserved.
机译：理论上在太赫兹政权中研究了可调谐电磁诱导透明度（EIT）的超材料类比。所提出的超材料包括垂直金条和水平石墨烯线，分别作为亮的元件和黑暗元件。在结构横向位移的条件下，可以通过明亮暗模式耦合诱导的EIT样现象。数值结果表明，EIT样效果仍然明显，具有宽范围的发射偏振角。最重要的是，通过操纵栅极电压，可以动态地控制EIT窗口而无需重新制衡结构。由于Fermi能量变化为0.8-1.0eV的范围，幅度调制深度可分别达到81％，79％和68％，因为Fermi能量变化。此外，实现每折射率单元（RIU）0.95 THz的灵敏度，实现周围介质中的折射率。该结构为探测器，传感器和调制器提供了潜在的应用。 （c）2017年Elsevier B.V.保留所有权利。

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