Terahertz wavefront manipulating by double-layer graphene ribbons metasurface

Terahertz wavefront manipulating by double-layer graphene ribbons metasurface
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双层石墨烯带超表面操控太赫兹波前

DOI:
10.1016/j.optcom.2017.06.044
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发表时间:
2017-11
影响因子:
2.4
通讯作者:
Yao Jianquan
Yao Jianquan
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhao Honghang;Chen Zhihong;Su Fei;Ren Guangjun;Liu Fei;Yao Jianquan

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最近提出的位相梯度亚表面可以聚焦太赫兹范围内的反射。然而,窄带宽和复杂的调谐方法仍然是挑战。例如,一旦设备建成,尺寸就很难改变。我们提出了一种可调谐的双层石墨烯薄带阵列(DLGRA)亚表面,在太赫兹波前控制方面具有很大的应用潜力。通过改变每个石墨烯带的费米能级,用键合剂和薄介质间隔层隔开的DLGRA可以获得近2π的相移和高的反射效率。DLGRA数值模拟结果表明,该反射器可以在较宽的频率范围内聚焦太赫兹波。有趣的是,通过附近的石墨烯带之间的横向移动,耦合的变化导致了聚焦频率的移动。因此,这种方法将频率范围增加到比固定状态更高的程度。提出的亚表面为在较宽的频率范围内操纵太赫兹波提供了一种有效的方法。
It was recently presented that the phase gradient metasurface can focus the reflection in terahertz range. However, narrow bandwidth and complex tuning method are still challenges. For instance, the size is difficult to be changed once the device is built. We propose a tunable double-layer graphene ribbons array (DLGRA) metasurface which has great potentials for applications in terahertz wavefront control. By changing the Fermi level of each graphene ribbon independently, the DLGRA separated by a bonding agent and a thin dielectric spacer can achieve nearly 2 π phase shift with high reflection efficiency. A reflector which can focus terahertz waves over a broad frequency range is demonstrated numerically by the DLGRA. Intriguingly, through a lateral shift between the nearby graphene ribbons, the variation of coupling induces a shift of focusing frequency. Hence, this approach increases the frequency range to a higher degree than the fixed state. The proposed metasurface provides an effective way for manipulating terahertz waves in a broad frequency range.
DOI: 10.3390/s90604559
发表时间: 2009
期刊: Sensors (Basel, Switzerland)
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