期刊
OPTICS COMMUNICATIONS
卷 402, 期 -, 页码 523-526出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2017.06.044
关键词
Terahertz wavefront; Graphene; Metasurface; Phase shift
类别
资金
- Tianjin Applied Foundation and Advanced Technology Research Program (Youth Program) [14JCQNJC00900]
- Youth Science Foundation Project of National Natural Science Foundation of China [61505144]
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 pi 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. (C) 2017 Elsevier B.V. All rights reserved.
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