期刊
OPTICS COMMUNICATIONS
卷 380, 期 -, 页码 101-107出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2016.05.075
关键词
Terahertz metamaterial; Absorber; Polarization sensitive; Graphene; Dynamically tunable
类别
资金
- Fundamental Research Funds for the Central Universities of China [JZ2015HGBZ0109]
A tunable metamaterial absorber composed of a metal ground plane, a SiO2 dielectric spacer, a graphene layer and a metal pattern layer, which is polarization sensitive is numerically proposed at terahertz (THz) frequencies. Our calculated results show that when the Fermi level of graphene is fixed at 0.7 eV, the absorptivities for x-polarized wave are about 0.985 at 6.42 THz, and 0.991 at 8.37 THz, respectively, while the absorptivity for y-polarized wave is about 0.99 at 7.22 THz. Moreover, the calculated electric field and surface current distributions, along with power loss distributions enable us to deeply understand the physical mechanism of resonance absorption. More importantly, absorption spectra at different Fermi levels of graphene and different incident angles are displayed and tuning functions are discussed in detail. This work may provide a further step in the development of potential applications based on metamaterial absorber, such as THz polarization imaging, THz sensing and polarization multiplexing. (C) 2016 Elsevier B.V. All rights reserved.
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