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Saturday, August 6, 2016
Abstract-Graphene-based terahertz metasurface with tunable spectrum spli
Graphene-based terahertz metasurface with tunable spectrum splitting
Zhaoxian Su, Xuan Chen, Jianbo Yin, and Xiaopeng Zhao
We design a tunable terahertz metasurface, which consists of two different trapezoid graphene ribbons patterned in opposite directions on a gold film, separated by a thin dielectric spacer. The two kinds of graphene ribbons can cover a nearly 2𝜋 phase shift with high reflection efficiency in different spectral regions so that the metasurface can reflect different frequency waves to totally different directions. By changing the Fermi level of the graphene ribbons, the response frequency of the proposed metasurface can be adjusted, and as a result, tunable spectrum splitting can be realized. The present metasurface provides a powerful way to control terahertz waves and has potential applications in wide-angle beam splitters.