Terahertz electric field modulated mode coupling in graphene-metal hybrid metamaterials

Shaoxian Li, Priyo S. Nugraha, Xiaoqiang Su, Xieyu Chen, Quanlong Yang, Márta Unferdorben, Ferenc Kovács, Sándor Kunsági-Máté, Meng Liu, Xueqian Zhang, Chunmei Ouyang, Yanfeng Li, József A. Fülöp, Jiaguang Han, Weili Zhang

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8 Citations (Scopus)

Abstract

Taking advantage of the tunable conductivity of graphene under high terahertz (THz) electric field, a graphene-metal hybrid metamaterial consisting of an array of three adjoined orthogonally oriented split-ring resonators (SRRs) is proposed and experimentally demonstrated to show a maximum modulation depth of 23% in transmission when the THz peak field reaches 305 kV/cm. The transmission of the sample is dominated by the antisymmetric and symmetric resonant modes originating from the strong magneto-inductive and conductive coupling among the three SRRs, respectively. Numerical simulations and model calculations based on a coupled oscillator theory were performed to explain the modulation process. It is found that the graphene coating impairs the resonances by increasing the damping of the modes and decreasing the coupling between the SRRs whereas the strong THz field restores the resonances by decreasing the conductivity of graphene.

Original languageEnglish
Pages (from-to)2317-2326
Number of pages10
JournalOptics Express
Volume27
Issue number3
DOIs
Publication statusPublished - Feb 4 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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  • Cite this

    Li, S., Nugraha, P. S., Su, X., Chen, X., Yang, Q., Unferdorben, M., Kovács, F., Kunsági-Máté, S., Liu, M., Zhang, X., Ouyang, C., Li, Y., Fülöp, J. A., Han, J., & Zhang, W. (2019). Terahertz electric field modulated mode coupling in graphene-metal hybrid metamaterials. Optics Express, 27(3), 2317-2326. https://doi.org/10.1364/OE.27.002317