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Controlling graphene plasmons with zero-index metasurface


Graphene plasmons, owing to its diverse applications including electro-optical modulation, optical sensing, spectral photometry and tunable lighting at the nanoscale, has recently attracted much attention. One key challenge for advancing this field is to precisely control the propagation of graphene plasmons. Here, we propose an on-chip integrated platform to engineer the wave front of the graphene plasmons through a metasurface with a refractive index of zero. We demonstrate that a well-designed graphene/photonic-crystal metasurface can possess conical plasmonic dispersion at the Brillouin zone center with a triply degenerate state at the Dirac frequency, giving rise to the zero-effective-index of graphene plasmons. Plane-wave-emission and focusing effects of graphene plasmons are achieved by tailoring such a zero-index metasurface. In addition to the tunable Dirac point frequency enabled by the electrical tuning of graphene Fermi level, our highly integrated system also provides stable performance even when defects are contained. This actively controllable on-chip platform can potentially be useful for integrated photonic circuits and devices.

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Publication details

The article was received on 28 Jul 2017, accepted on 30 Oct 2017 and first published on 31 Oct 2017

Article type: Paper
DOI: 10.1039/C7NR05555B
Citation: Nanoscale, 2017, Accepted Manuscript
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    Controlling graphene plasmons with zero-index metasurface

    L. Lin, Y. Lu, M. Yuan, F. Shi, H. Xu and Y. Chen, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05555B

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