Realization of mid-infrared graphene hyperbolic metamaterials

You-Chia Chang, Che-Hung Liu, Chang-Hua Liu, Siyuan Zhang, Seth R. Marder, Evgenii E. Narimanov, Zhaohui Zhong and Theodore B. Norris ()
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You-Chia Chang: Center for Photonics and Multiscale Nanomaterials, University of Michigan
Che-Hung Liu: Center for Photonics and Multiscale Nanomaterials, University of Michigan
Chang-Hua Liu: University of Michigan
Siyuan Zhang: School of Chemistry and Biochemistry, Georgia Institute of Technology
Seth R. Marder: School of Chemistry and Biochemistry, Georgia Institute of Technology
Evgenii E. Narimanov: School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University
Zhaohui Zhong: Center for Photonics and Multiscale Nanomaterials, University of Michigan
Theodore B. Norris: Center for Photonics and Multiscale Nanomaterials, University of Michigan

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract While metal is the most common conducting constituent element in the fabrication of metamaterials, graphene provides another useful building block, that is, a truly two-dimensional conducting sheet whose conductivity can be controlled by doping. Here we report the experimental realization of a multilayer structure of alternating graphene and Al2O3 layers, a structure similar to the metal-dielectric multilayers commonly used in creating visible wavelength hyperbolic metamaterials. Chemical vapour deposited graphene rather than exfoliated or epitaxial graphene is used, because layer transfer methods are easily applied in fabrication. We employ a method of doping to increase the layer conductivity, and our analysis shows that the doped chemical vapour deposited graphene has good optical properties in the mid-infrared range. We therefore design the metamaterial for mid-infrared operation; our characterization with an infrared ellipsometer demonstrates that the metamaterial experiences an optical topological transition from elliptic to hyperbolic dispersion at a wavelength of 4.5 μm.

Date: 2016
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DOI: 10.1038/ncomms10568

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