期刊
ACS NANO
卷 10, 期 5, 页码 5499-5506出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b01944
关键词
graphene; surface plasmons; metamaterials; tunable metasurfaces; isotropic metasurfaces; terahertz; effective surface conductivity; transformation optics
类别
资金
- Leverhulme Trust
- EPSRC [EP/L024926/1]
- Gordon and Betty Moore Foundation
- Engineering and Physical Sciences Research Council [EP/L024926/1] Funding Source: researchfish
- EPSRC [EP/L024926/1] Funding Source: UKRI
We demonstrate a tunable plasmonic meta surface by considering a graphene sheet subject to a periodically patterned doping level. The unique optical properties of graphene result in electrically tunable plasmons that allow for extreme confinement of electromagnetic energy in the technologically significant regime of THz frequencies. Here, we add an extra degree of freedom by using graphene as a metasurface, proposing to dope it with an electrical gate patterned in the micron or submicron scale. By extracting the effective conductivity of the sheet, we characterize metasurfaces periodically modulated along one or two directions. In the first case, and making use of the analytical insight provided by transformation optics, we show an efficient control of THz radiation for one polarization. In the second case, we demonstrate a metasurface with an isotropic response that is independent of wave polarization and orientation.
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