期刊
NANO LETTERS
卷 13, 期 3, 页码 1111-1117出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl304476b
关键词
Graphene; Fano resonances; optical modulation; plasmonic metamaterials; mid-infrared
类别
资金
- Office of Naval Research [N00014-10-1-0929, N00014-10-1-0254]
- National Science Foundation [PHY 0851614]
- Tokyo Electron Ltd (TEL)-customized Semiconductor Research Corporation award [2009-OJ-1873]
Graphene is widely known for its anomalously strong broadband optical absorptivity of 2.3% that enables seeing its single-atom layer with the naked eye. However, in the mid-infrared part of the spectrum graphene represents a quintessential lossless zero-volume plasmonic material. We experimentally demonstrate that, when integrated with Fano-resonant plasmonic metasurfaces, single-layer graphene (SLG) can be used to tune their mid-infrared optical response. SLG's plasmonic response is shown to induce large blue shifts of the metasurface's resonance without reducing its spectral sharpness. This effect is explained by a generalized perturbation theory of SLG-metamaterial interaction that accounts for two unique properties of the SLG that set it apart from all other plasmonic materials: its anisotropic response and zero volume. These results pave the way to using gated SLG as a platform for dynamical spectral tuning of infrared metamaterials and metasurfaces.
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