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31 January 2014 THz near-field microscopy of graphene structures
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Properties of graphene can be tuned electrically and chemically, providing a promising system for application in terahertz (THz) devices. Graphene response can be enhanced even further by means of coupling electromagnetic waves into plasmon modes, frequency of which is controlled by geometrical parameters. To probe excitation of confined plasmon modes and surface wave excitation, epitaxial graphene and its structures are investigated using THz near-field microscopy. Detected near-field images suggest excitation of THz surface waves occurring at graphene edges, similar to that observed at metallic edges, and excitation of confined plasmon modes. We will also discuss the impact of graphene inhomogeneity on local THz transmission properties on the sub-wavelength scale.
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Oleg Mitrofanov, Wenlong Yu, Robert J. Thompson, Yuxuan Jiang, Igal Brener, Wei Pan, Claire Berger, Walter A. de Heer, and Zhigang Jiang "THz near-field microscopy of graphene structures", Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 89932A (31 January 2014);

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