Epitaxial graphene mesas and ribbons are investigated using terahertz (THz) nearfield microscopy to probe surface plasmon excitation and THz transmission properties on the sub-wavelength scale. The THz near-field images show variation of graphene properties on a scale smaller than the wavelength, and excitation of THz surface waves occurring at graphene edges, similar to that observed at metallic edges. The Fresnel reflection at the substrate SiC/air interface is also found to be altered by the presence of graphene ribbon arrays, leading to either reduced or enhanced transmission of the THz wave depending on the wave polarization and the ribbon width.
@article{arxiv.1307.7374,
title = {Probing terahertz surface plasmon waves in graphene structures},
author = {Oleg Mitrofanov and Wenlong Yu and Robert J. Thompson and Yuxuan Jiang and Igal Brener and Wei Pan and Claire Berger and Walter A. de Heer and Zhigang Jiang},
journal= {arXiv preprint arXiv:1307.7374},
year = {2015}
}
Comments
accepted for publication in Applied Physics Letter