1Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, USA
2Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
3Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84112, USA
4Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
2Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
3Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84112, USA
4Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
We demonstrate that highly oriented pyrolytic graphite is a potentially useful material for plasmonic applications in the terahertz (THz) spectral range. Using THz time-domain spectroscopy, we studied the transmission properties of a ∼7.5 μm thick graphite film made via mechanical exfoliation and found that the complex dielectric constant follows the Drude model with a plasma frequency νp ∼ 34 THz. To assess the graphite plasmonic properties, we fabricated a subwavelength periodic aperture array in the graphite film and in a free-standing stainless steel film. Despite the low conductivity of graphite compared to conventional metals, the resonant transmission properties are similar.
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