Terahertz imaging and spectroscopy of large-area single-layer graphene

Details Terahertz imaging and spectroscopy of large-area single-layer graphene Terahertz imaging and spectroscopy of large-area single-layer graphene

2011-01-07

arxiv.org/abs/1101.1338v2

Optics Express, Vol. 19, Issue 1, pp. 141-146 (2011

Physics

Condensed Matter

Materials Science

6 pages, 5 figures

Scientific paper

10.1364/OE.19.000141

We demonstrate terahertz (THz) imaging and spectroscopy of a 15x15-mm^2 single-layer graphene film on Si using broadband THz pulses. The THz images clearly map out the THz carrier dynamics of the graphene-on-Si sample, allowing us to measure sheet conductivity with sub-mm resolution without fabricating electrodes. The THz carrier dynamics are dominated by intraband transitions and the THz-induced electron motion is characterized by a flat spectral response. A theoretical analysis based on the Fresnel coefficients for a metallic thin film shows that the local sheet conductivity varies across the sample from {\sigma}s = 1.7x10^-3 to 2.4x10^-3 {\Omega}^-1 (sheet resistance, {\rho}s = 420 - 590 {\Omega}/sq).

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