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

Abstract

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 σs = 1.7x10^-3 to 2.4x10^-3 Ω^-1 (sheet resistance, ρs = 420 - 590 Ω/sq).

arXiv comment6 pages, 5 figures

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• Broadband microwave and time-domain terahertz spectroscopy of CVD grown graphene
• High field response of gated graphene at THz frequencies
• Broadband Terahertz Modulation in Electrostatically-doped Artificial Trilayer Graphene