Terahertz imaging and spectroscopy of large-area single-layer graphene
| Autor: | Tomaino, J. L., Jameson, A. D., Kevek, J. W., Paul, M. J., van der Zande, A. M., Barton, R. A., McEuen, P. L., Minot, E. D., Lee, Yun-Shik |
|---|---|
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Optics Express, Vol. 19, Issue 1, pp. 141-146 (2011 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1364/OE.19.000141 |
| Popis: | 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). Comment: 6 pages, 5 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|