Measurement of the optical absorption spectra of epitaxial graphene from terahertz to visible
By J. Dawlaty, S. Shivaraman, J. Strait, P. George, M. Chandrashekhar, Farhan Rana, M. Spencer, D. Veksler, Yunqing Chen. 2008
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We present experimental results on the optical absorption spectra of epitaxial graphene from the visible to the terahertz frequency range. In the terahertz range, the absorption is dominated by intraband processes with a frequency dependence similar to the Drude model. In the near-IR range, the absorption is due to interband processes and the measured optical conductivity is close to the theoretical value of e2/4ℏ. We extract values for the carrier densities, the number of carbon atom layers, and the intraband scattering times from the measurements.
Subfields: Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/b0c9547b1896dedd6a7acdfc1c4c8e0a0b702b00
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In Materials Chemistry
Citations in the corpus
- Ultra-compact integrated graphene plasmonic photodetector with bandwidth above 110 GHz (2018, background): “The distinct properties of graphene in terms of ultrahigh carrier mobility [19, 20], zero bandgap property that enables wavelengthindependent light absorption over a very wide spectral range [21, 22, 23], and tunable optoelectronic properties [24, 25] give rise to realize the graphene photodetectors”
- Dirac electronic states in graphene systems: optical spectroscopy studies (2010, background): “ing Fermi level gives rise to the characteristic onset of optical conductivity at 2E F. Intra-band transitions results in the appearance of the Drude-peak centered at zero frequency. on SiC substrate [62] in a wide range of photon energies. Nevertheless, we should mention that the declared universal”
- Atomically thin surface cloak using graphene monolayers. (2011, background): “From eqs 1 3, it is found that, in the THz and farinfrared region, the intraband contribution (eq 2) dominates.(29,34) The unique features of ballistic transport and ultrahigh electron mobility (in excess of 20 000 cm(2) V 1 s (1))(23) may provide an almost purely imaginary conductivity of graphene ”