• DOI:10.1063/1.4887364
• Corpus ID: 16601486

Extracting the complex optical conductivity of mono- and bilayer graphene by ellipsometry

@article{Chang2014ExtractingTC,
  title={Extracting the complex optical conductivity of mono- and bilayer graphene by ellipsometry},
  author={You-Chia Chang and Chang-Hua Liu and Che-Hung Liu and Zhaohui Zhong and Theodore B. Norris},
  journal={Applied Physics Letters},
  year={2014},
  volume={104},
  pages={261909}
}

• You-Chia Chang, Chang-Hua Liu, +2 authors T. Norris
• Published 3 July 2014
• Physics
• Applied Physics Letters

A method for analysis of spectroscopic ellipsometry data is demonstrated to extract the optical conductivity of mono- and bilayer chemical-vapor-deposited graphene. We model graphene as a truly two-dimensional (2D) material with a sheet conductivity, rather than a phenomenological effective refractive index as has been used in the literature. This technique measures both the real and imaginary part of the optical conductivity, which is important for graphene optoelectronics and metamaterials. Using this method, we obtain broadband measurements of the complex optical conductivity for mono- and bilayer graphene from ultraviolet to mid-infrared wavelengths. We also study how chemical doping with nitric acid modifies the complex optical conductivity.