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

You-Chia Chang, Chang Hua Liu, Che Hung Liu, Zhaohui Zhong, Theodore B. Norris

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Abstract

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.

Original languageEnglish
Article number261909
JournalApplied Physics Letters
Volume104
Issue number26
DOIs
StatePublished - 1 Jan 2014

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