Terahertz transmission and sheet conductivity of randomly stacked multi-layer graphene

Baek, I. H.; Ahn, K. J.; Kang, B. J.; Bae, S.; Hong, B. H.; Yeom, D.-I.; Lee, K.; Jeong, Y. U.; Rotermund, F.
May 2013
Applied Physics Letters;5/13/2013, Vol. 102 Issue 19, p191109
Academic Journal
We investigate transmission characteristics and sheet conductivity of mono- to multi-layer graphene deposited on quartz in the terahertz (THz) frequency region. The free carrier absorption and Fabry-Perot interference between graphene layers give rise to nonlinear decrease of THz transmission from 76.7% to 27% for mono- to 12-layer graphene. These phenomena are well explained with a modified theoretical model based on Drude conductivity. The optical sheet conductivity of multi-layer graphene, made by layer-by-layer random stacking of high-quality mono-layer graphene, at 1 THz exhibits two orders of magnitude higher values than the universal optical conductivity due to intraband transition of intrinsic graphene.


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