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Title: Enhanced optical dichroism of graphene nanoribbons
Authors: Hipolito, F.
Chaves, A.J.
Ribeiro, R.M.
Vasilevskiy, M.I.
Pereira, V.M. 
Peres, N.M.R.
Issue Date: 19-Sep-2012
Citation: Hipolito, F., Chaves, A.J., Ribeiro, R.M., Vasilevskiy, M.I., Pereira, V.M., Peres, N.M.R. (2012-09-19). Enhanced optical dichroism of graphene nanoribbons. Physical Review B - Condensed Matter and Materials Physics 86 (11) : -. ScholarBank@NUS Repository.
Abstract: The optical conductivity of graphene nanoribbons is analytical and exactly derived. It is shown that the absence of translational invariance along the transverse direction allows considerable intraband absorption in a narrow frequency window that varies with the ribbon width, and lies in the THz range domain for ribbons 10-100 nm wide. In this spectral region the absorption anisotropy can be as high as two orders of magnitude, which renders the medium strongly dichroic, and allows for a very high degree of polarization (up to ∼85%) with just a single layer of graphene. Using a cavity for impedance enhancement, or a stack of few layer nanoribbons, these values can reach almost 100%. This opens a potential prospect of employing graphene ribbon structures as efficient polarizers in the far IR and THz frequencies. © 2012 American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 10980121
DOI: 10.1103/PhysRevB.86.115430
Appears in Collections:Staff Publications

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