Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/21324

TitleEnhanced optical dichroism of graphene nanoribbons
Author(s)Hipolito, Fábio
Chaves, A. J.
Ribeiro, R. M.
Vasilevskiy, Mikhail
Pereira, Vitor M.
Peres, N. M. R.
KeywordsGraphene
Nanoribbon
Optical conductivity
Dichroism
Issue date19-Sep-2012
PublisherAmerican Physical Society
JournalPhysical Review B: Condensed Matter and Materials Physics
CitationPhysical Review B: Condensed Matter and Materials Physics, 86 (2012) 115430
Abstract(s)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.
TypeArticle
URIhttp://hdl.handle.net/1822/21324
DOI10.1103/PhysRevB.86.115430
ISSN1098-0121
e-ISSN1550-235X
Publisher versionhttp://prb.aps.org/
Peer-Reviewedyes
AccessOpen access
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)

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