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|Title:||Enhanced optical dichroism of graphene nanoribbons|
|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. https://doi.org/10.1103/PhysRevB.86.115430|
|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|
|Appears in Collections:||Staff Publications|
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