Enhanced optical dichroism of graphene nanoribbons

Article

关键词: CARBON NANOTUBES;    TRANSPORT;    SPECTROSCOPY;    EDGE;   

DOI  :  10.1103/PhysRevB.86.115430

来源: SCIE

【 摘 要 】

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 similar 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.

【 授权许可】

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