Enhanced optical dichroism of graphene nanoribbons

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Hipolito, F (Autor) Outra; Chaves, AJ (Autor) Outra; Ribeiro, RM (Autor) Outra; Vasilevskiy, MI (Autor) Outra; Pereira, VM (Autor) Outra; Peres, NMR (Autor) Outra

Revista

Título: Physical Review B - Condensed Matter and Materials Physics

Vol. 86

ISSN: 1098-0121

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 18 Citações

Scopus - 17 Citações

Outras Informações

ID Authenticus: P-002-5E5

DOI: 10.1103/physrevb.86.115430

Abstract (EN): 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9