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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Graphene Based Waveguide Polarizers: In-Depth Physical Analysis and Relevant Parameters

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Autor(es):
de Oliveira, Rafael E. P. [1] ; de Matos, Christiano J. S. [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, BR-01302907 Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: SCIENTIFIC REPORTS; v. 5, NOV 19 2015.
Citações Web of Science: 29
Resumo

Optical polarizing devices exploiting graphene embedded in waveguides have been demonstrated in the literature recently and both the TE-and TM-pass behaviors were reported. The determination of the passing polarization is usually attributed to graphene's Fermi level (and, therefore, doping level), with, however, no direct confirmation of this assumption provided. Here we show, through numerical simulation, that rather than graphene's Fermi level, the passing polarization is determined by waveguide parameters, such as the superstrate refractive index and the waveguide's height. The results provide a consistent explanation for experimental results reported in the literature. In addition, we show that with an accurate graphene modeling, a waveguide cannot be switched between TE pass and TM pass via Fermi level tuning. Therefore, the usually overlooked contribution of the waveguide design is shown to be essential for the development of optimized TE-or TM-pass polarizers, which we show to be due to the control it provides on the fraction of the electric field that is tangential to graphene. (AU)

Processo FAPESP: 15/11779-4 - Efeitos plasmônicos e não-lineares em grafeno acoplado a guias de onda ópticos
Beneficiário:Christiano José Santiago de Matos
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 12/50259-8 - Grafeno: fotônica e opto-eletrônica: colaboração UPM-NUS
Beneficiário:Antônio Hélio de Castro Neto
Linha de fomento: Auxílio à Pesquisa - Programa SPEC