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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.)

Scattering of graphene plasmons at abrupt interfaces: An analytic and numeric study

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Autor(es):
Chaves, A. J. [1, 2] ; Amorim, B. [3] ; Bludov, Yu. V. [1, 2] ; Goncalves, P. A. D. [4, 5, 6] ; Peres, N. M. R. [1, 2]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Minho, Ctr & Dept Phys, Campus Gualtar, P-4710057 Braga - Portugal
[2] Univ Minho, QuantaLab, Campus Gualtar, P-4710057 Braga - Portugal
[3] Univ Lisbon, Inst Super Tecn, CeFEMA, Av Rovisco Pais, P-1049001 Lisbon - Portugal
[4] Tech Univ Denmark, Dept Photon Engn, DK-2800 Lyngby - Denmark
[5] Tech Univ Denmark, Ctr Nanostruct Graphene, DK-2800 Lyngby - Denmark
[6] Univ Southern Denmark, Ctr Nano Opt, Campusvej 55, DK-5230 Odense M - Denmark
Número total de Afiliações: 6
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 97, n. 3 JAN 23 2018.
Citações Web of Science: 2
Resumo

We discuss the scattering of graphene surface plasmon polaritons (SPPs) at an interface between two semi-infinite graphene sheets with different doping levels and/or different underlying dielectric substrates. We take into account retardation effects and the emission of free radiation in the scattering process. We derive approximate analytic expressions for the reflection and the transmission coefficients of the SPPs as well as the same quantities for the emitted free radiation. We show that the scattering problem can be recast as a Fredholm equation of the second kind. Such an equation can then be solved by a series expansion, with the first term of the series corresponding to our approximated analytical solution for the reflection and transmission amplitudes. We have found that almost no free radiation is emitted in the scattering process and that under typical experimental conditions the back-scattered SPP transports very little energy. This paper provides a theoretical description of graphene plasmon scattering at an interface between distinct Fermi levels, which could be relevant for the realization of plasmonic circuitry elements such as plasmonic lenses or reflectors, and for controlling plasmon propagation by modulating the potential landscape of graphene. (AU)

Processo FAPESP: 16/11814-7 - Plasmons em canais unidimensionais revestidos com o grafeno
Beneficiário:Eunezio Antonio de Souza
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
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