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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.)

Tunable Fano resonances in the decay rates of a pointlike emitter near a graphene-coated nanowire

Texto completo
Autor(es):
Arruda, Tiago J. [1] ; Bachelard, Romain [2] ; Weiner, John [1] ; Courteille, Philippe W. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 98, n. 24 DEC 26 2018.
Citações Web of Science: 3
Resumo

Based on the Lorenz-Mie theory, we derive analytical expressions of radiative and nonradiative transition rates for different orientations of a point dipole emitter in the vicinity of an infinitely long circular cylinder of arbitrary radius. Special attention is devoted to the spontaneous decay rate of a dipole emitter near a subwavelength-diameter nanowire coated with a graphene monolayer. We show that plasmonic Fano resonances associated with light scattering by graphene-coated nanowires appear in the Purcell factor as a function of transition wavelength. Furthermore, the Fano line shape of transition rates can be tailored and electrically tuned by varying the distance between emitter and cylinder and by modulating the graphene chemical potential, where the Fano asymmetry parameter is proportional to the square root of the chemical potential. This gate-voltage-tunable Fano resonance leads to a resonant enhancement and suppression of light emission in the far-infrared range of frequencies. This result could be explored in applications involving ultrahigh-contrast switching for spontaneous emission in specifically designed tunable plasmonic nanostructures. (AU)

Processo FAPESP: 13/04162-5 - Desenvolvimento de sensores quânticos com átomos ultrafrios
Beneficiário:Philippe Wilhelm Courteille
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 15/21194-3 - Interação entre átomos e metamateriais: efeito Purcell e teoria de meios efetivos
Beneficiário:Tiago José Arruda
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 14/01491-0 - Nuvens atômicas sob estresse
Beneficiário:Romain Pierre Marcel Bachelard
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores