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

Autor(es)

Arruda, Tiago J. ; Bachelard, Romain ; Weiner, John ; Courteille, Philippe W.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW B; v. 98, n. 24, p. 13-pg., 2018-12-26.

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