Fano resonances and fluorescence enhancement of a dipole emitter near a plasmonic nanoshell

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW A; v. 96, n. 4, p. 11-pg., 2017-10-30.

Resumo

We analytically study the spontaneous emission of a single optical dipole emitter in the vicinity of a plasmonic nanoshell, based on the Lorenz-Mie theory. We show that the fluorescence enhancement due to the coupling between optical emitter and sphere can be tuned by the thickness ratio of the core-shell nanosphere and by the distance between the quantum emitter and its surface. In particular, we demonstrate that both the enhancement and quenching of the fluorescence intensity are associated with plasmonic Fano resonances induced by near- and far-field interactions. These Fano resonances have asymmetry parameters whose signs depend on the orientation of the dipole with respect to the spherical nanoshell. We also show that if the atomic dipole is oriented tangentially to the nanoshell, the interaction exhibits saddle points in the near- field energy flow. This results in a Lorentzian fluorescence enhancement response in the near field and a Fano line shape in the far field. The signatures of this interaction may have interesting applications for sensing the presence and the orientation of optical emitters in close proximity to plasmonic nanoshells. (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