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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Arruda, Tiago J. [1] ; Bachelard, Romain [2] ; Weiner, John [1] ; Slama, Sebastian [3] ; Courteille, Philippe W. [1]
Total Authors: 5
[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
[3] Eberhardt Karls Univ Tubingen, Phys Inst, D-72076 Tubingen - Germany
Total Affiliations: 3
Document type: Journal article
Source: Physical Review A; v. 96, n. 4 OCT 30 2017.
Web of Science Citations: 5

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)

FAPESP's process: 13/04162-5 - Development of quantum sensors based on ultracold atoms
Grantee:Philippe Wilhelm Courteille
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/21194-3 - Interaction between atoms and metamaterials: Purcell effect and effective medium theories
Grantee:Tiago José Arruda
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/01491-0 - Atomic clouds under stress
Grantee:Romain Pierre Marcel Bachelard
Support type: Research Grants - Young Investigators Grants