Single-molecule controlled emission in planar plasmonic cavities

S Derom 1 A Bouhelier 1 Ashish Kumar 1 A Leray 2 J-C Weeber 1 S Buil 3 Xavier Quélin 3 Jean-Pierre Hermier 4, 3 G Colas Des Francs 1
1 LICB - Laboratoire Interdisciplinaire Carnot de Bourgogne
2 IRI - Institut de Recherche Interdisciplinaire [Villeneuve d'Ascq]
3 GEMAC - Groupe d'Etude de la Matière Condensée
4 IUF - Institut Universitaire de France
Abstract : We study the fluorescence emission from single dye molecules in coplanar plasmonic cavities composed of a thin gold film surrounded by two in-plane surface plasmon Bragg mirrors. We first discuss the effect of the presence of Bragg mirrors on the radiation diagram of surface plasmon coupled emission. Then, we investigate the role of the planar cavity size by single-molecule fluorescence lifetime imaging. Experimental data are compared to numerical simulations of the decay rates calculated as a function of the molecule orientation and position within the cavity. The creation of new decay channels by coupling to the cavity modes is also discussed. We measure a plasmonic Purcell factor up to five, attributed to the enhancement of the radiative rate.
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S Derom, A Bouhelier, Ashish Kumar, A Leray, J-C Weeber, et al.. Single-molecule controlled emission in planar plasmonic cavities. Physical Review B : Condensed matter and materials physics, American Physical Society, 2014, 89 (3), pp.035401. ⟨10.1103/PhysRevB.89.035401⟩. ⟨hal-01337603⟩

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