Monday, October 1, 2012

1209.6566 (C. Belacel et al.)

Controlling spontaneous emission with plasmonic optical patch antennas    [PDF]

C. Belacel, B. Habert, F. Bigourdan, F. Marquier, J. -P. Hugonin, S. Michaelis de Vasconcellos, X. Lafosse, L. Coolen, C. Schwob, C. Javaux, B. Dubertret, J. -J. Greffet, P. Senellart, A. Maitre
We experimentally demonstrate the control of the spontaneous emission rate and the radiation pattern of colloidal quantum dots deterministically positioned in a plasmonic patch antenna. The antenna consists of a thin gold microdisk 30 nm above a thick gold layer. The emitters are shown to radiate through the entire patch antenna in a highly directional and vertical radiation pattern. Strong acceleration of spontaneous emission is observed, depending of the antenna size. Considering the double dipole structure of the emitters, this corresponds to a Purcell factor up to 80 for dipoles perpendicular to the disk.
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