Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 64: Nano-Optics III
Q 64.1: Vortrag
Freitag, 4. März 2016, 11:00–11:15, f342
Enhancing the spontaneous emission rate of a single emitter by a gold nanocone antenna — •Korenobu Matsuzaki1, Hsuan-Wei Liu1, Björn Hoffmann1, Silke Christiansen1,2, Anke Dutschke1,3, Stephan Götzinger4,1, and Vahid Sandoghdar1,4 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Helmholtz Centre for Materials and Energy, Berlin, Germany — 3Carl Zeiss, Oberkochen, Germany — 4Friedrich Alexander University of Erlangen-Nürnberg, Erlangen, Germany
In a recent theoretical work, we have suggested that a gold nanocone can be an ideal plasmonic antenna, which allows one to modify the radiative decay rate of a single emitter by several thousand times while keeping its quantum efficiency high [1]. Here, we report on the first experimental realisation of this concept. The gold nanocones were fabricated by focussed ion beam milling on a glass substrate [2]. As an emitter, we used a colloidal quantum dot, which we attached to the glass tip of a near-field microscope. This configuration allowed us to position the quantum dot with nanometer precision with respect to the nanocone. We will report a reduction of the radiative lifetime by the order of one hundred times. Furthermore, we present a method to extract the radiative decay rate enhancement factor and the antenna efficiency from the experimental data by taking the photophysics of quantum dots into account. [1] Chen, Agio, and Sandoghdar, Phys. Rev. Lett. 108, 233001 (2012). [2] Hoffmann, Vassant, Chen, Götzinger, Sandoghdar, and Christiansen, Nanotechnology 26, 404001 (2015).