Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 27: Nano-Optics III
Q 27.2: Talk
Tuesday, March 7, 2017, 14:45–15:00, P 11
100-fold Enhancement of Spontaneous Emission from a Single Quantum Dot by a Gold Nanocone Antenna — •Hsuan-Wei Liu1, Korenobu Matsuzaki1, Stephan Götzinger2, 1, and Vahid Sandoghdar1, 2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Friedrich Alexander University of Erlangen-Nürnberg, Erlangen, Germany
Control and enhancement of spontaneous emission has been an intriguing and active topic of research in the past few decades. Previously, we have theoretically suggested that a plasmonic gold nanocone antenna is promising for achieving spontaneous emission enhancements exceeding 1000 while maintaining a high quantum efficiency [1]. Here, we report on first experiments corresponding to this concept. The gold nanocones were fabricated by focused ion beam milling on a glass substrate [2]. By positioning a single semiconductor quantum dot with nanometer accuracy in the near field of the nanocone antenna, we observed large lifetime reductions for both monoexciton and biexciton emission. By performing saturation studies and analysing the photon statistics, we determined the radiative decay rate enhancement of the monoexciton and biexciton emission to be 109 and 100 folds with quantum efficiencies of 60% and 70%, respectively [3]. Such large enhancements open the door to many applications in light emitting technologies and fundamental research. [1] X. Chen, M. Agio, and V. Sandoghdar, Phys. Rev. Lett. 108, 233001 (2012). [2] B. Hoffmann et al., Nanotechnology 26, 404001 (2015). [3] K. Matsuzaki et al., arXiv.:1608.07843 (2016).