Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 51: Poster: Quantum Optics and Photonics IV
Q 51.50: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Strong enhancement of radiative decay and efficient biexciton emission from a single quantum dot coupled to a plasmonic 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 Erlangen-Nürnberg, Erlangen, Germany
Semiconductor quantum dots are capable of emitting one, two or more photons after each excitation because of the possibility of generating multiple excitons within the same quantum dot. In the case where two excitons are created, recombination leads to a cascaded emission process. However, the quantum efficiency of such a two-photon emission is usually very low. In this study, we demonstrate a significant enhancement of the biexciton emission efficiency by coupling a single quantum dot to a plasmonic nanocone antenna, which was fabricated by focused ion beam milling [1]. We show that the quantum efficiency of the biexciton emission is increased by more than one order of magnitude to 70% in the coupled system. Moreover, by performing many quantitative in-situ measurements on the same quantum dot, we demonstrate more than 100-fold radiative enhancement by the gold nanocone antenna for both excitonic and biexcitonic emission channels [2].
[1] Hoffmann et al., Nanotechnology 26, 404001 (2015). [2] Matsuzaki et al., Sci. Rep. 7, 42307 (2017).