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Q: Fachverband Quantenoptik und Photonik
Q 7: Nano-Optics (Microscopy and Plasmonics)
Q 7.6: Vortrag
Montag, 9. März 2020, 15:30–15:45, a310
Strong coupling of single quantum dots in a plasmonic antenna at room temperature — •Hsuan-Wei Liu1, Randhir Randhir Kumar1, 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
Plasmonic antennas are capable of enhancing the spontaneous emission rate of single emitters due to their strong electric field confinement [1]. It has been reported that a nanogap antenna formed by a gold nanoparticle separated from a metallic substrate by a thin dielectric gap can achieve ultra-strong enhancement [2]. When the enhanced emission rate is fast enough to compete with the room temperature dephasing and the plasmon losses rates, the emitter starts to interact coherently with the plasmon mode, bringing the system into the strong coupling regime. In this study, we demonstrate a significant enhancement of a single quantum dot coupled to a plasmonic nanogap antenna. We observe an ultrafast fluorescence lifetime less than 38 ps limited by the instrumental response function. Moreover, by controlling the position of the quantum dot with respect to the nanogap antenna, we can tune the system from the weak coupling to the strong coupling regime leading to vacuum Rabi splitting in the fluorescence spectra [3].
[1] Matsuzaki et al., Sci. Rep. 7, 42307 (2017). [2] Chikkaraddy et al., Nature 535, 127-130 (2016). [3] Liu et al., in preparation.