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Q: Fachverband Quantenoptik und Photonik
Q 64: Nano-Optics III
Q 64.3: Vortrag
Freitag, 18. März 2022, 11:00–11:15, Q-H11
Room-temperature strong coupling of a single quantum dot to a tunable plasmonic nanogap antenna using a novel scanning probe technique — •Michael A. Becker1, Hsuan-Wei Liu1, Korenobu Matzusaki1, Randhir Kumar1, Stephan Götzinger2,1, and Vahid Sandoghdar1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Department of Physics, Friedrich-Alexander University of Erlangen-Nürnberg, Erlangen, Germany
Scanning probe techniques offer a workhorse for optical investigations of structures smaller than the diffraction limit. In particular, scanning near-field optical microscopy (SNOM) can be used to probe light-matter interactions at the nanometer scale. However, the mechanical stability of the tip and its nanometric distance to the sample pose severe challenges for routine and robust measurements. Here, we report on a novel and simple tip-free scanning probe technique capable of carrying out high-precision near-field optical studies on single emitters. We utilize this technique to create an open and tunable nanogap antenna that can be tuned in resonance with the exciton transition of a single semiconductor quantum dot. With nanometer precision and a remarkable mechanical stability, the single emitter is positioned at the antenna hotspot, tuning the system between the weak and strong light-matter coupling regimes. We present spectral splitting and a characteristic anticrossing behavior.