SKM 2021 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 8: Poster Session II
HL 8.4: Poster
Dienstag, 28. September 2021, 10:00–13:00, P
Using a novel scanning probe technique to strongly couple a single quantum dot to a tunable plasmonic nanogap antenna at room temperature — •Michael A. Becker1, Hsuan-Wei Liu1, Korenobu Matsuzaki1, Randhir Kumar1, Stephan Götzinger2,1, and Vahid Sandoghdar1,2 — 1Max Planck Institute for the Science of Light — 2Friedrich Alexander University of Erlangen-Nürnberg
Scanning probe techniques are indispensable methods for optical investigations of structures smaller than the diffraction limit. Moreover, techniques like atomic force microscopy and scanning near-field optical microscopy can be utilized to measure electrical and thermal conductance and probe near-field light-matter interactions. However, these types of experiments typically require sensitive and expensive state-of-the-art equipment. Here, we report on a novel and simple press-roll scanning probe technique (PRoScan) capable of performing optical near-field measurements with remarkable stability, even in the absence of any stabilization mechanism. We demonstrate its performance by a precise coupling of an individual quantum dot to a gold nanoparticle, where we can control the Purcell enhancement with nanometer-resolution. Next, we utilize the technique to create an open and tunable nanogap antenna. By tuning the resonance of the nanogap antenna and controlling the position of the single quantum dot, we can drive the system from the weak to the strong light-matter coupling regime, evidenced by a vacuum Rabi splitting and a characteristic anticrossing behaviour.