SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Plasmonics and Nanooptics II: Light-Matter Interaction and Spectroscopy I

O 58.9: Vortrag

Mittwoch, 29. März 2023, 17:15–17:30, WIL A317

Anticrossing of a plasmonic nanoresonator mode and a single quantum dot at room temperature — •Daniel Friedrich¹, Jin Qin¹, Benedikt Schurr¹, Tommaso Tufarelli², Heiko Gross¹, and Bert Hecht¹ — ¹NanoOptics & Biophotonics Group, Experimental Physics 5, University of Würzburg, Germany — ²School of Mathematical Sciences and Centre for the Mathematics andTheoretical Physics of Quantum Non-Equilibrium Systems, Universityof Nottingham, United Kingdom

At ambient conditions strong coupling (SC) is achieved due to the extremely small mode volume of plasmonic nanoresonators and the broadband spectral overlap between emitter and nanocavity. This results in ultrafast energy transfer which overcomes dephasing. Normal mode splittings in luminescence spectra of single quantum systems coupled to plasmonic nanoresonators have been reported and exploited to estimate the light-matter coupling strength g. However, there is only sketchy evidence for the hallmark of single-emitter strong coupling, the anticrossing of emitter and cavity resonances. Here, we exploit the light-induced oxygen-dependent blue-shift of individual CdSe/ZnS semiconductor quantum dots to tune their transition energy across the weakly radiative resonance of a scanning plasmonic slit resonator. The observed anticrossing in photoluminescence spectra recorded as a function of time provide clear proof of SC as well as a solid measure for the single-emitter coupling strength consistent with classical field simulations and a quantum model including dissipation.