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Sci Adv. 2018 Mar 2;4(3):eaar4906. doi: 10.1126/sciadv.aar4906. eCollection 2018 Mar.

Near-field strong coupling of single quantum dots.

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Nano-Optics and Biophotonics Group, Experimentelle Physik 5 and Röntgen Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, UK.


Strong coupling and the resultant mixing of light and matter states is an important asset for future quantum technologies. We demonstrate deterministic room temperature strong coupling of a mesoscopic colloidal quantum dot to a plasmonic nanoresonator at the apex of a scanning probe. Enormous Rabi splittings of up to 110 meV are accomplished by nanometer-precise positioning of the quantum dot with respect to the nanoresonator probe. We find that, in addition to a small mode volume of the nanoresonator, collective coherent coupling of quantum dot band-edge states and near-field proximity interaction are vital ingredients for the realization of near-field strong coupling of mesoscopic quantum dots. The broadband nature of the interaction paves the road toward ultrafast coherent manipulation of the coupled quantum dot-plasmon system under ambient conditions.

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