Article,

Near-field strong coupling of single quantum dots

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Science Advances, 4 (3): eaar4906 (Mar 1, 2018)<a href="https://www.br.de/radio/bayern2/programmkalender/ausstrahlung-1369978.html"style="font-style: normal;">&raquo; BR2 - IQ Wissenschaft und Forschung - Magazin (min 19:51)</a>.
DOI: 10.1126/sciadv.aar4906

Abstract

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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