Super-Poissonian statistics of photon emission from single CdSe-CdS core-shell nanocrystals coupled to metal nanostructures

We demonstrate that photon antibunching observed for individual nanocrystal quantum dots (NQDs) can be transformed into photon bunching characterized by super-Poissonian statistics when they are coupled to metal nanostructures (MNs). This observation indicates that, while the quantum yield of a biex...

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Bibliographic Details
Published in:Physical review letters 2013-03, Vol.110 (11), p.117401-117401, Article 117401
Main Authors: Park, Young-Shin, Ghosh, Yagnaseni, Chen, Yongfen, Piryatinski, Andrei, Xu, Ping, Mack, Nathan H, Wang, Hsing-Lin, Klimov, Victor I, Hollingsworth, Jennifer A, Htoon, Han
Format: Article
Language:English
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Summary:We demonstrate that photon antibunching observed for individual nanocrystal quantum dots (NQDs) can be transformed into photon bunching characterized by super-Poissonian statistics when they are coupled to metal nanostructures (MNs). This observation indicates that, while the quantum yield of a biexciton (Q(2X)) is lower than that of a single exciton (Q(1X)) in freestanding NQDs, Q(2X) becomes greater than Q(1X) in NQDs coupled to MNs. This unique phenomenon is attributed to metal-induced quenching with a rate that scales more slowly with exciton multiplicity than the radiative decay rate and dominates over other nonradiative decay channels for both single excitons and biexcitons.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.110.117401