Abstract：
:Multiexcitonic transitions and emission of several photons per excitation comprise a very attractive feature of semiconductor quantum dots for optoelectronics applications. However, these higher-order radiative processes are usually quenched in colloidal quantum dots by Auger and other nonradiative decay channels. To increase the multiexcitonic quantum efficiency, several groups have explored plasmonic enhancement, so far with moderate results. By controlled positioning of individual quantum dots in the near field of gold nanocone antennas, we enhance the radiative decay rates of monoexcitons and biexcitons by 109 and 100 folds at quantum efficiencies of 60 and 70%, respectively, in very good agreement with the outcome of numerical calculations. We discuss the implications of our work for future fundamental and applied research in nano-optics.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Matsuzaki K,Vassant S,Liu HW,Dutschke A,Hoffmann B,Chen X,Christiansen S,Buck MR,Hollingsworth JA,Götzinger S,Sandoghdar Vdoi
10.1038/srep42307subject
Has Abstractpub_date
2017-02-14 00:00:00pages
42307issn
2045-2322pii
srep42307journal_volume
7pub_type
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