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Multiexcitonic transitions and emission of several photons per excitationcomprise a very attractive feature of semiconductor quantum dots foroptoelectronics applications. However, these higher-order radiative processesare usually quenched in colloidal quantum dots by Auger and other non-radiativedecay channels. To increase the multiexcitonic quantum efficiency, severalgroups have explored plasmonic enhancement, so far with moderate results. Bycontrolled positioning of individual quantum dots in the near field of goldnanocone antennas, we enhance the radiative decay rates of monoexcitons andbiexcitons by 109 and 100 folds at quantum efficiencies of 60% and 70%,respectively, in very good agreement with the outcome of numericalcalculations. We discuss the implications of our work for future fundamentaland applied research in nano-optics.

Strong plasmonic enhancement of biexciton emission: controlled coupling of a single quantum dot to a gold nanocone antenna