2016/08/28 by Korenobu Matsuzaki, Matsuzaki, Korenobu, Simon Vassant +19 · 1 citation
Engineering · Materials Science · #FOS: Physical sciences #Gold and Silver Nanoparticles Synthesis and Applications #Optics (physics.optics) #Plasmonic and Surface Plasmon Research #Quantum Dots Synthesis And Properties
paper · pdf · doi:10.48550/arxiv.1608.07843
openalex publication_date 2016/08/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
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 non-radiative 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.