We present a combined experimental and simulation study of a single self-assembled InGaAs quantum dot coupled to a nearby (∼25nm) plasmonic antenna. Micro-photoluminescence spectroscopy shows a ∼2.4× increase of intensity, which is attributed to spatial far-field redistribution of the emission from the quantum dot-antenna system. Power-dependent studies show similar saturation powers of 2.5μW for both coupled and uncoupled quantum dot emission in polarization-resolved measurements. Moreover, time-resolved spectroscopy reveals the absence of Purcell-enhancement of the quantum dot coupled to the antenna as compared to an uncoupled dot, yielding comparable exciton lifetimes of τ∼0.5ns. This observation is supported by numerical simulations, suggesting only minor Purcell-effects of <2× for emitter-antenna separations >25nm. The observed increased emission from a coupled quantum dot-plasmonic antenna system is found to be in good qualitative agreement with numerical simulations and will lead to a better understanding of light-matter-coupling in such novel semiconductor-plasmonic hybrid systems
@article{arxiv.1602.01953,
title = {Emission redistribution from a quantum dot-bowtie nanoantenna},
author = {A. Regler and K. Schraml and A. Lyamkina and M. Spiegl and K. Müller and J. Vuckovic and J. J. Finley and M. Kaniber},
journal= {arXiv preprint arXiv:1602.01953},
year = {2016}
}