Abstract
We present a combined experimental and simulation study of a single self-assembled InGaAs quantum dot coupled to a nearby (∼25 nm) plasmonic antenna. Microphotoluminescence 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 2.5 μW 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 with an uncoupled dot, yielding comparable exciton lifetimes of τ∼0.5 ns. This observation is supported by numerical simulations, suggesting only minor Purcell-effects of <2× for emitter-antenna separations >25 nm. 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 semiconductor-plasmonic hybrid systems.
| Original language | English |
|---|---|
| Article number | 033509 |
| Journal | Journal of Nanophotonics |
| Volume | 10 |
| Issue number | 3 |
| DOIs | |
| State | Published - 1 Jul 2016 |
Keywords
- Purcell-effect
- light-matter-interaction
- nanoantenna
- plasmonics
- quantum dot
- semiconductor
- spatial redistribution