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Journal of Nanophotonics

Emission redistribution from a quantum dot-bowtie nanoantenna
Author(s): Armin Regler; Konrad Schraml; Anna A. Lyamkina; Matthias Spiegl; Kai Müller; Jelena Vuckovic; Jonathan J. Finley; Michael Kaniber
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Paper 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.

Paper Details

Date Published: 11 March 2016
PDF: 9 pages
J. Nanophoton. 10(3) 033509 doi: 10.1117/1.JNP.10.033509
Published in: Journal of Nanophotonics Volume 10, Issue 3
Show Author Affiliations
Armin Regler, Walter Schottky Institut (Germany)
Technische Univ. München (Germany)
Konrad Schraml, Walter Schottky Institut (Germany)
Anna A. Lyamkina, A.V. Rzhanov Institute of Semiconductor Physics (Russia)
Matthias Spiegl, Walter Schottky Institut (Germany)
Kai Müller, Walter Schottky Institut (Germany)
Jelena Vuckovic, Technische Univ. München (Germany)
Stanford Univ. (United States)
Jonathan J. Finley, Walter Schottky Institut (Germany)
Nanosystems Initiative Munich (Germany)
Michael Kaniber, Walter Schottky Institut (Germany)

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