Self-aligned placement and detection of quantum dots on the tips of individual conical plasmonic nanostructures.
Hybrid structures of few or single quantum dots (QDs) coupled to single optical antennas are of prime interest for nano-optical research. The photoluminescence (PL) signal from single nanoemitters, such as QDs, can be enhanced, and their emission characteristics modified, by coupling them to plasmonic nanostructures. Here, a self-aligned technique for placing nanoscale QDs with about 10 nm lateral accuracy and well-defined molecular distances to the tips of individual nanocones is reported. This way the QDs are positioned exactly in the high near-field region that can be created near the cone apex. The cones are excited in the focus of a radially polarized laser beam and the PL signal of few or single QDs on the cone tips is spectrally detected.
Institute for Applied Physics, Eberhard Karls University of Tübingen and Center LISA+, Auf der Morgenstelle 10, 72076 Tübingen, Germany. julia.fulmes@yahoo.de monika.fleischer@uni-tuebingen.de.
Julia
J
Fulmes
Regina
R
Jäger
Annika
A
Bräuer
Christian
C
Schäfer
Sebastian
S
Jäger
Dominik A
DA
Gollmer
Andreas
A
Horrer
Elke
E
Nadler
Thomas
T
Chassé
Dai
D
Zhang
Alfred J
AJ
Meixner
Dieter P
DP
Kern
Monika
M
Fleischer