title: Strong plasmonic enhancement of biexciton emission: controlled coupling of a single quantum dot to a gold nanocone antenna.
abstract: 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 nonradiative 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.
authors.affiliation: Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany.
authors.forename: Korenobu
authors.initials: K
authors.lastname: Matsuzaki
authors.affiliation: Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany.
authors.forename: Simon
authors.initials: S
authors.lastname: Vassant
authors.affiliation: Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany.
authors.forename: Hsuan-Wei
authors.initials: HW
authors.lastname: Liu
authors.affiliation: Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany.|Carl Zeiss Microscopy GmbH, Carl-Zeiss-Str. 22, 73447 Oberkochen, Germany.
authors.forename: Anke
authors.initials: A
authors.lastname: Dutschke
authors.affiliation: Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany.
authors.forename: Björn
authors.initials: B
authors.lastname: Hoffmann
authors.affiliation: Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany.
authors.forename: Xuewen
authors.initials: X
authors.lastname: Chen
authors.affiliation: Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany.|Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany.
authors.forename: Silke
authors.initials: S
authors.lastname: Christiansen
authors.affiliation: Materials Physics &Applications: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Buck
authors.affiliation: Materials Physics &Applications: Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Hollingsworth
authors.affiliation: Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany.|Department of Physics and Graduate School of Advanced Optical Technologies, Friedrich Alexander University Erlangen-Nuremberg, D-91058 Erlangen, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Götzinger
authors.affiliation: Max Planck Institute for the Science of Light, Staudtstr. 2, D-91058 Erlangen, Germany.|Department of Physics and Graduate School of Advanced Optical Technologies, Friedrich Alexander University Erlangen-Nuremberg, D-91058 Erlangen, Germany.
authors.forename: Vahid
authors.initials: V
authors.lastname: Sandoghdar