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Narrow-line self-assembled GaAs quantum dots for plasmonics

Title data

Zhang, Hongyi ; Huo, Yongheng ; Lindfors, Klas ; Chen, Yonghai ; Schmidt, Oliver G. ; Rastelli, Armando ; Lippitz, Markus:
Narrow-line self-assembled GaAs quantum dots for plasmonics.
In: Applied Physics Letters. Vol. 106 (March 2015) Issue 10 . - p. 101110.
ISSN 1077-3118
DOI: https://doi.org/10.1063/1.4914387

Abstract in another language

We demonstrate efficient coupling of excitons in near-surface GaAs quantum dots (QDs) to surface-plasmon polaritons. We observe distinct changes in the photoluminescence of the emitters as the distance between the QDs and the gold interface decreases. Based on an electric point-dipole model, we identify the surface plasmon launching rates for different QD-surface distances. While in conventional far-field experiments only a few percent of the emitted photons can be collected due to the high refractive index semiconductor substrate, already for distances around 30 nm the plasmon launching-rate becomes comparable to the emission rate into bulk photon modes, thus much larger than the photon collection rate. For even smaller distances, the degrading optical properties of the emitter counterweight the increasing coupling efficiency to plasmonic modes.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik III - Nanooptik > Lehrstuhl Experimentalphysik III - Nanooptik - Univ.-Prof. Dr. Markus Lippitz
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik III - Nanooptik
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 13 Nov 2015 13:19
Last Modified: 13 Nov 2015 13:19
URI: https://eref.uni-bayreuth.de/id/eprint/22206