Skip to Main content Skip to Navigation
Journal articles

Temperature dependence of quantum dot fluorescence assisted by plasmonic nanoantennas

Abstract : Optical antennas based on noble metal nanoparticles can increase the photoluminescence of quantum dots, but the exact strength of this enhancement depends on the brightness (i.e., the intrinsic quantum yield ηi) of the emitters. Here we perform temperature-dependent measurements on a system of PbS colloidal quantum dots coupled with Au ring arrays that bring quantitative insight into this phenomenon. We show that although the boost in photoluminescence is lower at cryogenic temperatures where the nanocrystals become very bright emitters, the spectral signature of this enhancement is remarkably independent of ηi . These observations remain true even at wavelengths where the losses by absorption in the metal nanoparticles considerably increase due to the excitation of localized plasmon resonances, in contradiction with standard theory that treats the emitters as a collection of two-level systems. We propose a mechanism in which the quantum dots are modeled as multilevel and inhomogeneously broadened emitters to account for these findings.
Document type :
Journal articles
Complete list of metadata

Cited literature [30 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01636515
Contributor : Fatima Pereira <>
Submitted on : Friday, November 17, 2017 - 1:24:52 PM
Last modification on : Wednesday, February 17, 2021 - 3:26:07 PM
Long-term archiving on: : Sunday, February 18, 2018 - 12:20:23 PM

File

PhysRevB.91.085412.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Q. Le-Van, X. Le Roux, T. V. Teperik, B. Habert, F. Marquier, et al.. Temperature dependence of quantum dot fluorescence assisted by plasmonic nanoantennas. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2015, 91 (8), pp.85412 ⟨10.1103/PhysRevB.91.085412⟩. ⟨hal-01636515⟩

Share

Metrics

Record views

148

Files downloads

500