Probing the mechanisms of large Purcell enhancement in plasmonic nanoantennas

Published

Journal Article

© 2014 Macmillan Publishers Limited. All rights reserved. To move nanophotonic devices such as lasers and single-photon sources into the practical realm, a challenging list of requirements must be met, including directional emission, room-temperature and broadband operation, high radiative quantum efficiency and a large spontaneous emission rate. To achieve these features simultaneously, a platform is needed for which the various decay channels of embedded emitters can be fully understood and controlled. Here, we show that all these device requirements can be satisfied by a film-coupled metal nanocube system with emitters embedded in the dielectric gap region. Fluorescence lifetime measurements on ensembles of emitters reveal spontaneous emission rate enhancements exceeding 1,000 while maintaining high quantum efficiency (>0.5) and directional emission (84% collection efficiency). Using angle-resolved fluorescence measurements, we independently determine the orientations of emission dipoles in the nanoscale gap. Incorporating this information with the three-dimensional spatial distribution of dipoles into full-wave simulations predicts time-resolved emission in excellent agreement with experiments.

Full Text

Duke Authors

Cited Authors

  • Akselrod, GM; Argyropoulos, C; Hoang, TB; Ciracì, C; Fang, C; Huang, J; Smith, DR; Mikkelsen, MH

Published Date

  • January 1, 2014

Published In

Volume / Issue

  • 8 / 11

Start / End Page

  • 835 - 840

Electronic International Standard Serial Number (EISSN)

  • 1749-4893

International Standard Serial Number (ISSN)

  • 1749-4885

Digital Object Identifier (DOI)

  • 10.1038/nphoton.2014.228

Citation Source

  • Scopus