Lasing in Ni Nanodisk Arrays

Sara Pourjamal, Tommi K. Hakala*, Marek Nečada, Francisco Freire-Fernández, Mikko Kataja, Heikki Rekola, Jani Petri Martikainen, Päivi Törmä, Sebastiaan Van Dijken

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)
92 Downloads (Pure)

Abstract

We report on lasing at visible wavelengths in arrays of ferromagnetic Ni nanodisks overlaid with an organic gain medium. We demonstrate that by placing an organic gain material within the mode volume of the plasmonic nanoparticles both the radiative and, in particular, the high ohmic losses of Ni nanodisk resonances can be compensated. Under increasing pump fluence, the systems exhibit a transition from lattice-modified spontaneous emission to lasing, the latter being characterized by highly directional and sub-nanometer line width emission. By breaking the symmetry of the array, we observe tunable multimode lasing at two wavelengths corresponding to the particle periodicity along the two principal directions of the lattice. Our results are relevant for loss-compensated magnetoplasmonic devices and topological photonics.

Original languageEnglish
Pages (from-to)5686-5692
Number of pages7
JournalACS Nano
Volume13
Issue number5
Early online date1 Jan 2019
DOIs
Publication statusPublished - 28 May 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • loss-compensated magnetoplasmonics
  • nanolasing
  • Ni nanodisk array
  • plasmonics
  • surface lattice resonance

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