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Lasing in Ni Nanodisk Arrays.

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.

SUBMITTER: Pourjamal S

PROVIDER: S-EPMC6543507 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

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Lasing in Ni Nanodisk Arrays.

Pourjamal Sara S Hakala Tommi K TK Nečada Marek M Freire-Fernández Francisco F Kataja Mikko M Rekola Heikki H Martikainen Jani-Petri JP Törmä Päivi P van Dijken Sebastiaan S

ACS nano 20190415 5

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 dir ...[more]

PMID: 30973219

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