Lasing in Ni Nanodisk Arrays

[Image: see text] 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 ohm...

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Detalles Bibliográficos
Autores principales: Pourjamal, Sara, Hakala, Tommi K., Nečada, Marek, Freire-Fernández, Francisco, Kataja, Mikko, Rekola, Heikki, Martikainen, Jani-Petri, Törmä, Päivi, van Dijken, Sebastiaan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2019
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6543507/
https://www.ncbi.nlm.nih.gov/pubmed/30973219
http://dx.doi.org/10.1021/acsnano.9b01006
Descripción
Sumario:[Image: see text] 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.