1. Lasing in Ni Nanodisk Arrays
- Author
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Päivi Törmä, Tommi K. Hakala, Heikki Rekola, Jani-Petri Martikainen, Mikko Kataja, Francisco Freire-Fernández, Sara Pourjamal, Marek Nečada, Sebastiaan van Dijken, Tampere University, Materials Science and Environmental Engineering, Nanomagnetism and Spintronics, Department of Applied Physics, Quantum Dynamics, Aalto-yliopisto, and Aalto University
- Subjects
Active laser medium ,Materials science ,ta221 ,116 Chemical sciences ,General Physics and Astronomy ,Physics::Optics ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,7. Clean energy ,plasmonics ,surface lattice resonance ,General Materials Science ,Spontaneous emission ,Ohmic contact ,Plasmon ,Plasmonic nanoparticles ,ta114 ,business.industry ,nanolasing ,General Engineering ,Ni nanodisk array ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Optoelectronics ,loss-compensated magnetoplasmonics ,Photonics ,0210 nano-technology ,business ,Lasing threshold ,Visible spectrum - 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.
- Published
- 2019