Lasing in Ferromagnetic Plasmonic Arrays

TL;DR

This paper demonstrates visible-wavelength lasing in ferromagnetic Ni nanodisk arrays with organic gain, showing loss compensation, directional emission, and tunable multimode lasing, advancing magnetoplasmonic and topological photonics applications.

Contribution

It introduces a novel ferromagnetic plasmonic array lasing system with loss compensation and tunable multimode operation, expanding the potential for magnetoplasmonic devices.

Findings

Lasing achieved at visible wavelengths in Ni nanodisk arrays.

Loss compensation enabled by organic gain medium.

Tunable multimode lasing observed with symmetry breaking.

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 linewidth 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 pave the way for loss-compensated magnetoplasmonic devices and topological photonics.