Our collaborators in CIC nanoGUNE (Paolo Vavassori and Nicolo Maccaferri) have been developing tools and expertise to unravel the response of ferromagnetic plasmonic nanoparticles, focusing on enhancing the polarization rotations of light scattered off such systems.
“Anisotropic nanoantenna-based magnetoplasmonic crystals for 
highly enhanced and tunable magneto-optical activity”, Nicolò Maccaferri, Luca Bergamini, Matteo Pancaldi, Mikołaj K. Schmidt, Mikko Kataja, Sebastiaan van Dijken, Nerea Zabala, Javier Aizpurua, and Paolo Vavassori, Nano Letters 16, 2533-2542 (2016).
here we focus on the response of 2D arrays of ellipsoidal plasmonic nanoparticles (in particular – the role of the diffractive lattice modes) which, when magnetized, rotate the polarization of the scattered field; this study is closely related to another work, which analyzes the same effect, but controls it by changing the pitch of the lattice, rather than the shape of single scatterers
Mikołaj K. Schmidt 