Interaction Effects on the Magneto-optical Response of Magnetoplasmonic Dimers

TL;DR

This paper investigates how dipole-dipole interactions influence the magneto-optical properties of magnetoplasmonic dimers, revealing the potential to enhance MO activity through strategic component placement and stacking.

Contribution

It introduces a theoretical framework showing that non-magnetic plasmonic components can exhibit induced MO activity, surpassing that of magnetic components, and confirms findings with experimental validation.

Findings

Induced MO activity can be larger in plasmonic components than in magnetic ones.

Component placement significantly affects the MO spectral response.

Stacking strategies can reduce magnetic metal usage while maintaining high MO activity.

Abstract

The effect that dipole-dipole interactions have on the magneto-optical (MO) properties of magnetoplasmonic dimers is theoretically studied. The specific plasmonic versus magnetoplasmonic nature of the dimer's metallic components and their specific location within the dimer plays a crucial role on the determination of these properties. We find that it is possible to generate an induced MO activity in a purely plasmonic component, even larger than that of the MO one, therefore dominating the overall MO spectral dependence of the system. Adequate stacking of these components may allow obtaining, for specific spectral regions, larger MO activities in systems with reduced amount of MO metal and therefore with lower optical losses. Theoretical results are contrasted and confirmed with experiments for selected structures.