Transverse Magneto-Optical Kerr Effect in Active Magneto-Plasmonic Structures

TL;DR

This paper introduces a theoretical method to enhance the transverse magneto-optical Kerr effect in magneto-plasmonic nanostructures by using an active dielectric layer with gain properties, leading to increased resonance quality.

Contribution

It presents a novel approach of incorporating a gain layer with doped rare-earth ions to amplify TMOKE in magneto-plasmonic structures, improving resonance quality.

Findings

Enhanced TMOKE observed near SPP resonances due to gain layer.

Decrease in SPP damping increases Q-factor and TMOKE.

Theoretical analysis shows potential for improved magneto-optical devices.

Abstract

We propose a novel method to enhance the transverse magneto-optical Kerr effect (TMOKE) in the magneto-plasmonic (MP) nanostructures by means of the active dielectric layer. We report the theoretical analysis of the magnetoplasmonic structure with a ferromagnetic dielectric doped with rear-earth ions (Nd3+) as the example of a gain layer. The enhancement takes place near the surface plasmon polariton (SPP) resonances of the nanostructures. The stimulated emission of the dopants in the field of SPP wave partially compensates its losses. It is shown that due to a decrease of SPP damping a Q-factor of the MP resonance increases and the TMOKE is increased in comparison with the passive nanostructure.