Resonances of the magneto-optical intensity effect mediated by interaction of different modes in a hybrid magnetoplasmonic heterostructure with gold nanoparticles

TL;DR

This paper introduces a novel hybrid magnetoplasmonic heterostructure with gold nanoparticles that supports multiple optical modes, demonstrating enhanced magneto-optical effects through mode hybridization for efficient light control.

Contribution

It presents a new heterostructure supporting four optical modes and shows how mode hybridization significantly enhances magneto-optical responses.

Findings

Hybrid structure supports localized and propagating surface plasmons, and waveguide modes.

Mode hybridization leads to a significant increase in magneto-optical intensity.

Enhanced light control via mode interactions in the heterostructure.

Abstract

Here we demonstrate a novel smart magnetoplasmonic heterostructure for efficient control of light. It consists of gold nanoparticles embedded in a thin magnetic film covered with a gold layer pierces with periodic nanoslit array. Unique feature of the proposed structure is that it supports four different types of optical modes in the same frequency range including localized and propagating surface plasmons along with waveguide modes. A peculiar magneto-optical response appears at the frequencies of the mode hybridization. The most prominent result comes from hybridization of the localized and propagating plasmons leading to a significant increase of the magneto-optical intensity effect.