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Effects of a non-absorbing substrate on the magneto-optical Kerr response of plasmonic ferromagnetic nanodisks

Journal article
Authors N. Maccaferri
M. Kataja
V. Bonanni
S. Bonetti
Zhaleh Pirzadeh
Alexandre Dmitriev
S. van Dijken
Johan Åkerman
P. Vavassori
Published in Physica Status Solidi a-Applications and Materials Science
Volume 211
Issue 5
Pages 1067-1075
ISSN 1862-6300
Publication year 2014
Published at Department of Physics (GU)
Pages 1067-1075
Language en
Links dx.doi.org/10.1002/pssa.201300701
Keywords localized plasmon resonances; magneto-optical Kerr effect; magnetoplasmonics; polarizability
Subject categories Physical Sciences

Abstract

Magnetoplasmonics is an emerging field of intense research on materials combining magnetic and plasmonic functionalities. The novel optical and magneto-optical (MO) properties displayed by these materials could allow the design of a new class of magnetically controllable optical nano-devices. In this work, we investigate the effects of a non-absorbing (insulating) substrate on the MO activity of pure ferromagnetic disk-shaped nanostructures supporting localized plasmon resonances. We show that the red-shift of the localized plasmon resonance, related to the modification of the localization of the electromagnetic field due to the substrate, is not the only effect that the substrate has on the MO response. We demonstrate that the reflectivity of the substrate itself plays a key role in determining the MO response of the system. We discuss why it is so and provide a description of the modeling tools suitable to take into account both effects. Understanding the role of the substrate will permit a more aware design of magnetoplasmonic nanostructured devices for future biotechnological and optoelectronic applications. Ferromagnetic nickel nanodisk in vacuum (left) and on a non-absorbing substrate (right), illuminated by linearly polarized light. The polarization of the reflected field is changed in the first case due to a combination of intrinsic magneto-optical properties and the nanoconfinement of the material. In the second case, the polarization of the reflected light is affected also by the presence of the substrate. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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