Polarizability and magnetoplasmonic properties of magnetic general nanoellipsoids
Journal article, 2013
An approach to compute the polarizability tensor of magnetic nanoparticles having general ellipsoidal shape is presented. We find a surprisingly excellent quantitative agreement between calculated and experimental magneto-optical spectra measured in the polar Kerr configuration from nickel nanodisks of large size (exceeding 100 nm) with circular and elliptical shape. In spite of its approximations and simplicity, the formalism presented here captures the essential physics of the interplay between magneto-optical activity and the plasmonic resonance of the individual particle. The results highlight the key role of the dynamic depolarization effects to account for the magneto-optical properties of plasmonic nanostructures.
arrays
metal nanoparticles
light-scattering
enhanced fields
faraday-rotation
dynamic depolarization
optical-properties
particles
surface
nanowire
magnetooptical activity
Author
N. Maccaferri
Nanomagnetism Group
J. B. Gonzalez-Diaz
Nanomagnetism Group
Stefano Bonetti
Stanford University
A. Berger
Nanomagnetism Group
M. Kataja
Aalto University
S. van Dijken
Aalto University
Josep Nogues
Institut Catala de Nanociencia i Nanotecnologia
Valentina Bonanni
Consiglo Nazionale Delle Richerche
Zhaleh Pirzadeh Irannezhad
Chalmers, Applied Physics, Bionanophotonics
Alexander Dmitriev
Chalmers, Applied Physics, Bionanophotonics
Johan Åkerman
Royal Institute of Technology (KTH)
Paolo Vavassori
Nanomagnetism Group
Basque Foundation for Science (Ikerbasque)
Optics Express
1094-4087 (ISSN) 10944087 (eISSN)
Vol. 21 8 9875-9889Subject Categories
Atom and Molecular Physics and Optics
DOI
10.1364/OE.21.009875