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Thickness dependent enhancement of the polar Kerr rotation in Co magnetoplasmonic nanostructures

AuthorsRowan-Robinson, Richard M.; Melander, Emil; Chioar, Ioan-Augustin; Caballero, Blanca; García-Martín, Antonio ; Papaioannou, E. Th.; Kapaklis, Vassilios
Issue DateFeb-2019
PublisherAmerican Institute of Physics
CitationAIP Advances 9: 025317 (2019)
AbstractLarge surface plasmon polariton assisted enhancement of the magneto-optical activity has been observed in the past, through spectral measurements of the polar Kerr rotation in Co hexagonal antidot arrays. Here, we report a strong thickness dependence, which is unexpected given that the Kerr effect is considered a surface sensitive phenomena. The maximum Kerr rotation was found to be -0.66 degrees for a 100 nm thick sample. This thickness is far above the typical optical penetration depth of a continuous Co film, demonstrating that in the presence of plasmons the critical lengthscales are dramatically altered, and in this case extended. We therefore establish that the plasmon enhanced Kerr effect does not only depend on the in-plane structuring of the sample, but also on the out-of-plane geometrical parameters, which is an important consideration in magnetoplasmonic device design.
Publisher version (URL)http://dx.doi.org/10.1063/1.5079713
Identifiersdoi: 10.1063/1.5079713
e-issn: 2158-3226
Appears in Collections:(IMN-CNM) Artículos
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