Reference : Tunable magnetoplasmonics in lattices of Ni/SiO2/Au dimers
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/39716
Tunable magnetoplasmonics in lattices of Ni/SiO2/Au dimers
English
Pourjamal, Sara [Aalto University School of Science]
Kataja, Mikko [Institut de Ciencia de Materials de Barcelona (ICMAB-CSIC)]
Maccaferri, Nicolò mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Vavassori, Paolo [CIC nanoGUNE > > > ; Ikerbasque, Basque Foundation for Science]
van Dijken, Sebastiaan [Aalto University School of Science]
2019
Scientific Reports
Nature Publishing Group
9
9907
Yes
International
2045-2322
London
United Kingdom
[en] We present a systematic study on the optical and magneto-optical properties of Ni/SiO2/Au dimer lattices. By consideringthe excitation of orthogonal dipoles in the Ni and Au nanodisks, we analytically demonstrate that the magnetoplasmonicresponse of dimer lattices is governed by a complex interplay of near- and far-field interactions. Near-field coupling betweendipoles in Ni and low-loss Au enhances the polarizabilty of single dimers compared to that of isolated Ni nanodisks. Far-fielddiffractive coupling in periodic lattices of these two particle types enlarges the difference in effective polarizability further.This effect is explained by an inverse relationship between the damping of collective surface lattice resonances and theimaginary polarizability of individual scatterers. Optical reflectance measurements, magneto-optical Kerr effect spectra, andfinite-difference time-domain simulations confirm the analytical results. Hybrid dimer arrays supporting intense plasmonexcitations are a promising candidate for active magnetoplasmonic devices.
http://hdl.handle.net/10993/39716
10.1038/s41598-019-46058-2
https://www.nature.com/articles/s41598-019-46058-2

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