Surface-plasmon-polariton-driven narrow-linewidth magneto-optics in ni nanodisk arrays

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-01-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
9
113-121
Series
Nanophotonics, Volume 9, issue 1
Abstract
The field of magnetoplasmonics exploits interactions between light and magnetic matter at the nanoscale for light manipulation and resonant magneto-optics. One of the great challenges of this field is overcoming optical losses in magnetic metals. Here, we exploit surface plasmon polaritons (SPPs) excited at the interface of an SiO2/Au bilayer to induce strong magneto-optical responses on the Ni nanodisks of a periodic array. Using a reference system made of Au nanodisks, we show that optical losses in Ni hardly broaden the linewidth of SPP-driven magneto-optical signals. Loss mitigation is attained because the free electrons in the Ni nanodisks are driven into forced oscillations away from their plasmon resonance. By varying the SiO2 layer thickness and lattice constant of the Ni nanodisk array, we demonstrate tailoring of intense magneto-optical Kerr effects with a spectral linewidth down to ~25 nm. Our results provide important hints on how to circumvent optical losses and enhance magneto-optical signals via the design of off-resonance magnetoplasmonic driving mechanisms.
Description
Keywords
Magneto-optical Kerr effect, Magnetoplasmonics, Nanoparticle array, Surface lattice resonance, Surface plasmon polariton
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Citation
Freire-Fernández , F , Kataja , M & Van Dijken , S 2020 , ' Surface-plasmon-polariton-driven narrow-linewidth magneto-optics in ni nanodisk arrays ' , Nanophotonics , vol. 9 , no. 1 , pp. 113-121 . https://doi.org/10.1515/nanoph-2019-0331