Magnetic circular dichroism of non-local surface lattice resonances in magnetic nanoparticle arrays
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2016-02-22
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Language
en
Pages
10
3562-3571
3562-3571
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OPTICS EXPRESS, Volume 24, issue 4
Abstract
Subwavelength metallic particles support plasmon resonances that allow extreme confinement of light down to the nanoscale. Irradiation with left- and right hand circularly polarized light results in the excitation of circular plasmon modes with opposite helicity. The Lorenz force lifts the degeneracy of the two modes in magnetic nanoparticles. Consequently, the confinement and frequency of localized surface plasmon resonances can be tuned by an external magnetic field. In this paper, we experimentally demonstrate this effect for nickel nanoparticles using magnetic circular dichroism (MCD). Besides, we show that non-local surface lattice resonances in periodic arrays of the same nanoparticles significantly enhance the MCD signal. A numerical model based on the modified long wavelength approximation is used to reproduce the main features in the experimental spectra and provide design rules for large MCD effects in sensing applications.Description
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Kataja , V , Pourjamal , S & Van Dijken , S 2016 , ' Magnetic circular dichroism of non-local surface lattice resonances in magnetic nanoparticle arrays ' , Optics Express , vol. 24 , no. 4 , pp. 3562-3571 . https://doi.org/10.1364/OE.24.003562
