Magnetic circular dichroism of non-local surface lattice resonances in magnetic nanoparticle arrays
| Autor: | Mikko Kataja, Sebastiaan van Dijken, Sara Pourjamal |
|---|---|
| Přispěvatelé: | Department of Applied Physics, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
ta114 Magnetic circular dichroism business.industry Surface plasmon ta221 Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Optics X-ray magnetic circular dichroism 0103 physical sciences Magnetic nanoparticles Surface plasmon resonance 010306 general physics 0210 nano-technology business Plasmon Circular polarization Localized surface plasmon |
| Zdroj: | Optics Express. 24(4):3562-3571 |
| ISSN: | 1094-4087 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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