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Magnetoplasmonic nanostructures
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Uppsala University.
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Surfaces that are nanopatterned, metallic, and magnetic can support surface plasmon resonances, providing an alternative and effective way to reconfigure flat optical components. Utilising a range of near- and far-field characterisation techniques, the optical and magneto-optical properties of lithographically patterned thin magnetic films are investigated.

A magneto-optical diffractometer was designed, assembled, and commissioned to characterise periodic magneto-plasmonic nanostructures. For Ni and Co nanostructured antidot arrays, enhanced values of the magneto-optical Kerr rotation were recorded for energies and angles corresponding to excitations of surface plasmon polaritons. This enhancement was found to be thickness dependent. Modification of the optical properties via applied transverse magnetic fields and the excitation of surface plasmon polaritons, was demonstrated for an antidot array of pure Ni. The excitation was also shown to enhance the generation of second harmonics, as well as further activate nonlinear-optical mechanisms.

In order to fully resolve and explain the source of this remarkable magneto-optical activity, near field probing techniques were used. This allows for mapping the electric near-field with a sub-wavelength resolution, thereby revealing the interplay between the light and the nanostructured lattice. The measurements show that the electric near field intensification, induced by plasmon excitation, increases the polarisation conversion, which correlates to the observed magneto-optical Kerr rotation.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. , 58 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1439
Keyword [en]
Magnetism, nanostructures, plasmons, magneto-optics, magnetoplasmonics
National Category
Condensed Matter Physics Atom and Molecular Physics and Optics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-305276ISBN: 978-91-554-9724-8OAI: oai:DiVA.org:uu-305276DiVA: diva2:1037156
Public defence
2016-12-02, Polhemsalen, Lägerhyddsvägen 1, Uppsala, 10:00 (English)
Opponent
Supervisors
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Available from: 2016-11-09 Created: 2016-10-14 Last updated: 2016-11-16
List of papers
1. Modular magneto-optical diffractometer for characterizing nanostructured magnetoplasmonic crystals
Open this publication in new window or tab >>Modular magneto-optical diffractometer for characterizing nanostructured magnetoplasmonic crystals
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(English)Manuscript (preprint) (Other academic)
Keyword
Nanostructure, plasmon, magnetooptics, MOKE, magnetoplasmonics
National Category
Condensed Matter Physics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-305160 (URN)
Funder
Knut and Alice Wallenberg Foundation
Available from: 2016-10-13 Created: 2016-10-12 Last updated: 2016-10-14
2. Surface plasmons and magneto-optic activity in hexagonal Ni anti-dot arrays
Open this publication in new window or tab >>Surface plasmons and magneto-optic activity in hexagonal Ni anti-dot arrays
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2011 (English)In: Optics Express, ISSN 1094-4087, Vol. 19, no 24, 23867-23877 p.Article in journal (Refereed) Published
Abstract [en]

The influence of surface plasmons on the magneto-optic activity in a two-dimensional hexagonal array is addressed. The experiments were performed using hexagonal array of circular holes in a ferromagnetic Ni film. Well pronounced troughs are observed in the optical reflectivity, resulting from the presence of surface plasmons. The surface plasmons are found to strongly enhance the magneto-optic response (Kerr rotation), as compared to a continuous film of the same composition. The influence of the hexagonal symmetry of the pattern on the coupling between the plasmonic excitations is demonstrated, using optical diffraction measurements and theoretical calculations of the magneto-optic and of the angular dependence of the optical activity.

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-167656 (URN)10.1364/OE.19.023867 (DOI)000298322000024 ()
Available from: 2012-02-01 Created: 2012-01-31 Last updated: 2016-10-14Bibliographically approved
3. Influence of the magnetic field on the plasmonic properties of transparent Ni anti-dot arrays
Open this publication in new window or tab >>Influence of the magnetic field on the plasmonic properties of transparent Ni anti-dot arrays
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2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 101, no 6, 063107- p.Article in journal (Refereed) Published
Abstract [en]

Extraordinary optical transmission is observed due to the excitation of surface plasmon polaritons in 2-dimensional hexagonal anti-dot patterns of pure Ni thin films, grown on sapphire substrates. A strong enhancement of the polar Kerr rotation is recorded at the surface plasmon related transmission maximum. Angular resolved reflectivity measurements under an applied field reveal an enhancement and a shift of the normalized reflectivity difference upon reversal of the magnetic saturation (transverse magneto-optical Kerr effect-TMOKE). The change of the TMOKE signal clearly shows the magnetic field modulation of the dispersion relation of SPPs launched in a 2D patterned ferromagnetic Ni film. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4742931]

Keyword
surface; transmission; films
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-183901 (URN)10.1063/1.4742931 (DOI)000307862400070 ()
Available from: 2012-11-07 Created: 2012-11-05 Last updated: 2016-10-14Bibliographically approved
4. Thickness dependent enhancement of the polar magneto-optic Kerr rotation in Co magnetoplasmonic nanostructures
Open this publication in new window or tab >>Thickness dependent enhancement of the polar magneto-optic Kerr rotation in Co magnetoplasmonic nanostructures
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(English)Manuscript (preprint) (Other academic)
Keyword
Magnetooptics, nanostructures, plasmon, magnetoplasmonics
National Category
Condensed Matter Physics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-305162 (URN)
Funder
Knut and Alice Wallenberg FoundationSwedish Research CouncilSwedish Foundation for Strategic Research
Available from: 2016-10-13 Created: 2016-10-12 Last updated: 2016-10-14
5. Light Localization and Magneto-Optic Enhancement in Ni Antidot Arrays
Open this publication in new window or tab >>Light Localization and Magneto-Optic Enhancement in Ni Antidot Arrays
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2016 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 16, no 4, 2432-2438 p.Article in journal (Other academic) Published
Abstract [en]

We reveal an explicit strategy to design the magneto-optic response of a magneto-plasmonic crystal by correlating near- and far-fields effects. We use photoemission electron microscopy to map the spatial distribution of the electric near-field on a nanopatterned magnetic surface that supports plasmon polaritons. By using different photon energies and polarization states of the incident light we reveal that the electric near-field is either concentrated in spots forming a hexagonal lattice with the same symmetry as the Ni nanopattern or in stripes oriented along the Gamma-K direction of the lattice and perpendicular to the polarization direction. We show that the polarization-dependent near-field enhancement on the patterned surface is directly correlated to both the excitation of surface plasmon polaritons on the patterned surface as well as the enhancement of the polar magneto-optical Kerr effect. We obtain a relationship between the size of the enhanced magneto optical behavior and the polarization and wavelength of optical excitation. The engineering of the magneto-optic response based on the plasmon-induced modification of the optical properties introduces the concept of a magneto-plasmonic meta-structure.

Keyword
Magnetooptical effects; collective excitations; surface plasmons polaritons; photoemission electron microscopy; magneto-plasmonic crystals
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-262659 (URN)10.1021/acs.nanolett.5b05279 (DOI)000374274600045 ()27018661 (PubMedID)
Funder
Knut and Alice Wallenberg FoundationGerman Research Foundation (DFG), SFB/TRR 173German Research Foundation (DFG), DFG/GSC 266
Available from: 2015-09-17 Created: 2015-09-17 Last updated: 2016-10-14Bibliographically approved
6. Nonlocal nonlinear magneto-optical response of a magnetoplasmonic crystal
Open this publication in new window or tab >>Nonlocal nonlinear magneto-optical response of a magnetoplasmonic crystal
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2013 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 88, no 7, 075436- p.Article in journal (Refereed) Published
Abstract [en]

Surface plasma resonance (SPR) excitation in a Co-based two-dimensional magnetoplasmonic crystal was found to strongly enhance the second-harmonic generation (SHG) efficiency. Large changes in the phase shift between magnetic and nonmagnetic SHG contributions were observed in the transversal Kerr effect as a function of the incidence angle. The activation of a nonlocal quadrupole mechanism of the magnetic SHG due to the SPR excitation was found to lead to an unusual phase behavior in the vicinity of the resonance.

National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-208070 (URN)10.1103/PhysRevB.88.075436 (DOI)000323707500002 ()
Available from: 2013-09-24 Created: 2013-09-23 Last updated: 2016-10-14Bibliographically approved

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