Magnetic circular dichroism of non-local surface lattice resonances in magnetic nanoparticle arrays

Fontcuberta, Josep; Pourjamal, Sara; Dijken, Sebastiaan van

doi:10.1364/oe.24.003562

Cited by 16 publications

(18 citation statements)

References 38 publications

(45 reference statements)

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“…In contrast, the resonance width of SLR modes in magnetoplasmonic nanoparticle arrays are not strictly limited by high ohmic losses in the ferromagnets. Here, the shape and size of the individual nanoparticles and lattice parameters can be utilized to design sharp resonances in magneto-optical spectra [22][23][24][25]. The improved sensing performance of arrays with a lattice constant of 500 nm compared to those with a = 400 nm in this study is a clear manifestation of this effect.…”

Section: Resultsmentioning

confidence: 80%

“…Recently, the excitation of SLRs in arrays of ferromagnetic nickel nanoparticles was demonstrated [22]. The magneto-optical activity of an ordered ferromagnetic array is larger than that of randomly distributed nanoparticles, and it tunes sensitively with the period and symmetry of the lattice [22][23][24] or the size or shape of the nanoparticles [25]. The ability to compensate for intrinsic damping via the excitation of SLR modes offers new perspectives for refractive index sensing based on magnetoplasmonic architectures.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing

et al. 2018

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Abstract:We introduce a novel magnetoplasmonic sensor concept for sensitive detection of refractive index changes. The sensor consists of a periodic array of Ni/ SiO 2 /Au dimer nanodisks. Combined effects of near-field interactions between the Ni and Au disks within the individual dimers and far-field diffractive coupling between the dimers of the array produce narrow linewidth features in the magneto-optical Faraday spectrum. We associate these features with the excitation of surface lattice resonances and show that they exhibit a spectral shift when the refractive index of the surrounding environment is varied. Because the resonances are sharp, refractive index changes are accurately detected by tracking the wavelength where the Faraday signal crosses 0. Compared to random distributions of pure Ni nanodisks or Ni/SiO 2 /Au dimers or periodic arrays of Ni nanodisks, the sensing figure of merit of the hybrid magnetoplasmonic array is more than one order of magnitude larger.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing

et al. 2018

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“…The extinction of the array, defined as E = 1−T , is the sum of absorbed and scattered light intensities. Since the extinction cross section (σ ext ) of our sample is determined by a SLR mode that absorbs much more than it scatters, 14,15 we can write σ ext = Ep 2 ≈ σ abs . For femtosecond laser pulses, the electronic absorption of optical energy, electron-phonon thermalization and external heat diffusion ensue successively.…”

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confidence: 99%

Plasmon-induced demagnetization and magnetic switching in nickel nanoparticle arrays

Fontcuberta

Freire-Fernández

Witteveen

et al. 2018

Applied Physics Letters

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We report on the manipulation of magnetization by femtosecond laser pulses in a periodic array of cylindrical nickel nanoparticles. By performing experiments at different wavelength, we show that the excitation of collective surface plasmon resonances triggers demagnetization in zero field or magnetic switching in a small perpendicular field. Both magnetic effects are explained by plasmon-induced heating of the nickel nanoparticles to their Curie temperature. Model calculations confirm the strong correlation between the excitation of surface plasmon modes and laser-induced changes in magnetization.Plasmonic nanostructures enable strong local enhancements of the optical field in areas that are substantially smaller than the wavelength of incident light. This capability offers prospects for magnetic recording. In heat-assisted magnetic recording (HAMR), a plasmonic near-field transducer (NFT) reduces the switching field of high-anisotropy materials via local heating. 1-3 The NFT in this application is a noble metal nanostructure that is placed near the recording medium. Excitation of the NFT at the plasmon resonance frequency efficiently transfers optical energy to a nanoscale region, enabling local switching at reduced magnetic field. In the realm of ultrafast all-optical switching (AOS), 4,5 the use of noble metal plasmonic antennas has also been considered. By placing gold antennas on top of a ferrimagnetic TbFeCo film, Liu and co-workers demonstrated the confinement of magnetic switching to sub-100 nm length scales. 6 .Independent from HAMR and AOS, a new discipline combining plasmonics and magnetism has emerged recently. 7,8 Experiments on pure ferromagnetic metals demonstrate that, despite stronger ohmic damping, they also support surface plasmon resonances. [9][10][11] This raises the question if one could nanostructure the magnetic medium itself to trigger magnetic switching via local enhancements of the optical field. To study the effect of plasmon resonances on magnetic switching it is advantageous to consider ferromagnetic nanoparticles of uniform size and shape. In such nanoparticles, plasmon resonances determine the magneto-optical activity via the excitation of two orthogonal electric dipoles. 12 Plasmon resonances in single ferromagnetic nanoparticles are rather broad. Yet, ordering of the particles into a periodic array significantly narrows the spectral response. 13 In this geometry, hybridization between localized surface plasmons and the diffracted orders of the array produces intense surface lattice resonances (SLRs). SLR modes a) sebastiaan.van.dijken@aalto.fi and, thereby, the optical, magneto-optical, and magnetic circular dichroism (MCD) properties of a ferromagnetic nanoparticle array can be tuned by changing the period or symmetry of the lattice 13-15 or the shape of the nanoparticles. 16 These versatile designer tools could thus be exploited to spectrally gauge the significance of the inverse Faraday effect and MCD on all-optical switching in ferromagnetic materials, a topic of intense sc...

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“…They showed that spectral separation of the response for longitudinal and orthogonal excitations provides versatile tuning of narrow and intense magneto-optical resonances, which were enhanced 3-fold when compared with a system of randomly oriented particles. The same authors demonstrated also that SLRs significantly enhance magnetic-induced circular dichroism signal compared to randomly distributed nickel meta-atoms [ 143 ]. Similarly, arrays of elliptical nickel nanoantennas were studied by Maccaferri et al [144], who showed that the diffractive coupling in these arrays is dictated by two orthogonal and spectrally detuned in-plane LSPRs of the individual building blocks, one directly induced by the incident light, the other produced through the application of an external magnetic field.…”

Section: Far-field Diffractive Coupling In Magneto-plasmonic Crystalsmentioning

confidence: 95%

Coupling phenomena and collective effects in resonant meta-atoms supporting both plasmonic and (opto-)magnetic functionalities: an overview on properties and applications [Invited]

Maccaferri¹

2019

J. Opt. Soc. Am. B

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We review both the fundamental aspects and the applications of functional magneto-optic and opto-magnetic metamaterials displaying collective and coupling effects on the nanoscale, where the concepts of optics and magnetism merge to produce unconventional phenomena. The use of magnetic materials instead of the usual noble metals allows for an additional degree of freedom for the control of electromagnetic field properties, as well as it allows light to interact with the spins of the electrons and to actively manipulate the magnetic properties of such nanomaterials. In this context, we explore the concepts of near-field coupling of plasmon modes in magnetic meta-molecules, as well as the effect of excitation of surface lattice resonances in magneto-plasmonic crystals. Moreover, we discuss how these coupling effects can be exploited to artificially enhance optical magnetism in plasmonic meta-molecules and crystals. Finally, we highlight some of the present challenges and provide a perspective on future directions of the research towards photon-driven fast and efficient nanotechnologies bridging magnetism and optics beyond current limits.

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Magnetic circular dichroism of non-local surface lattice resonances in magnetic nanoparticle arrays

Cited by 16 publications

References 38 publications

Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing

Hybrid Ni/SiO2/Au dimer arrays for high-resolution refractive index sensing

Plasmon-induced demagnetization and magnetic switching in nickel nanoparticle arrays

Coupling phenomena and collective effects in resonant meta-atoms supporting both plasmonic and (opto-)magnetic functionalities: an overview on properties and applications [Invited]

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