Circular Magnetoplasmonic Modes in Gold Nanoparticles

Pineider, Francesco; Campo, Giulio; Bonanni, Valentina; Fernández, César de Julián; Mattei, Giovanni; Caneschi, Andréa; Gatteschi, Dante; Sangregorio, Claudio

doi:10.1021/nl402394p

Cited by 120 publications

(180 citation statements)

References 21 publications

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“…While plasmonics and magnetoplasmonics (see Ref. detection scheme for label-free refractometric sensing [121]. Thermal effects associated with LSPR in nanoparticles such as hot-electron generation and its dynamics were studied by Saavedra et al [221].…”

Section: Opto-magnetism: Towards An Ultrafast Control Of Magnetismentioning

confidence: 99%

Nanoscale magnetophotonics

Maccaferri

Zubritskaya

Razdolski

et al. 2020

Journal of Applied Physics

120

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This Perspective surveys the state-of-the-art and future prospects of science and technology employing the nanoconfined light (nanophotonics and nanoplasmonics) in combination with magnetism. We denote this field broadly as nanoscale magnetophotonics. We include a general introduction to the field and describe the emerging magneto-optical effects in magnetoplasmonic and magnetophotonic nanostructures supporting localized and propagating plasmons. Special attention is given to magnetoplasmonic crystals with transverse magnetization and the associated nanophotonic non-reciprocal effects, and to magneto-optical effects in periodic arrays of nanostructures. We give also an overview of the applications of these systems in biological and chemical sensing, as well as in light polarization and phase control. We further review the area of nonlinear magnetophotonics, the semiconductor spin-plasmonics, and the general principles and applications of opto-magnetism and nano-optical ultrafast control of magnetism and spintronics.

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Section: Opto-magnetism: Towards An Ultrafast Control Of Magnetismentioning

confidence: 99%

Nanoscale magnetophotonics

Maccaferri

Zubritskaya

Razdolski

et al. 2020

Journal of Applied Physics

120

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“…Using the Ansatz (8) for the electron density, one can integrate the Lagrangian density (7) over the whole space to obtain an analytical expression for the Lagrangian of the system:…”

Section: Description Of the Modelmentioning

confidence: 99%

Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect

et al. 2018

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We theoretically investigate the creation of a magnetic moment in gold nanoparticles by circularly polarized laser light. To this end, we describe the collective electron dynamics in gold nanoparticles using a semiclassical approach based on a quantum hydrodynamic model that incorporates the principal quantum many-body and nonlocal effects, such as the electron spill-out, the Hartree potential, and the exchange and correlation effects. We use a variational approach to investigate the breathing and the dipole dynamics induced by an external electric field. We show that gold nanoparticles can build up a static magnetic moment through the interaction with a circularly polarized laser field. We analyze that the responsible physical mechanism is a plasmonic, orbital inverse Faraday effect, which can be understood from the time-averaged electron current that contains currents rotating on the nanoparticle's surface. The computed laser-induced magnetic moments are sizeable, of about 0.35 µB/atom for a laser intensity of 45 × 10 10 W/cm 2 at plasmon resonance.

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“…The calculated relative frequency shifts between the LCP and RCP magnetoplasmonic resonances, normalized to the corresponding particle plasmon resonance frequency in the absence of gyrotropy, are of the order of 10 −4 and vary increasingly by increasing the size of the cobalt core. We note that, in order to achieve these values with homogeneous noble metal nanoparticles, an external magnetic field as strong as 10 T is required [4]. It is also worth noting that the quasi-static approximation yields a too strong and slightly shifted in frequency circular dichroism signal.…”

Section: Resultsmentioning

confidence: 94%

“…Magnetic circular dichroism spectroscopy measures the difference between two absorption spectra acquired using light with opposite helicity in the presence of a magnetic field parallel to the incident light direction [4]. Since the wavelength of light is much longer than the size of the nanoparticles under consideration, their optical response can be described by a dipole polarizability tensor [32,33]:…”

Section: Resultsmentioning

confidence: 99%

“…In this context, it has been shown that 3D chiral structures and surfaces of crystals of plasma spheres in an external static uniform magnetic field that lack, simultaneously, timereversal and space-inversion symmetries exhibit a nonreciprocal spectral response [2,3], which is a key issue in the development of nonreciprocal photonic devices. Moreover, it has been reported that magnetoplasmonic modes observed on colloidal gold nanoparticles by means of magnetic circular dichroism spectroscopy could be useful for detecting changes in the refractive index of the surrounding medium and, thus, developing refractometric sensing applications [4]. However, though noble metals, like gold and silver, are excellent plasmonic materials, they show very weak magneto-optical activity at moderate magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

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Strong circular dichroism of core-shell magnetoplasmonic nanoparticles

et al. 2015

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Composite magnetoplasmonic nanoparticles with a core-shell morphology exhibit intriguing optical properties and offer impressive opportunities for tailoring in a controllable manner the light-matter interaction at subwavelength dimensions. These properties are usually analyzed in the framework of the quasi-static approximation, which, however, is often inadequate; thus, a full electrodynamic treatment is required. In this respect, we developed a rigorous method for an accurate description of electromagnetic scattering by a gyrotropic sphere coated with a nongyrotropic concentric spherical shell, based on the full multipole expansion of the wave field. The method was applied to specific examples of core-shell cobalt-silver spherical nanoparticles, where the occurrence of strong circular dichroism induced by magnetoplasmonic interaction, which largely exceeds that of homogeneous noble metal nanoparticles in an external magnetic field, was found. Our results were also explained by reference to the quasi-static approximation, which, though it reproduces the main features of the absorption spectra, strongly overestimates circular dichroism in the cases we studied.

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Circular Magnetoplasmonic Modes in Gold Nanoparticles

Cited by 120 publications

References 21 publications

Nanoscale magnetophotonics

Nanoscale magnetophotonics

Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect

Strong circular dichroism of core-shell magnetoplasmonic nanoparticles

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