Magneto-Optical Activity in Nonmagnetic Hyperbolic Nanoparticles

Kuttruff, Joel; Gabbani, Alessio; Petrucci, Gaia; Zhao, Yingqi; Iarossi, Marzia; Pedrueza‐Villalmanzo, Esteban; Dmitriev, Alexandre; Parracino, Antonietta; Strangi, Giuseppe; Angelis, Francesco De; Brida, Daniele; Pineider, Francesco; Maccaferri, Nicolò

doi:10.1103/physrevlett.127.217402

Cited by 33 publications

(27 citation statements)

References 59 publications

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“…Given the recent interest in magnetoplasmonics effects in novel plasmonic materials, such as doped semiconductors and hyperbolic nanomaterials, our results are expected to provide useful tools in view of the application of magnetoplasmonic effects: on the experimental side by demonstrating the possibility to achieve large magnetic modulation even in nonmagnetic nanomaterials by applying very high magnetic fields; on the theoretical side, the importance of reducing optical losses to enlarge magnetoplasmonic effects is further affirmed by our investigation.…”

Section: Discussionsupporting

confidence: 57%

“…Several exciting results have been presented in the past decade, enriching the field of magnetoplasmonics with a wide library of material combinations, ranging from pure noble metals − or ferromagnetic metal nanostructures , to hybrid multilayered nanostructures made of either noble metals and ferromagnetic moieties. − More recently, also plasmonic transparent conductive oxide nanocrystals and nonmagnetic or magnetic hyperbolic nanostructures − have been reported to exhibit magnetoplasmonic modulation. Fascinating correlations between localized plasmons and the magneto-optical response at the excitonic resonance have also been reported in doped semiconductor nanocrystals. − To date, among homogeneous nanostructures, plasmonic ferromagnetic metal nanostructures exhibit the highest magnetoplasmonic modulation .…”

Section: Introductionmentioning

confidence: 99%

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High Magnetic Field Magneto-optics on Plasmonic Silica-Embedded Silver Nanoparticles

et al. 2022

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Tuning the plasmonic response with an external magnetic field is extremely promising to achieve active magnetoplasmonic devices, such as next generation refractometric sensors or tunable optical components. Noble metal nanostructures represent an ideal platform for studying and modeling magnetoplasmonic effects through the interaction of free electrons with external magnetic fields, even though their response is relatively low at the magnetic field intensities commonly applied in standard magneto-optical spectroscopies. Here we demonstrate a large magnetoplasmonic response of silver nanoparticles by performing magnetic circular dichroism spectroscopy at high magnetic fields, revealing a linear response to the magnetic field up to 30 T. The exploitation of such high fields allowed us to probe directly the field-induced splitting of circular plasmonic modes by performing absorption spectra with static circular polarizations, giving direct experimental evidence that the magneto-optical activity of plasmonic nanoparticles arises from the energy shift of field-split circular magnetoplasmonic modes.

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Section: Discussionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

High Magnetic Field Magneto-optics on Plasmonic Silica-Embedded Silver Nanoparticles

et al. 2022

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“…264 The efficiency of the second harmonic was proved to originate from the multiple metal-dielectric interfaces rather than symmetry-breaking, allowing for a polarization-independent implementation of multilayered antennas. Finally, magneto-optical effects have also been observed in similar hyperbolic nanoparticles, 265 opening a path toward magneto-optical modulation of multilayered antennas.…”

Section: Multilayered Metamaterialsmentioning

confidence: 92%

Photonics of time-varying media

et al. 2022

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Time-varying media have recently emerged as a new paradigm for wave manipulation, due to the synergy between the discovery of highly nonlinear materials, such as epsilon-near-zero materials, and the quest for wave applications, such as magnet-free nonreciprocity, multimode light shaping, and ultrafast switching. In this review, we provide a comprehensive discussion of the recent progress achieved with photonic metamaterials whose properties stem from their modulation in time. We review the basic concepts underpinning temporal switching and its relation with spatial scattering and deploy the resulting insight to review photonic time-crystals and their emergent research avenues, such as topological and non-Hermitian physics. We then extend our discussion to account for spatiotemporal modulation and its applications to nonreciprocity, synthetic motion, giant anisotropy, amplification, and many other effects. Finally, we conclude with a review of the most attractive experimental avenues recently demonstrated and provide a few perspectives on emerging trends for future implementations of time-modulation in photonics.

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“…In magnetic-plasmonic heterostructures, depending on the relative amount of the plasmonic and the magnetic phases, the spectral contribution of both can be detected. A typical weak derivative-like line shape is expected for the LSPR in the MCD spectrum, arising from the magnetic field induced splitting between the circular magnetoplasmonic modes excited by right (left) circularly polarized light. − However, since the MCD signal is proportional to the magnetization of the sample, the spectrum is here dominated by the magneto-optical (MO) transitions of the iron oxide phase . This is also confirmed by simulating the MCD contribution expected for the LSPR starting from the absorption peak parameters and using the cyclotron shift approximation, which yields a differential absorption (Δ A ) value in the order of 10 –5 , two orders of magnitude smaller than the experimental spectrum (for details, see Supporting Information and Figure S5).…”

Section: Resultsmentioning

confidence: 55%

Star-Shaped Magnetic-Plasmonic Au@Fe₃O₄ Nano-Heterostructures for Photothermal Therapy

Muzzi

Albino

Gabbani

et al. 2022

ACS Appl. Mater. Interfaces

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Here, we synthesize a Au@Fe 3 O 4 core@shell system with a highly uniform unprecedented star-like shell morphology with combined plasmonic and magnetic properties. An advanced electron microscopy characterization allows assessing the multifaceted nature of the Au core and its role in the growth of the peculiar epitaxial star-like shell with excellent crystallinity and homogeneity. Magnetometry and magneto-optical spectroscopy revealed a pure magnetite shell, with a superior saturation magnetization compared to similar Au@Fe 3 O 4 heterostructures reported in the literature, which is ascribed to the star-like morphology, as well as to the large thickness of the shell. Of note, Au@Fe 3 O 4 nanostar-loaded cancer cells displayed magnetomechanical stress under a low frequency external alternating magnetic field (few tens of Hz). On the other hand, such a uniform, homogeneous, and thick magnetite shell enables the shift of the plasmonic resonance of the Au core to 640 nm, which is the largest red shift achievable in Au@Fe 3 O 4 homogeneous core@shell systems, prompting application in photothermal therapy and optical imaging in the first biologically transparent window. Preliminary experiments performing irradiation of a stable water suspension of the nanostar and Au@Fe 3 O 4 -loaded cancer cell culture suspension at 658 nm confirmed their optical response and their suitability for photothermal therapy. The outstanding features of the prepared system can be thus potentially exploited as a multifunctional platform for magnetic-plasmonic applications.

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Magneto-Optical Activity in Nonmagnetic Hyperbolic Nanoparticles

Cited by 33 publications

References 59 publications

High Magnetic Field Magneto-optics on Plasmonic Silica-Embedded Silver Nanoparticles

High Magnetic Field Magneto-optics on Plasmonic Silica-Embedded Silver Nanoparticles

Photonics of time-varying media

Star-Shaped Magnetic-Plasmonic Au@Fe₃O₄ Nano-Heterostructures for Photothermal Therapy

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Magneto-Optical Activity in Nonmagnetic Hyperbolic Nanoparticles

Cited by 33 publications

References 59 publications

High Magnetic Field Magneto-optics on Plasmonic Silica-Embedded Silver Nanoparticles

High Magnetic Field Magneto-optics on Plasmonic Silica-Embedded Silver Nanoparticles

Photonics of time-varying media

Star-Shaped Magnetic-Plasmonic Au@Fe3O4 Nano-Heterostructures for Photothermal Therapy

Contact Info

Product

Resources

About

Star-Shaped Magnetic-Plasmonic Au@Fe₃O₄ Nano-Heterostructures for Photothermal Therapy