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See detailEnhanced Nonlinear Emission from Single Multilayered Metal−Dielectric Nanocavities Resonating in the Near-Infrared
Maccaferri, Nicolò UL; Zilli, Attilio; Isoniemi, Tommi et al

in ACS Photonics (2021), 8(2), 512-520

Harmonic generation mechanisms are of great interest in nanoscience and nanotechnology, since they allow generating visible light by using near-infrared radiation, which is particularly suitable for its ... [more ▼]

Harmonic generation mechanisms are of great interest in nanoscience and nanotechnology, since they allow generating visible light by using near-infrared radiation, which is particularly suitable for its countless applications in bionanophotonics and optoelectronics. In this context, multilayer metal−dielectric nanocavities are widely used for light confinement and waveguiding at the nanoscale. They exhibit intense and localized resonances that can be conveniently tuned in the near-infrared and are therefore ideal for enhancing nonlinear effects in this spectral range. In this work, we experimentally investigate the nonlinear emission properties of multilayer metal−dielectric nanocavities. By engineering their absorption efficiency and exploiting their intrinsic interface-induced symmetry breaking, we achieve an almost 2 orders of magnitude higher second-harmonic generation efficiency compared to gold nanostructures featuring the same geometry and optical resonant behavior. In particular, while both the third-order nonlinear susceptibility and conversion efficiency are comparable with those of the Au nanoresonators, we estimate a second-order nonlinear susceptibility of the order of 1 pm/V, which is comparable with that of typical nonlinear crystals. We envision that our system, which combines the advantages of both plasmonic and dielectric materials, might enable the realization of composite and multifunctional nanosystems for the efficient manipulation of nonlinear optical processes at the nanoscale. [less ▲]

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See detailResonant Enhancement of Magneto-Optical Activity Induced by Surface Plasmon Polariton Modes Coupling in 2D Magnetoplasmonic Crystals
Maccaferri, Nicolò UL; Inchausti, Xabier; Garcia-Martin, Antonio et al

in ACS Photonics (2015), 2(12), 1769-1779

Magnetoplasmonic crystals are spatially periodic nanostructured magnetic surfaces combining the features of surface plasmon polariton excitation and magneto-optical tunability. Here we present a ... [more ▼]

Magnetoplasmonic crystals are spatially periodic nanostructured magnetic surfaces combining the features of surface plasmon polariton excitation and magneto-optical tunability. Here we present a comprehensive experimental and theoretical work demonstrating that in magnetoplasmonic crystals the coupling of free space radiation to surface plasmon polariton modes in conjunction with the inherent magneto-optical activity, enable cross-coupling of propagating surface plasmon polariton modes. We have explored the consequences of this unique magnetoplasmonic crystal optical feature by studying the light reflected from a two-dimensional periodic array of cylindrical holes in a ferromagnetic layer illuminated at oblique incidence and magnetized in the sample plane, namely, in the so-called longitudinal Kerr effect geometry. We observe that the magneto-optical spectral response arises from all the excitable surface plasmon polariton modes in the magnetoplasmonic crystal irrespective of the incoming light polarization. We show that this is a direct consequence of the magneto-optically mediated coupling of propagating surface plasmon polariton modes. We demonstrate that a large enhancement of the longitudinal Kerr effect is induced when special noncollinear surface plasmon polariton modes, which couple to both p- and s-polarized light, are resonantly excited. We show how the resonant enhancement of the Kerr effect can be set at desired radiation wavelengths and incidence angles by precise plasmonic band engineering achievable through the proper design of the magnetoplasmonic lattice structure. Our findings, besides clarifying the underlying physics that governs the peculiar magneto-optical properties of magnetoplasmonic crystals, open a path to the design of novel active metamaterials with tailored and enhanced magneto-optical activity. [less ▲]

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