Abstract
Nonlinear magneto-plasmonics (NMP) describes systems where nonlinear optics, magnetics and plasmonics are all involved. In such systems, nonlinear magneto-optical Kerr effect (nonlinear MOKE) plays an important role as a characterization method, and Surface Plasmons (SPs) work as catalyst to induce many new effects. Magnetization-induced second-harmonic generation (MSHG) is the major nonlinear magneto-optical process involved. The new effects include enhanced MSHG, controlled and enhanced magnetic contrast, etc. Nanostructures such as thin films, nanoparticles, nanogratings, and nanoarrays are critical for the excitation of SPs, which makes NMP an interdisciplinary research field in nanoscience and nanotechnology. In this review article, we organize recent work in this field into two categories: surface plasmon polaritons (SPPs) representing propagating surface plasmons, and localized surface plasmons (LSPs), also called particle plasmons. We review the structures, experiments, findings, and the applications of NMP from various groups.
Highlights
Surface plasmons (SPs) consist of coherent delocalized electrons that exist at the interface between a metal and a dielectric [1,2,3]
We review the interdisciplinary studies at the intersection of Nonlinear Plasmonics (NP) and Magneto-Plasmonics (MP), referred to as Nonlinear MagnetoPlasmonics (NMP)
We have reviewed the studies in nonlinear magneto-plasmonics (NMP), from the experiments, structures, scientific findings to possible applications
Summary
Surface plasmons (SPs) consist of coherent delocalized electrons that exist at the interface between a metal and a dielectric [1,2,3]. The other is a localized surface plasmon (LSP) which can be excited by photons absorbed by nanoparticles with sizes comparable or smaller than the wavelength of the photons Both types of SPs have the same significant effect: the electromagnetic (EM) field is greatly enhanced at the surface where SPs are excited [3,4,5]. MO activities, especially magneto-optical Kerr effect (MOKE) [21], play important role in both categories For the former one, Eq (2) briefly describes how SPs affect the MO activities through the enhanced field: rps ∝ Ep Es d ε mo (2). On the other hand, compared to metal surface second-harmonic generation (SHG) in NP, MSHG contains nonzero magnetic components of the second-order nonlinear susceptibility tensor which makes MSHG extremely sensitive to subtle modifications of the spin-polarized electronic structure of transition metal surfaces [32,33], the same region where SPs are present. The studies are classified according to the types of SPs into two categories: SPP and LSP
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