Role of interactions in the magneto-plasmonic response at the geometrical threshold of surface continuity

Abstract

The optical and magneto-optical behavior in periodically nanostructured surfaces at the threshold of surface continuity is revealed. We address Co films that evolve from an island-like array to a connecting network of islands that form a membrane pattern. The analysis of magneto-optical spectra as well as numerical simulations show significant differences between continuous and broken membranes that depend dramatically on the energy of the incoming radiation. Light localization increases the magneto-optical signal in the membranes. However, the generation of hot spots is not accompanied with magneto-optic enhancement. The electromagnetic field profile within the membrane system can explain the differences in the transmission and in the magneto-optic Kerr signal.

Enhanced Resonant Faraday Rotation in Multilayer Magnetoplasmonic Nanohole Arrays and Their Sensing Application

“…The hybridized nanostructure system synthesized by a combination of a ferromagnet and a noble metal to form the so-called magnetoplasmonics system has recently been one of the central ideas for magnetoplasmonics research. − Ferromagnetic metals such as Co, Ni, or Fe exhibit excellent magneto-optical (MO) responses with a relatively low external magnetic field at room temperature. However, they are lossy in visible and near-infrared optical ranges and therefore are rarely used alone in MO devices. , On the other hand, noble metals such as Au or Ag have very low MO response, yet they possess strong plasmonic properties. − In a magnetoplasmonics system, surface plasmon resonance (SPR) can be generated by incident electromagnetic waves, propagate, and sustain for a long time in the noble metal components. , The plasmonic properties can be actively manipulated by ferromagnetic material components due to their large MO responses. , Conversely, the enhanced local electrical field and light–material interaction time induced by SPR of noble metal components can boost the MO responses of the system .…”

All-Optical Manipulation of Magnetization in Ferromagnetic Thin Films Enhanced by Plasmonic Resonances

“…The rapid development of plasmonics over the last two decades has triggered a variety of research areas, such as biochemical sensing, , plasmon-enhanced energy harvesting, , plasmon-induced hot carrier generation, plasmonic metamaterials, magneto-plasmonics, and heat-assisted magnetic recording (HAMR) for data storage. In particular, magneto-plasmonics focus on the enhancement of magneto-optical effect by plasmonic nanostructures, such as nanodisks, − nanoholes, − and gratings. − On the other hand, we can utilize plasmonic nanoantennas, − resonant nanocavities, or solid-immersion superoscillatory lens to enhance the optothermal effect within the magnetic recording medium for HAMR technology. An external magnetic field is then applied to store data within the heated areas.…”

Near-field mechanism of the enhanced broadband magneto-optical activity of hybrid Au loaded Bi:YIG

“…Recently, the correlation of near-and far-field effects of a patterned magnetoplasmonic array has been shown with the aid of Photoemission Electron Microscopy (PEEM), 27 paving the way for tailoring the magneto-optical response of these systems: the spatial distribution of the polarization-and energy-dependent electric near-field of the propagating plasmon polaritons has been connected to the enhancement of the magneto-optical Kerr effect. As a further matter, the nature of the plasmonic resonances (localized or propagating surface plasmons 28,29 ) can alter differently the response of the magneto-optically active material in a magneto-plasmonic structure. From the wider family of the hybrid magneto-plasmonic structures, [14][15][16]25,30,31 the system composed of ferrimagnetic dielectric layers of bismuth-substituted yttrium iron garnet (Bi:YIG) with embedded Au nanoparticles (AuNPs) that support localized plasmon resonances (LPRs), has attracted little attention for its importance.…”