Surface plasmon driven enhancement of linear and nonlinear magneto-optical Kerr effects in bimetallic magnetoplasmonic crystals in conical diffraction (original) (raw)
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Extraordinary Magnetooptics in Plasmonic Crystals
2010
Plasmonics has been attracting considerable interest as it allows localization of light at nanoscale dimensions. A breakthrough in integrated nanophotonics can be obtained by fabricating plasmonic functional materials. Such systems may show a rich variety of novel phenomena and also have huge application potential. In particular magnetooptical materials are appealing as they may provide ultrafast control of laser light and surface plasmons via an external magnetic field. Here we demonstrate a new magnetooptical material: a one-dimensional plasmonic crystal formed by a periodically perforated noble metal film on top of a ferromagnetic dielectric film. It provides giant Faraday and Kerr effects as proved by the observation of enhancement of the transverse Kerr effect near Ebbesen's extraordinary transmission peaks by three orders of magnitude. Surface plasmon polaritons play a decisive role in this enhancement, as the Kerr effect depends sensitively on their properties. The plasmonic crystal can be operated in transmission, so that it may be implemented in devices for telecommunication, plasmonic circuitry, magnetic field sensing and all-optical magnetic data storage.
Magneto-optical response enhancement in 1D and 2D magnetoplasmonic crystals
2009
The results of experimental observation of magneto-optical Kerr effect (MOKE) enhancement caused by surface plasmon-polaritons (SPP) excitation in 1D and 2D magnetoplasmonic crystals are presented. One-dimensional nickel magnetoplasmonic crystals have periodic structure formed by periodic nickel grooves made on nickel surface. The period of the structure is 320 nm and the depth of the grooves is 50 nm. The second group of the samples represents itself a 2D self-assembled hexagonally ordered monolayer of polystyrene (PS) microspheres with diameters from 500 to 760 nm and covered by 100- nm - thick nickel film. MOKE measurements performed in transversal configuration demonstrate that SPP excitation lead to transversal Kerr effect (TKE) enhancement resulting as a sharp peak in TKE spectrum.
Enhanced magneto-optical effects in magnetoplasmonic crystals
Nature Nanotechnology, 2011
Plasmonics allows light to be localized on length scales much shorter than its wavelength, which makes it possible to integrate photonics and electronics on the nanoscale. Magneto-optical materials are appealing for applications in plasmonics because they open up the possibility of using external magnetic fields in plasmonic devices. Here, we fabricate a new magneto-optical material, a magnetoplasmonic crystal, that consists of a nanostructured noble-metal film on top of a ferromagnetic dielectric, and we demonstrate an enhanced Kerr effect with this material. Such magnetoplasmonic crystals could have applications in telecommunications, magnetic field sensing and all-optical magnetic data storage. S urface plasmon polaritons (SPPs)-coupled oscillations of the electromagnetic field and the electron plasma in a metal-have an important role in plasmonics 1-5 because they allow electromagnetic energy to be concentrated in nanoscale volumes near metal/dielectric interfaces, which leads to the enhancement of Raman scattering 6,7 and other nonlinear optical effects. Including a magnetic material in a plasmonic structure would provide another means of control over the plasmons and the light in the device through magneto-optical effects 8 such as the Faraday effect (rotation of the polarization of transmitted light) and the Kerr effect (rotation of the polarization of reflected light). In particular, if the applied magnetic field is perpendicular to the plane of incidence of the light, the transverse magnetooptical Kerr effect (TMOKE) leads to a change in the intensity of the reflected light 8 .
ACS omega, 2017
We propose a highly sensitive sensor based on enhancing the transversal magneto-optical Kerr effect (TMOKE) through excitation of surface plasmon resonances in a novel and simple architecture, which consists of a metal grating on a metal magneto-optical layer. Detection of the change in the refractive index of the analyte medium is made by monitoring the angular shift of the Fano-like resonances associated with TMOKE. A higher resolution is obtained with this technique than with reflectance curves. The key aspect of the novel architecture is to achieve excitation of surface plasmon resonances mainly localized at the sensing layer, where interaction with the analyte occurs. This led to a high sensitivity, = 190° RIU, and high performance with a figure of merit of the order of 10, which can be exploited in sensors and biosensors.
Journal of the Optical Society of America B, 2009
We predict a significant enhancement of the magneto-optical transverse Kerr effect when a smooth magnetic dielectric film is covered with a thin noble metal layer perforated with subwavelength slit arrays. The relative intensity change can be as large as 50%. The Kerr effect increase is due to the magnetization-induced change of the phase velocity of the resonantly excited surface plasmons. It can be used as an efficient tool for surface plasmons detection.
Intensity magnetooptical effect in magnetoplasmonic crystals
Journal of Physics: Conference Series, 2011
Significant increase of the intensity magnetooptical effect (transversal Kerr effect) is observed in transmission for a magnetoplasmonic crystal consisting of the perforated noblemetal film attached to a smooth magnetic dielectric layer. It is largely due to the magnetic field induced shift of the Fano resonances in transmission associated with the surface plasmon polaritons excited at the metal/magnetic-dielectric interface. It is shown that the quasi-guided modes of the magnetic layer also lead to the enhancement of the intensity magnetooptical effect. The considered magnetoplasmonic structures are of great importance for applications in telecommunication and molecular sensing as they also drastically enhance other magnetooptical effects.
Optics express, 2014
Magnetoplasmonic crystals (MPC) composed of a 1D gold grating on top of a magnetic garnet layer made by a combined ion-beam etching technique are studied. We demonstrate that this method allows to make high-quality MPC. It is shown that MPC with a 30-40 nm thick perforated gold layer provides an effective excitation of two surface plasmon-polariton modes and several numbers of waveguide modes in the garnet layer. An enhancement of the transversal magneto-optical effect up to the value of 10(-2) is observed for all types of resonant modes, that propagate in the magnetic layer, due to magnetic-field control over the mode excitation which is promising for future photonic devices.
Surface profile-tailored magneto-optics in magnetoplasmonic crystals
APL Photonics, 2022
The control of transverse magneto-optical Kerr effect (TMOKE) enhancement is realized by balancing the radiative and absorption losses in one-dimensional all-nickel magnetoplasmonic crystals. The modulation of the surface shape tunes the plasmonic radiative losses and coupling of the incident light with surface plasmons. The maximal magneto-optical response corresponds to the optimal coupling implemented with the equality of radiative and absorption losses. A slight deviation from the optimal corrugation depth results in a significant reduction of the TMOKE value.
Extraordinary Magneto-Optical Effects and Transmission through Metal-Dielectric Plasmonic Systems
Physical Review Letters, 2007
We report on significant enhancement of the magnetooptical effects in gyrotropic systems of a metallic film perforated by subwavelength hole arrays and a uniform dielectric film magnetized perpendicular to its plane. Calculations, based on a rigorous coupled-wave analysis, demonstrate the Faraday and Kerr effect spectra having several resonance peaks in the near infrared range, some of them coinciding with transmittance peaks. Qualitative analysis revealed that magnetic polaritons being coupled magnetic-film waveguiding modes with surface plasmons play a crucial role in the observed effect.