A. A. Grunin

Surface-plasmon-induced enhancement of magneto-optical Kerr effect in all-nickel subwavelength nanogratings

Enhancement of transversal magneto-optical Kerr effect (TKE) is controlled experimentally in magnetoplasmonic subwavelength nanogratings made of nickel films by resonant excitation of surface plasmon-polaritons (SPPs). Almost one order of magnitude increase of the TKE value is observed in the spectral range of Wood’s anomaly corresponding to the fulfillment of the phase-matching conditions for SPP excitation.

Magnetoplasmonic nanostructures based on nickel inverse opal slabs

Nanostructured nickel surfaces representing periodically arranged spherical voids in a nickel film are obtained by electrochemical deposition through a self-assembled opaline template. Excitation of surface plasmon-polaritons (SPPs) on the surface of the sample is experimentally observed as the Wood’s anomaly in the reflectance spectra. Transversal magneto-optical Kerr effect (TMOKE) spectra are measured at the different angles of incidence and azimuthal angles. The two- to-threefold enhancement of TMOKE caused by the excitation of mixed plasmons in two selected azimuthal configurations is observed.

Magnetic field-controlled femtosecond pulse shaping by magnetoplasmonic crystals

Femtosecond-scale magnetic field-controlled shaping of 200 fs laser pulses reflected from a one-dimensional magnetoplasmonic crystal is experimentally demonstrated. Magnetic field-induced modification of the pulse shape is revealed by measuring the second-order intensity correlation function (CF) of femtosecond pulses reflected from the sample. The sign of the magnetic contribution to the CF is reversed within the pulse. Such temporal shaping of the pulses is attributed to modification of the Fano-type surface plasmon spectral response function under magnetization of the sample in the Voigt configuration.

Transversal magneto-optical Kerr effect in two-dimensional nickel magnetoplasmonic crystals

Resonant transversal magneto-optical Kerr effect (TKE) is experimentally studied in 2D nickel magnetoplasmonic crystal. Gradual transition between collinear and bi-directional types of surface plasmon-polariton phase matching and its influence on TKE resonances are observed by measuring and analyzing dependence of reflectance and TKE spectra on the azimuthal angle.

Magneto-optical response enhancement in 1D and 2D magnetoplasmonic crystals

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.

Self-similarity effects in optical response of fractal photonic quasi-crystals

One-dimensional photonic microstructures with optical thicknesses chosen according to the fractal sequence of the Cantors ladder are considered. Experimental samples made by electrochemical etching of porous silicon are studied. Both numerical calculations and experimental results demonstrate self-similarity in reflection spectrum. Numerical calculations demonstrate self-similarity in space distribution and time-resolved response caused by self-similarity in morphology.

Magnetic and Magneto-Optical Properties of Magnetoplasmonic Crystals

Nano systems with combined magnetic and plasmonic functionalities have become an active topic of research in recent years. By an adequate internal architecture of the constituting components, the magneto-optical activity of these systems can be greatly intensified due to the electromagnetic field enhancement associated with the plasmon resonance. One of such approaches is a creating of magnetoplasmonic crystals (MPlCs) based on the noble and ferromagnetic metals. This work represents results of the investigation of the magneto-optical (MO) properties of the magnetoplasmonic structure, and parameters of the magnetic field sensor based on such structures. Possibility of creation of the magnetic field sensor with different properties is represented.