Optical and magnetooptical properties of metallic subwavelength gratings onto the surface of uniformly magnetized dielectric substrate were investigated. Special attention was paid to the regions of the Wood's anomalies. Faraday and Kerr were shown to demonstrate resonance behavior at the surface plasmon polaritons wavelengths regions. The possibility of influence on the magnetooptical effects by specially prepared nanostructuring was demonstrated.
Magnetooptical effects in the metal/dielectric heterostructure, consisting of a thin metallic layer with the array of
parallel subwavelength slits and a uniform dielectric layer magnetized perpendicular to its plane, are investigated.
Calculations, based on the rigorous coupled-wave analysis of Maxwell's equations, demonstrate that in such structures
the Faraday and Kerr rotation can be significantly enhanced in the near infrared optical range. It is possible by varying
thickness of the magnetic film to make Faraday rotation and transmittance peaks coincident and achieve the increase in
the Faraday effect by more than an order of magnitude at the transmittance of 40-45%. It is shown that the excitation of
the surface plasmon polaritons and quasi-guided TM- and TE- modes in the dielectric layer mostly governs the
enhancement of the Faraday rotation.
A theoretical approach for the calculation of the bimetallic nanoparticles absorption spectra has been developed as an extension of the Mie theory in which nanoparticle dielectric function is found by the weighted linear combination of the dielectric functions for particles made of the corresponding pure metals. We propose a simple method for the on-line monitoring of the bimetallic nanoparticles composition based on the measurement of the absorption peak position. Elaborated theoretical approach was used to investigate the polymer embedded Ag/Au nanoparticles. Calculated absorption spectra for the Ag/Au nanoscopic systems showed good agreement with the experimental data. Temporal evolution of the Ag/Au nanoparticles size and composition has also been investigated by this approach.
Photonic band-gap structures are of interest both from fundamental and practical points of view. They are known to enhance nonlinear, magnetooptical, electrooptical and other effects in the medium when frequency is near photonic band gap [1, 2]. Second harmonic generation is observed when phase-matching conditions are fulfilled,
i.e. phase velocities of first and second harmonics are equal. Homogeneous media have their own material dispersion, so phase mismatch always presents. Anisotropy in some materials can compensate dispersion in specific directions, and such nonlinear crystals are commonly used in lasers and parametric light generators . Photonic crystals are attractive for practical applications because of a large diversity of their dispersion properties comparing to homogeneous media. Varying photonic crystal parameters, such as lattice period, filling factor and refractive indices of media, one can manipulate
its band structure.
Theoretical analysis of the magnetic photonic crystals optical properties has been performed. Original theoretical approach similar to the adiabatic approximation in the solid state physics is described. Effect of the light polarization rotation is described for the case of three-dimensional photonic crystal with the relation of recent experiments. Magnetooptical Faraday and Voigt effects have been studied near extremum points of photonic bands where their significant enhancement takes place. Several possible applications of the magnetic photonic crystals for the modern optical devices are discussed.