Tb3Sc2Al3O12-TbScO3 eutectic crystallizes in a rodlike microstructure, and its potential to exhibit photonic
bandgap has been presented tentatively. In order to model its optical properties there is a need for precise
determination of the optical properties of its component materials in a wide spectral range. Spectroscopic data
in the range from 0.6 to 6.5 eV (190-2100 nm) were obtained using spectroscopic ellipsometer UVISEL, Horiba
Jobin-Yvon. The measurement was completed with mid infrared reflection data using Bruker FTIR spectrometer
in the spectral range from 7500 to 550 cm-1. Optical functions were obtained using fitting of the data with
model dielectric function fulfilling the Kramers-Kronig dispersion relations. Obtained optical functions enable
to model the optical properties of self-organized eutectic micro- and nanostructures.
Surface optical and magneto-optical properties of as-quenched (AQ)
Co66Fe4Si15B15 amorphous ribbons are studied using
the magneto-optic vector magnetometry. Both in-plane magnetization components (longitudinal ML and transversal MT)
detect typical uniaxial magnetic anisotropy with the easy axis close to the ribbon axis. Moreover, the total magnetization
vector |M|/MS = (ML2)+
Mr2)0.5/MS indicates that coherent rotation of magnetization dominates. In the regions, where |M|/MS < 1, we observe the magnetic domains using the Kerr optical microscope. The fact that domain structure closely
relates with the magnetic anisotropy is confirmed. Surface optical (refractive index) and magneto-optical (the Voight
constant) properties of AQ ribbon are obtained by comparing the measured magneto-optical Kerr angles at different
incident angles with the theoretical model based on the light propagation in layered anisotropic media.
FeNbB amorphous ribbons are promising soft magnetic materials with adjustable surface magnetic properties.
Field-annealing is applied to control nano-crystallized surface magnetic films, which can be monitored
by using magneto-optical techniques. In this paper we analyze depth sensitivity of magneto-optic methods
and investigate the surface magnetic properties of amorphous ribbons. Magneto-optic response and depth
sensitivity is modeled using 4 x 4 matrix formalism of light propagation in anisotropic multilayers. Optical
and magneto-optical properties of near surface nano-crystallized phases differ from those of deeper bulk
material. The complex longitudinal magneto-optic Kerr effect is measured for s- and p-polarized incident
light. Both magneto-optical angles: the Kerr rotation and Kerr ellipticity are analyzed. Separation of
magneto-optic contributions from different layers is obtained using different phase sensitive and penetration
depth of the complex magneto-optic measurements. For these measurements we use magneto-optic vector
magnetometry based on differential intensity between two polarization states.
A new null ellipsometer has been recently proposed that uses photoelastic modulator (PEM). The phase modulation adds a good signal-to-noise ratio, high sensitivity, and linearity near null positions to the traditional high-precision nulling system. The ellipsometric angles Delta and psi are obtained by azimuth measurement of the analyzer and the polarizer--PEM system, for which the first and second harmonics of modulator frequency cross the zeros. In this paper we discuss influence of component imperfection on precision of null measurement. Particular interest is devoted to azimuth angle error of compensator and modulator. Effect of residual birefringence of PEM is discussed. We show that the null system is insensitive to ellipsometer misadjustment and component imperfections and modulator calibration is not needed.
One of the most important problem of modern optical fiber transmission systems is their bandwidth limitation due to polarization mode dispersion. There are a lot of dispersion compensation methods leading to increase of the bandwidth of transmitted signals. One of them is based on application of Faraday phenomenon caused in optical fiber by external magnetic field. In the paper we present results of measurements of polarization parameters of light passing through different kind of optical fibers. One of the polarization parameters named degree of polarization and its changes allows to conclude about polarization mode dispersion. Hence we can utilize our results for design of a magneto-optical system for dynamic polarization mode dispersion compensation.
A general matrix method for description of light reflection and transmission in systems containing of thin and thick anisotropic layers is proposed. The method is based on matrix summation of partial waves. The non-coherent summation of intensities in a thick layer is characterized using the coherence vector formalism. The measured quantities (magneto-optical rotation and ellipicity), or Mueller matrix components are obtained from 4×4 matrix describing transformation between coherence vectors, hereafter the coherence transforming matrix. In the case of polar geometry, the base consists of right and left-handed circular polarizations and the matrices have diagonal form.