Copper-containing nanoparticles synthesized in high-pressure polyethylene matrix by the method of thermal decomposition
of (CH3COO)2Cu H2O are presented. Average dimensions of nanoparticles and size distribution were determined by
transmission electron microscopy and X-ray phase analysis. It was shown that, with increasing copper concentration, the
nanoparticles increase in size from 6 to 18 nm. The structure of copper-containing nanoparticles was determined by the
method of EXAFS spectroscopy in fluorescence mode and in transmission one. It was shown that the samples containing 3
wt% and 5 wt% of copper are most likely to include CuO particles with tenorite structure. When the copper concentration is
increased to 10 wt%, the nanoparticles contain Cu2O and metallic copper phases. An increase in copper concentration to 40
wt% results in complication of the composition and the structure of the particles.
New optical medium consists of CdS nano particles (NPs) in a matrix of a low density polyethylene (LDP). It is shown, that the structure and optical properties of NPs depend on both concentration and NPs size in a matrix. For CdS NPs the average size of particles has made from 4,5 to 7 nanometers for concentration from 10 wt. % to 40 wt. % correspondingly. The optical reflectance and absorption spectra of nanocomposite materials were measured at room temperature in the visible and near-infrared regions. It is shown that, with an increase in the NPs concentration in the dielectric matrix the absorption coefficient rises mainly. Whereas an increase in the NPs size only for fixed concentration has effect on the set of optical medium parameters such as spectral position of absorption maximum and so on.
Bragg diffraction of optical waves has been analyzed for an isotropic elastic optical medium (EOM) on hypersonic waves (HSW) excited by zero and minus-first space harmonics of slow electromagnetic waves in the MW band which propagate in a periodic structure placed at the medium boundary. The simple analytical relations for calculation of frequency- response characteristics (FRC) are obtained for acousto- optical interaction in such media.
The main concepts of optical wave propagation in periodic structures are reviewed. A new method, named as `method of long lines' in optic calculations, is proposed. This method may be successfully employed to calculate either static or dynamic periodic structures with complex refraction index. Variation of wave interaction in dynamic periodic structures (acoustooptic interaction, scattering at metal- semiconductor-metal interface) is also given adequate consideration.
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