Elanskaia Kristina

Scopus Publications

Optimization of geometry of two-dimensional photonic crystal waveguide for telecommunications and sensorics
K G Elanskaia, А. И. Сидоров
Scientific and Technical Journal of Information Technologies Mechanics and Optics, 2024
The results of geometry optimization of the two-dimensional photonic crystal waveguide for minimization of optical losses and stabilization of waveguide modes are presented. The main factor (not including absorption) is the appearance of Bragg reflection. Bragg reflection can be decreased by the decrease of the regions of overlaps with high refractive index in photonic crystal. For this purpose, the holes in photonic crystal can be fabricated not as the whole holes but as the parts of the holes. For waveguide modes stabilization the varying of waveguide width was performed. Computer simulation was performed in Comsol Multiphisics 5.5. Energy zone structure of photonic crystal surrounding waveguide was computed by Bloch functions method. In modeling, the free-triangle grid with quality “extremely fine” was used. The frequency near which eigenvalues were looked for has range of 190–200 THz. For the solving of the problems procedures ARPACK FORTRAN were used which work on base of iteration of Arnoldi (IRAM). Modeling have shown that the used geometrical optimization makes possible to decrease the Bragg reflection by 1.75 times. It was established that the losses of photon crystal waveguide in this case do not exceed 0.4 dB/cm. It was shown that the the decrease in the photonic crystal holes diameter with a constant period of the photonic crystal lattice leads to a decrease in the width of the photonic forbidden bandgap. It was shown also that in the waveguide with optimum width the modulation of waveguide mode is maintained but its amplitude decreases significantly. The obtained results can be used in the development of integrated-optical devices for telecommunications and sensorics with low optical losses.
Study of nanoscale metal oxide coatings produced by magnetron sputtering of copper followed by heat treatment
I N Kashkul, L D Bakhchova, K G Elanskaia, D N Redka
Iop Conference Series Materials Science and Engineering, 2018
The composition and microstructure of nanoscale metal oxide coatings deposited by magnetron RF sputtering copper on the quartz glass with followed heat treatment were investigated. The dependence of the film thickness and the content of oxides CuO and Cu2O in it depending on the temperature and time of heat treatment conditions were obtained. Studies have shown that, depending on the mode of receipt of copper oxide films may be multiphasic and include various oxide phases, predominantly, CuO and Cu2O with different bandgap and p-type conductivity.
The properties of ZnO films obtained by high-frequency magnetron deposition with subsequent vacuum annealing and plasma treatment
D N Redka, K G Elanskaia, L D Bakhchova
Journal of Physics Conference Series, 2017
The method of high-frequency magnetron sputtering allows to obtain thin films of zinc oxide with nanostructured surface morphology and, consequently, with unique optical characteristics. Such coating can provide an increase in the number of particles penetrating the photovoltaic structure and the length of their optical path. Vacuum-plasma processing of ZnO films allows to change the morphology of their surface, and annealing largely influences the optical transmission.