Розглянуто пластинчату хвилепровідну структуру, яка має лівоповоротний матеріал (ЛПМ) як шар, що направляє хвилі. Теоретично досліджено розповсюдження поперечно-магнітних мод в структурі, що використовується для оптичного зондування однорідних середовищ. ЛПМ розташовано між напівнескінченною оптично лінійною підкладкою та напівнескінченним нелінійним покриттям із залежним від інтенсивності за законом Керра показником заломлення. Дослідження в основному спрямовано на визначення чутливості запропонованого оптичного сенсора для надання розробникам даних щодо оптимальної структури сенсора, що забезпечує максимальну чутливість.

Dye-sensitized solar cells (DSSCs) were assembled using Zinc oxide (ZnO) nanoparticles as a photoelectrode and natural dyes extracted from eight natural plants as photosensitizers. The structural properties of the synthesized ZnO nanoparticles were studied using XRD, SEM and TEM characterizations. Photovoltaic parameters such as short circuit current density J_sc, open circuit voltage V_oc, fill factor FF, and overall conversion efficiency η for the fabricated cells were determined under 100 mW/cm² illumination. It was found, that the DSSC fabricated with the extracted safflower dye as a sensitizer showed the best performance. Also, its performance increased with increasing the sintering temperature of the semiconductor C. Moreover, it was found that a semiconductor electrode ofіelectrode with highest performance at 400 °C thickness yielded the highest response 7,5 mu m.

A four-layer slab waveguide structure with a lossy left-handed material (LHM) core layer is investigated as a surface sensor for detection any change in an adlayer thickness and refractive index. The sensitivities of the effective refractive index to any change in the refractive index/thickness of the adlayer are derived and studied with the parameters of the LHM. It is found that a slight change in the real parts of the permittivity and permeability of the LHM can significantly improve the sensitivity of the proposed sensor.

In this work, three extracts of plant leaves were used as sensitizers for dye-sensitized solar cells (DSSCs). These plants are Safflower, Medicago sativa and Ros marinus oficinalis. The natural dyes were extracted before and after grinding the plant leaves. The UV-YTS absorption spectra of the three extracts in ethyl alcohol solution were measured. The DSSCs were assembled using TiOi films on Fluorine-doped tin oxide (FTO) coated glass. The DSSCs sensitized with the extracts of grinded leaves showed a better performance compared to those sensitized with un-grmded leaves with the highest efficiency of 0,115 % was obtained for the DSSC sensitized with Medicago sativa. The performance of the DSSCs sensitized with Safflower and Ros marinus oficinalis was significantly improved by acid treatment of the FTO substrates. Impedance spectroscopy of the fabricated cells was also carried out.

A group of chemical sensitizers of two hydrazonoyl based derivatives were synthesized. These derivatives contain a good <$Epi> system for efficient light absorption and oxide sensitization. Precursor structure I was reacted with 2,6-diaminopyridine, 2-aminobenzoic acid, 1-aminobenzoic acid, 2-aminopyridine, 2,6-dinitrophenylhydrazine, and diphenylamine. The other precursor, structure (II), was reacted with 2-aminobenzoic acid, 2-amino-3-methyl, and 2-amino-4-methylpyridine. A total of 9 dyes were prepared and evaluated as sensitizers for dye-sensitized solar cells (DSSCs). Full computational calculations using DFT B3LYP 6-31+G were carried out for evaluation of band edge and band gap energies of all compounds. The absorption spectra of these dyes as well as cyclic voltammetry were used for the measurement of the HOMO, LUMO, and energy band gaps. The photovoltaic performance of the fabricated DSSCs was measured in different solutions comprising water, alcohol, phenylhydrazine, and dinitrophenylhydazine.