Yevchik A. The influence of structural defects on the light propagation in photonic crystals

The object of investigation is the anomalies of light propagation in photonic crystals with defects and optical phenomena in matrix nanocomposites based on them. The aim is experimentally to ascertain the influence of defects on the optical phenomena conditioned by anomalies of light propagation in synthetic opals and matrix nanocomposites based on them. Investigation methods are measurement of transmission, reflection, Raman and secondary emission spectra under optical excitation; the method of laser diffraction on the fine structure of synthetic opals; the 1D periodic defective structure modeling by use plane wave expansion and transfer-matrix methods.The classification of synthetic opals structural defects was performed. The method for assessing the samples quality was proposed by introducing the ordering coefficient. A model of one-dimensional periodic dielectric structure with typical defects for synthetic opals was developed. The comparative analysis of the calculated and experimental Bragg reflection spectra showed that the model will be bring more close to real conditions if the multiple light scattering take into account. The studying of secondary emission (fluorescence, Raman, spontaneous parametric light scattering) of nanocomposites based on synthetic opals and optical material allowed to determine the value of the amplification for the intensity of secondary emission. The scope of application is lecture courses, further research in the framework of degree and postgraduate work.