Electromagnetic waves propagation in photonic crystals

Recently photonic crystals with a three - dimensional ordered structure with periodicity of the optical wavelength have attracted attention from both fundamental and practical points of view. Control of electromagnetic waves flow in photonic crystals was discussed. The application of photonic crystals is to create tunable band gap materials especially in visible spectra region, where the gap could be controlled by an external parameter. Opal crystal films have been fabricated on solid substrates with a horizontal deposition method. We have studied transmission spectra of synthetic opal, infiltrated with nematic liquid crystal 5CB and demonstrating that the position of the stop band in the visible spectra is shifted to IR wavelength with increasing volume part of 5CB in photonic crystal opal. We show dependence upon stop band position and light incidence angle in bare opal. It is a possibility turning this stop band. Opal filled with LC photonic strength was studied. We demonstrating that photonic strength saturates when was filled about 20% of opal voids.Švietimo akademijaVytauto Didžiojo universiteta