Abstract

Photonic crystals are used to modify the properties of light propagation by introducing photonic band-gaps in radiation spectra (i.e. converting light conductors into insulators) also by modification of the dispersion of the light, (i.e. significantly reducing the group velocity). Recently it become apparent that the periodically in space modulated materials can also modify the diffraction of the light, e.g. that diffraction can become negative, At the crossover point between positive and negative diffraction the zero diffraction point can be expected, giving rise to the effect of self-collimation [1].

© 2007 IEEE