@article{Zegadlo_Karpierz_2013, title={Optical bifurcations in media with the Kerr nonlinearity}, volume={5}, url={https://www.photonics.pl/PLP/index.php/letters/article/view/5-29}, DOI={10.4302/photon. lett. pl.v5i2.409}, abstractNote={Spontaneous symmetry breaking phenomenon or optical bifurcation occurs in media with some kind of symmetry when self-focusing nonlinearity is applied. In this manuscript that effect is investigated for the Kerr nonlinearity in structures with periodical distribution of refractive index. Not only symmetry bifurcation of the fundamental mode but also properties of a beam propagating in such structures has been studied. Spontaneous symmetry breaking has been presented both as a function of total beam power and as a function of relative refractive index change. 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