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We perform a comparative study of the Anderson localization of light beams indisordered layered photonic nanostructures that, in the limit of periodic layerdistribution, possess either a Dirac point or a Bragg gap in the spectrum ofthe wavevectors. In particular, we demonstrate that the localization length ofthe Anderson modes increases when the width of the Bragg gap decreases, suchthat in the vanishingly small bandgap limit, namely when a Dirac point isformed, even extremely high levels of disorders are unable to localize theoptical modes located near the Dirac point. A comparative analysis of the keyfeatures of the propagation of Anderson modes formed in the Bragg gap or nearthe Dirac point is also presented. Our findings could provide valuableguidelines in assessing the influence of structural disorder on thefunctionality of a broad array of optical nanodevices.

Transverse Anderson localization of light near Dirac points of photonic nanostructures