We present a phase-sensitive near-field study of speckle fields from photonic crystals in the presence of disorder. We observe phase singularities (vortices) and analyze their statistical properties and screening effects. The experimental results show a clear polarization dependence, not only in their morphological parameters but also in their spatial distribution.

Opt. Lett.

Vignolini, S., Burresi, M., Gottardo, S., Kuipers, K., & Wiersma, D. S. (2010). Observation of vortices and field correlations in the near-field speckle of a three-dimensional photonic crystal. Opt. Lett., 35(12), 2001–2003. doi:10.1364/OL.35.002001