Observation of vortices and field correlations in the near-field speckle of a three-dimensional photonic crystal
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.
Vignolini, S, Burresi, M, Gottardo, S, Kuipers, L, & 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