Speckle fields polarimetry: statistical analysis and polarization singularities measurements.

We propose a polarimetric study of speckle fields either produced by surface or bulk scattering. We decompose these speckle fields on plane waves fully polarized along two orthogonal states of polarization, and a fully depolarized amplitude. After a statistical analysis of the parameters obtained by the decomposition, we focus our attention on places of destructive interference: the optical vortices. These structures are called polarization singularities, the three ones usually studied in speckle fields are described by an half integer index. We point out here experimental detection of integer index polarization singularities, which present an higher order of symmetry. The plane wave decomposition allows us to compare the field relative phase shift between two orthogonal directions around half integer index polarization singularities and integer index ones.