Near-field to far-field characterization of speckle patterns generated   by disordered nanomaterials
  We study the intensity spatial correlation function of optical speckle patterns above a disordered dielectric medium in the multiple scattering regime. The intensity distributions are recorded by scanning near-field optical microscopy (SNOM) with sub-wavelength spatial resolution at variable distances from the surface in a range which spans continuously from the near-field (distance $ \ll \lambda $) to the far-field regime (distance $\gg \lambda $). The non-universal behavior at sub-wavelength distances reveals the connection between the near-field speckle pattern and the internal structure of the medium. 
Valentina Parigi, Elodie Perros, Guillaume Binard, C\'eline   Bourdillon, Agn\`es Ma\^itre, R\'emi Carminati, Valentina Krac...
physics.optics