Near-field to far-field characterization of speckle patterns generated by disordered nanomaterials
Résumé
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 ≪λ) to the far-field regime (distance ≫λ). The non-universal behavior at sub-wavelength distances reveals the connection between the near-field speckle pattern and the internal structure of the medium.
Domaines
Physique [physics]| Origine | Publication financée par une institution |
|---|