Tuesday, 30 June 2015, 15:00
Sala Grande Palazzina B via alla Cascata 56/C
Localization transition in a colloidal suspension (TiO2@Silica)
Ernesto Jimenez Villar
Departamento de Quimica Fundamental, Centro de Ciencia Exatas e da Natureza, UFPE,
Instituto de Ciencia Molecular,
In recent years, there has been dramatic progress in the photonics field in disordered media, ranging from applications in solar collectors, photocatalyzers, random lasing, and other novel photonic functions, to investigations into fundamental topics, such as light confinement and other phenomena involving photon interactions. This paper reports several experimental evidences of localization transition and an enhanced absorption effect in a strongly disordered scattering medium composed of a colloidal suspension of core-shell nanoparticles (TiO2@Silica) in ethanol solution. We demonstrate the crossover from a diffusive transport to a localization transition regime as nanoparticles concentration is increased, and that an enhanced absorption effect arises at localization transition.