Faculté des sciences

Photonic properties of strongly correlated colloidal liquids

Rojas-Ochoa, Luis Fernando ; Mendez-Alcaraz, J. M. ; Sáenz, J. J. ; Schurtenberger, Peter ; Scheffold, Frank

In: Physical Review Letters, 2004, vol. 93, p. 073903-73906

The optical and structural properties of dense colloidal suspensions in the presence of long-range electrostatic repulsion are determined from both light and small-angle neutron scattering experiments. Short-range structural order induces an enhancement of the scattering strength while at the same time the total transmission shows strong wavelength dependence, reminiscent of a photonic crystal.... Plus

Ajouter à la liste personnelle
    Summary
    The optical and structural properties of dense colloidal suspensions in the presence of long-range electrostatic repulsion are determined from both light and small-angle neutron scattering experiments. Short-range structural order induces an enhancement of the scattering strength while at the same time the total transmission shows strong wavelength dependence, reminiscent of a photonic crystal. Interestingly, the interplay between diffusive scattering and local order leads to negative values of the scattering anisotropy parameter. The tunable optical properties of these liquids furthermore suggest potential applications such as transparency switches or filters.