Parallel heterodyne detection of dynamic light scattering spectra from gold nanoparticles diffusing in viscous fluids.

Michael Atlan (1) , Pierre Desbiolles (2) , Michel Gross (2) , Maite Coppey-Moisan (3)

1 IL - Institut Langevin - Ondes et Images (UMR7587)
2 LKB (Lhomond) - Laboratoire Kastler Brossel
3 IJM (UMR_7592) - Institut Jacques Monod

We developed a microscope intended to probe, using a parallel heterodyne receiver, the fluctuation spectrum of light quasi-elastically scattered by gold nanoparticles diffusing in viscous fluids. The cutoff frequencies of the recorded spectra scale up linearly with those expected from single scattering formalism in a wide range of dynamic viscosities (1 to 15 times water viscosity at room temperature). Our scheme enables ensemble-averaged optical fluctuations measurements over multispeckle recordings in low light, at temporal frequencies up to 10 kHz, with a 12 Hz framerate array detector.

Domaines: Optique [physics.optics]

Michael Atlan, Pierre Desbiolles, Michel Gross, Maite Coppey-Moisan. Parallel heterodyne detection of dynamic light scattering spectra from gold nanoparticles diffusing in viscous fluids.. Optics Letters, 2010, 35 (5), pp.787-789. ⟨10.1364/OL.35.000787⟩. ⟨hal-00463656⟩