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Opt Lett. 2010 Mar 1;35(5):787-9. doi: 10.1364/OL.35.000787.

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

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Institut Langevin, CNRS UMR 7587, INSERM U 979, Fondation Pierre-Gilles de Gennes, Universit├ęs Paris 6 & 7, ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France.


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.

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