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

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Abstract

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 10kHz, with a 12Hz framerate array detector.

© 2010 Optical Society of America

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