Parallel heterodyne detection of dynamic light-scattering spectra from gold nanoparticles diffusing in viscous fluids.
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.
Atlan
Michael
M
Institut Langevin, CNRS UMR 7587, INSERM U 979, Fondation Pierre-Gilles de Gennes, Universités Paris 6 & 7, ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France. altan@optique.espci.fr
Desbiolles
Pierre
P
Gross
Michel
M
Coppey-Moisan
Maïté
M
D004867:Equipment Design; D019544:Equipment Failure Analysis; D006046:Gold / Q000737:chemistry*; D008027:Light; D008853:Microscopy / Q000295:instrumentation*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009391:Nephelometry and Turbidimetry / Q000295:instrumentation*; D012542:Scattering, Radiation; D012996:Solutions / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D014783:Viscosity
D012996:Solutions; D006046:Gold