Berlin 2015 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 45: P10: Colloids and Complex Liquids
CPP 45.6: Poster
Wednesday, March 18, 2015, 10:00–13:00, Poster A
Resolving high-speed colloidal dynamics beyond detector response time via two-pulse speckle contrast correlation — •Sooheyoung Lee1, Wonhyuk Jo1,2, Hengsub Wi1, Christian Gutt3, Jan Verwohlt3, and Geunwoo Lee1 — 1Korea Research Institute of Standards and Science, Daejeon, Republic of Korea — 2Department of Physics, Soongsil University, Seoul, Republic of Korea — 3Department Physik, Universität Siegen, Germany
We report an alternate light scattering approach to measure the intermediate scattering function and structures of colloidal suspensions by using two-pulse speckle contrast correlation analysis. By systematically controlling time-delays between two laser pulses incident on the sample, we are able to monitor transient evolution of coherent diffraction pattern, from which particle dynamics at different length and time scales are obtained simultaneously. Our result demonstrates the feasibility of utilizing a megapixel detector to achieve sufficient data statistics in a short amount of time while enabling microsecond time-resolution. Ultimately, this method provides means to measure high-speed dynamics well beyond the time response limit of a large area two-dimensional (2D) detector.