Open AccessResolving high-speed colloidal dynamics beyond detector response time via two pulse speckle contrast correlation
Author(s) -
Sooheyong Lee,
Wonhyuk Jo,
Haeng Sub Wi,
Christian Gutt,
Geun Woo Lee
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.021567
Subject(s) - speckle pattern , optics , detector , microsecond , scattering , temporal resolution , pulse (music) , physics , measure (data warehouse) , light scattering , correlation function (quantum field theory) , computer science , optoelectronics , database , dielectric
We report an alternate light scattering approach to measure intermediate scattering function and structures of colloidal suspension 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.