Two-color differential dynamic microscopy for capturing fast dynamics

Differential dynamic microscopy (DDM) is increasingly used in the fields of soft matter physics and biophysics to extract dynamics microscopic objects across a range wavevectors using optical microscopy. Standard DDM limited detecting no faster than camera frame rate. We report on an extension where we sequentially illuminate sample with spectrally-distinct light image color camera. By pulsing blue then red separated by lag time much smaller camera's exposure are able use this two-color method measure occurring